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  Subjects -> ENGINEERING (Total: 2312 journals)
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ENGINEERING (1213 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Process Systems Engineering     Full-text available via subscription   (Followers: 2)
Process Technology Proceedings     Full-text available via subscription  
Processes     Open Access  
Production     Open Access  
Production and Operations Management     Hybrid Journal   (Followers: 16)
Production Engineering     Hybrid Journal   (Followers: 5)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 11)
Progress in Agricultural Engineering Sciences     Full-text available via subscription  
Progress in Computational Fluid Dynamics, An International Journal     Hybrid Journal   (Followers: 7)
Progress in Energy and Combustion Science     Full-text available via subscription   (Followers: 10)
Progress in Nanotechnology and Nanomaterials     Open Access   (Followers: 4)
Progress in Photovoltaics: Research & Applications     Hybrid Journal   (Followers: 6)
Progress in Polymer Science     Full-text available via subscription   (Followers: 35)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 314)
Propulsion and Power Research     Open Access   (Followers: 27)
Puente     Open Access  
Purinergic Signalling     Hybrid Journal   (Followers: 1)
Quaderns d’Història de l’Enginyeria     Open Access  
Quality and Reliability Engineering International     Hybrid Journal   (Followers: 14)
Quality Engineering     Hybrid Journal   (Followers: 9)
Radiochimica Acta     Hybrid Journal   (Followers: 5)
Rapid Prototyping Journal     Hybrid Journal   (Followers: 4)
Rare Metals     Hybrid Journal   (Followers: 2)
Reactive and Functional Polymers     Hybrid Journal   (Followers: 5)
Recent Patents on Engineering     Hybrid Journal   (Followers: 3)
Recent Patents on Nanotechnology     Hybrid Journal   (Followers: 2)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Redes de Ingeniería     Open Access  
Regional Maritime University Journal     Full-text available via subscription   (Followers: 2)
Regular and Chaotic Dynamics     Hybrid Journal  
Rekayasa     Open Access  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 49)
Remote Sensing Letters     Hybrid Journal   (Followers: 42)
Requirements Engineering     Hybrid Journal   (Followers: 3)
Research Ideas and Outcomes     Open Access  
Research in Engineering Design     Hybrid Journal   (Followers: 11)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 19)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 29)
Reviews in Advanced Sciences and Engineering     Partially Free   (Followers: 2)
Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica     Open Access  
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1)
Revista Ciencias e Ingeniería al Día     Open Access  
Revista de Engenharia da Universidade Católica de Petrópolis     Open Access  
Revista de Ingeniería     Open Access  
Revista de Ingenieria Sismica     Open Access  
Revista de Investigación, Desarrollo e Innovación     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista Facultad de Ingeniería     Open Access   (Followers: 1)
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1)
Revista Fatec Zona Sul : REFAS     Open Access  
Revista Iberoamericana de Automática e Informática Industrial RIAI     Open Access  
Revista Informador Técnico     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1)
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería     Open Access   (Followers: 1)
Revista Logos Ciencia & Tecnología     Open Access   (Followers: 1)
Revue de Métallurgie     Full-text available via subscription  
RUDN Journal of Engineering Researches     Open Access  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 24)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 9)
Safety Science     Hybrid Journal   (Followers: 35)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 3)
Science & Technique     Open Access  
Science and Education : Scientific Publication of BMSTU     Open Access  
Science and Engineering Ethics     Hybrid Journal   (Followers: 9)
Science and Technology     Open Access   (Followers: 2)
Science and Technology Indonesia     Open Access  
Science China Technological Sciences     Hybrid Journal  
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 3)
Scientia cum Industria     Open Access  
Scientific Drilling     Open Access  
Scientific Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Sealing Technology     Full-text available via subscription   (Followers: 1)
Securitas Vialis     Hybrid Journal  
Security and Communication Networks     Hybrid Journal   (Followers: 3)
Selcuk University Journal of Engineering, Science and Technology     Open Access   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 51)
Semiconductors     Hybrid Journal   (Followers: 1)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Sensor Letters     Full-text available via subscription   (Followers: 2)
Sensors     Open Access   (Followers: 20)
Separation and Purification Technology     Hybrid Journal   (Followers: 11)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Shock and Vibration     Hybrid Journal   (Followers: 13)
SIAM Journal on Applied Dynamical Systems     Hybrid Journal   (Followers: 2)
SIAM Journal on Mathematical Analysis     Hybrid Journal   (Followers: 3)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 1)
SIAM Journal on Numerical Analysis     Hybrid Journal   (Followers: 5)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 8)
SIAM Review     Hybrid Journal   (Followers: 6)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 2)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 6)
Small     Hybrid Journal   (Followers: 10)
Smart Grid     Open Access   (Followers: 1)
Soft Computing     Hybrid Journal   (Followers: 8)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 71)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 16)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 12)
SourceOCDE Developpement urbain, rural et regional     Full-text available via subscription   (Followers: 1)
SourceOCDE Energie     Full-text available via subscription  
SourceOECD Energy     Full-text available via subscription  
SourceOECD Science and Technology Statistics - SourceOCDE Base de donnees des sciences et de la technologie     Full-text available via subscription  
SourceOECD Transport     Full-text available via subscription   (Followers: 3)
SourceOECD Urban, Rural and Regional Development     Full-text available via subscription   (Followers: 1)
South African Computer Journal     Full-text available via subscription  
South African Journal of Agricultural Extension     Open Access   (Followers: 4)
South African Journal of Science     Open Access   (Followers: 5)
Sports Engineering     Hybrid Journal   (Followers: 2)
Stahlbau     Hybrid Journal   (Followers: 3)
Steel in Translation     Hybrid Journal  
Steel Research International     Hybrid Journal   (Followers: 25)
Stochastic Analysis and Applications     Hybrid Journal   (Followers: 2)
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 5)
Stochastics and Dynamics     Hybrid Journal  
Strain     Hybrid Journal   (Followers: 2)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Studies in Engineering and Technology     Open Access  
Studies in Interface Science     Full-text available via subscription   (Followers: 1)
Studies in Logic and Practical Reasoning     Full-text available via subscription  
Studies in Surface Science and Catalysis     Full-text available via subscription   (Followers: 1)
Sud-Sciences et Technologies     Open Access  
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 20)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 1)
Surveys in Operations Research and Management Science     Hybrid Journal   (Followers: 4)
Sustainability Science     Hybrid Journal   (Followers: 9)
Sustainability Science and Engineering     Full-text available via subscription   (Followers: 4)
Sustainable Management of Sediment Resources     Full-text available via subscription  
Swiss Journal of Geosciences     Hybrid Journal   (Followers: 1)
Symmetry     Open Access  
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription   (Followers: 3)
Synthesis Lectures on Antennas     Full-text available via subscription   (Followers: 6)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 5)
Synthesis Lectures on Energy and the Environment: Technology, Science, and Society     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Engineering     Full-text available via subscription  
Synthesis Lectures on Global Engineering     Full-text available via subscription  
Synthesis Lectures on Professionalism and Career Advancement for Scientists and Engineers     Full-text available via subscription   (Followers: 2)
Synthetic Metals     Hybrid Journal   (Followers: 4)
Systems Engineering     Hybrid Journal   (Followers: 6)
Systems Engineering - Theory & Practice     Full-text available via subscription  
Systems Engineering Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 7)
Technical Tips Online     Full-text available via subscription   (Followers: 1)
Technological Engineering     Open Access  
Technologies     Open Access   (Followers: 1)
TECHNOLOGY     Hybrid Journal  
Technology and Innovation     Full-text available via subscription   (Followers: 3)
Technology in Society     Hybrid Journal   (Followers: 4)
Technometrics     Full-text available via subscription   (Followers: 6)
Tecnologia, Ciencia, Educacion     Open Access   (Followers: 1)
Tecnura     Open Access  
Telecommunications Policy     Hybrid Journal   (Followers: 36)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Textile Science and Technology     Full-text available via subscription   (Followers: 4)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 15)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 5)
Thermal Engineering     Hybrid Journal   (Followers: 9)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 3)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 66)
TRANSACTIONS of the VŠB - Technical University of Ostrava, Safety Engineering Series     Open Access   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Transport and Telecommunication Journal     Open Access   (Followers: 4)
Transport World Africa     Full-text available via subscription   (Followers: 3)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 34)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 5)
Trends in Applied Sciences Research     Open Access   (Followers: 1)
Tribology in Industry     Open Access   (Followers: 2)
Tribology International     Hybrid Journal   (Followers: 44)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 34)
Ultramicroscopy     Hybrid Journal   (Followers: 3)
Uludağ University Journal of The Faculty of Engineering     Open Access  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Universal Journal of Engineering Science     Open Access   (Followers: 1)
Utilities Policy     Hybrid Journal   (Followers: 2)
Vacuum     Hybrid Journal   (Followers: 12)
Vibration     Open Access  
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 4)
Visualization in Engineering     Open Access   (Followers: 1)
Walailak Journal of Science and Technology     Open Access  
Waste and Biomass Valorization     Hybrid Journal   (Followers: 2)
Waste Management Series     Full-text available via subscription   (Followers: 2)

  First | 1 2 3 4 5 6 7 | Last

Journal Cover Ionics
  [SJR: 0.486]   [H-I: 36]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1862-0760 - ISSN (Online) 0947-7047
   Published by Springer-Verlag Homepage  [2355 journals]
  • Novel silicon nanowire film on copper foil as high performance anode for
           lithium-ion batteries
    • Authors: Xin Wang; Lanyan Huang; Yongguang Zhang; Fuxing Yin; Zhumabay Bakenov; Nurzhan Umirov; Mingliang Jin; Guofu Zhou
      Pages: 373 - 378
      Abstract: A novel silicon nanowire film anode was successfully prepared by a combination of magnetron sputtering deposition and metal-catalyzed electroless etching technology. Scanning electron microscopy revealed the formation of a Si film composed of nanowires with a diameter of ~70 nm and lengths of ~3.5 μm. As-prepared Si nanowire film is directly grown on current collectors without binders and carbon additives, which provides a good contact and adhesion of them to current collector. Furthermore, the defined spacing of nanoscale Si nanowire allows Si to undergo large volume change during the alloying/dealloying process without loss of its integrity. These structural features of the resulting Si nanowire make it a promising anode for lithium-ion batteries with remarkably improved electrochemical performance compared with the Si film-based electrode prepared without metal-catalyzed electroless etching process.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2219-2
      Issue No: Vol. 24, No. 2 (2018)
  • Preparation and electrochemical properties of Li 4 Ti 5 O 12 /Ti 4 O 7
           composite for lithium-ion batteries
    • Authors: Xiaoyan Zhang; Xiaoxi Zhong; Wen Xu; Xing Li; Wanying Liu; Yuanhua Lin
      Pages: 379 - 384
      Abstract: In order to improve the rate capability of Li4Ti5O12, Ti4O7 powder was successfully fabricated by improved hydrogen reduction method, then a dual-phase composite Li4Ti5O12/Ti4O7 has been synthesized as anode material for lithium-ion batteries. It is found that the Li4Ti5O12/Ti4O7 composite shows higher reversible capacity and better rate capability compared to Li4Ti5O12. According to the charge-discharge tests, the Li4Ti5O12/Ti4O7 composite exhibits excellent rate capability of 172.3 mAh g−1 at 0.2 C, which is close to the theoretical value of the spinel Li4Ti5O12. More impressively, the reversible capacity of Li4Ti5O12/Ti4O7 composite is 103.1 mAh g−1 at the current density of 20 C after 100th cycles, and it maintains 84.8% of the initial discharge capacity, whereas that of the bare spinel Li4Ti5O12 is only 22.3 mAh g−1 with a capacity retention of 31.1%. The results indicate that Li4Ti5O12/Ti4O7 composite could be a promising anode material with relative high capacity and good rate capability for lithium-ion batteries.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2207-6
      Issue No: Vol. 24, No. 2 (2018)
  • Synthesis and electrochemical performance of Li 3 V 2 (PO 4 ) 3 /C by
           organic solvent replacement drying method
    • Authors: Xiushan Yang; Yan Tang; Yanjun Zhong; Benhe Zhong; Xiaodong Guo; Zhuo Zheng
      Pages: 385 - 391
      Abstract: A series of Li3V2(PO4)3/C composite cathodes have been prepared by the organic solvent replacement drying method. Five kinds of organic solvent including ethyl alcohol, butyl alcohol, 2-methoxyethanol, 1,2-propylene glycol, and ethylene glycol were used in the drying process to replace the water respectively. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge tests were employed to analyze the crystal structure, morphology, and electrochemical properties of the as-prepared materials. The results show that the organic solvent has a great influence on the secondary particle size of the as-synthesized materials. Special emphasis is placed on the sample prepared with 1,2-propylene glycol, which has the smallest average particle size and uniform distribution, thus leading to the best high rate performance and long-term cycling stability. The electrode exhibits average specific discharge capacities of 127.6, 128.3, 127.7, 126.7, 125.5, 124.4, 121.9, and 117.0 mAh g−1 at 0.1, 0.2, 0.5, 1, 3, 5, 10, and 20C, respectively. More encouragingly, this sample delivers an outstanding cycle life with capacity retention of up to 94.68% even after 1000 cycles at 20C. Moreover, EIS results demonstrate that this sample has the minimum resistance and the largest apparent lithium ion diffusion coefficient (1.569 × 10−7 cm2 s−1) which can facilitate to the Li+ diffusion during the charge/discharge process. Our results indicate that this preparation strategy can be facile and versatile for the synthesis of other high-rate and high-capacity intercalation materials.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2211-x
      Issue No: Vol. 24, No. 2 (2018)
  • The effects of copper and titanium co-substitution on LiNi 0.6 Co 0.15 Mn
           0.25 O 2 for lithium ion batteries
    • Authors: Enshan Han; Xingjiao Du; Pengjun Yang; Yanjing Han
      Pages: 393 - 401
      Abstract: The Li(Ni0.6Co0.15Mn0.25)1−x (CuTi) x O2 (x = 0.00, 0.01, 0.02, 0.03) cathode materials were synthesized via a hydroxide co-precipitation method followed by a solid-state reaction. The elementary composition, crystal structure features, morphology, and electrochemical performances of the powders were investigated in detail by inductively coupled plasma-atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), galvanostatic charge/discharge test, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), respectively. The results of XRD and Rietveld refinements demonstrate that Cu and Ti co-substitution does not destroy the crystal structure, but can decrease cation ordering level and improve structural integrity. Electrochemical results show that Cu and Ti addition also results in an improved rate and cycling performances compared to pristine LiNi0.6Co0.15Mn0.25O2. An increase in rate performance and cycle stability upon copper and titanium co-substitution is related to the better hexagonal structure and enhanced kinetics of the intercalation process. Especially, Li(Ni0.6Co0.15Mn0.25)0.99(CuTi)0.01O2 exhibits the best rate performance and cycle stability among all samples with discharge specific capacity of 178.8 mAh/g and capacity retention of 90.6% after 30 cycles at 0.2C, which are higher than those of other materials.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2226-3
      Issue No: Vol. 24, No. 2 (2018)
  • The effect of anodising time on the electrochemical behaviour of the
           Ti/TiO 2 NTs/IrO 2 -RuO 2 -Ta 2 O 5 anode
    • Authors: Mohammad Zahedi; Kourosh Jafarzadeh; Masoud Mirjani; Hadiseh Mazhari Abbasi
      Pages: 451 - 458
      Abstract: Nowadays, mixed metal oxide (MMO) anodes are a superior alternative to lead alloys in electrowinning processes. Passivation of titanium substrate is the most common mechanism of deactivation in these anodes. In this research, titanium oxide nanotubes have been utilised as an interlayer between the substrate and a mixed metal oxide coating in order to improve the anode electrochemical behaviour and life via retardation of titanium passivation. Anodising of the substrate was done in 0.5 wt% hydrofluoric acid for 30, 60 and 240 min. The samples were subsequently coated with a coating composed of IrO2-RuO2-Ta2O5. The microstructure of different samples was observed by scanning with an electron microscope, and the electrochemical behaviour of the samples was studied by accelerated life test, cyclic voltammetry and electrochemical impedance spectroscopy. The studies showed that formation of titanium oxide nanotubes with anodising times of 60 and 240 min increases the life of the anode through the provision of a compact coating. The life of the anode which was anodised for 240 min lasted about 20% longer than the sample which had a substrate without any anodised layer.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2210-y
      Issue No: Vol. 24, No. 2 (2018)
  • Electrosynthesis and characterization of poly aniline/garnet nanoparticles
           for high-performance electrochemical capacitors
    • Authors: Javad Shabani Shayeh; Ali Ehsani; Ali Naeemy; Hamid Mohammad Shiri; Fataneh Fatemi; Amir Yadegari; Meisam Omidi
      Pages: 505 - 511
      Abstract: In this work, supercapacitive performance of polyaniline/yttrium aluminum garnet (YAG: Y3Al5O12) nanoparticles (PANI/YAGNPs) was studied. YAG nanoparticles were synthesized by pulse electro-deposition method and after that, PANI/YAGNPs electrodeposited on the surface of glassy carbon electrodes through cyclic voltammetry. Morphological studies show that YAG nanoparticles were distributed in the structure of PANI filaments uniformly. XRD and FTIR were used to perform a structural study of materials. Different electrochemical techniques such as cyclic voltammetry (CV), galvano static charge discharge (CD), and impedance spectroscopy (EIS) were used to evaluate the applicability of using PANI/YAGNPs as an active material for supercapacitors. The specific capacitance (SC) of PANI and PANI YAG NPs electrodes calculated using CV technique are 240 and 440 F/g, respectively. Increasing the conductivity and stability of composite electrodes during continuous CD cycles compared to PANI ones are some features of using YAG NPs in the structure of polymer electrodes. Stability of composite electrodes remains about 98% through 1000 continuous cycles whereas the polymeric electrode loses about 91% of its capacitance during this time range.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2217-4
      Issue No: Vol. 24, No. 2 (2018)
  • Honeycomb-like manganese oxide nanospheres for redox supercapacitors
    • Authors: Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon
      Pages: 523 - 528
      Abstract: Honeycomb-like MnO2 nanospheres were synthesized using stainless steel substrates by a facile chemical bath deposition method. The obtained nanospheres were about 200–400 nm in diameter and consisted of porous ultrathin nanosheets. Honeycomb-like MnO2 nanospheres exhibited a high specific capacitance of 240 F g−1 and 87.1% capacitance retention after 1000 cycles at a current density of 0.5 A g−1. These remarkable electrochemical results imply great potential for applications of the honeycomb-like MnO2 nanospheres in supercapacitors.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2218-3
      Issue No: Vol. 24, No. 2 (2018)
  • Mesoporous and amorphous NiCoBP alloys with high specific capacitance for
    • Authors: Xianguo Ma; Qian Ren; Hui Wang; Shan Ji
      Pages: 529 - 537
      Abstract: A facile and versatile low-cost solid-liquid interface-mediated method for the synthesis of mesoporous and amorphous NiCoBP alloys with high surface areas was developed. The precursors of Ni, Co, and P, with a controllable molar ratio, were first dissolved in ultrapure water, frozen, and treated with NaBH4 solution to form NiCoBP alloys at room temperature. Benefiting from its mesoporous and amorphous structural features, the as-prepared NiCoBP alloy exhibited high surface area and exceptional electrochemical performance for use as a cathode material in asymmetric supercapacitors, yielding specific capacitance of up to 1030.4 F g−1 at 6 A g−1 with excellent cycling stability with a retention rate of 81.9% after 2000 cycles.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2221-8
      Issue No: Vol. 24, No. 2 (2018)
  • Synthesis and electrochemical characterization of amorphous
           manganese-nickel oxide as supercapacitor electrode material
    • Authors: P.Y. Chan; S.R. Majid
      Pages: 539 - 548
      Abstract: An amorphous composite film consisted of manganese and nickel oxide was synthesized using simple chronopotentiometry method and tested as electrode material for supercapacitor. The composite film was examined using X-ray diffraction, transmission electron microscopy, and electrochemical characterizations. The electrochemical characterization was performed using cyclic voltammetry, galvanostatic charge-discharge, and frequency response analyzer by a three-electrode configuration. The prepared composite electrode remained amorphous until 400 °C. The composite film deposited at 13 min and annealed at 300 °C was found to perform the best. It exhibited a good specific capacitance of 670 F g−1 over a potential window of 1 V in 1 M Na2SO4. Annealing temperature higher than 300 °C brought about a rapid decrease in specific capacitance. The composite electrode remained 61% of initial specific capacitance after 1000 cycles.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2227-2
      Issue No: Vol. 24, No. 2 (2018)
  • Chitosan-based hybrid nanocomposite on aluminium for hydrogen production
           from water
    • Authors: Didem Balun Kayan; Merve İlhan; Derya Koçak
      Pages: 563 - 569
      Abstract: The activity of the hydrogen evolution reaction (HER) has been investigated on a polypyrrole-chitosan composite film decorated with a small amount of gold (Au) nanoparticles coated on an aluminium electrode. The facile aluminium modified with such a hybrid nanocomposite and its performance was investigated for hydrogen evolution for the first time. A simple two-step approach was applied, including the first co-electrodeposition of polypyrrole and chitosan at a constant current electrolysis accompanied by the electrodeposition of Au nanoparticles via cyclic voltammetry. The chitosan (Chi), which is available in abundant quantities as a raw material, was incorporated into polypyrrole (PPy) chains, and it plays a key role in keeping metal nanoparticles highly dispersed and interconnected through the formation of a collaborative hybrid network. The low loading (≈2 wt%) of Au on this composite film favoured the related reaction more with a high cathodic current density and reduced the Tafel slope (−152 mV dec−1) confirming that the reaction proceeded via the Volmer-Heyrovsky mechanism with a rate control step by the Volmer reaction (proton discharge step). In addition, the long-term durability over 8 h achieved this hybrid composite as a promising nano-electrocatalyst for HER.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2208-5
      Issue No: Vol. 24, No. 2 (2018)
  • Study on the electrochemical performance of lead-acid battery with
           micro/nanostructure tetrabasic lead sulfate prepared via sol-gel method
    • Authors: Xiaoshi Lang; Yilin Zhao; Kedi Cai; Lan Li; Qingguo Zhang; Hao Wu
      Pages: 571 - 576
      Abstract: Tetrabasic lead sulfate (4BS) is a common positive active material additive for lead-acid battery. It is used for inhibiting positive active material softened in order to improve its cycle life. In this paper, we synthesize a type of micro/nanostructure 4BS via sol-gel method and analyze the electrochemical performances of the positive active material for the lead-acid battery after adding the additive. Results indicate that when the sintering temperature is 400 °C, micro/nanostructure 4BS can be successfully obtained. The grain size can be controlled to below 1 μm. The micromorphology of the cured positive active material with 1% micro/nanostructure 4BS is fine and shuttles evenly. Electrochemical analysis shows that the specific capacities of positive active material with the micro/nanostructure 4BS can reach 95.28, 84.81, and 74.53 mAh.g−1 at 0.1, 0.25, and 0.5C, respectively. After 100 cycles, specific capacity only declined by 9.79%. Graphical abstract A type of micro/nanostructure 4BS is prepared via sol-gel method. The 4BS has small crystallite size and uniform grain distribution. When the cured positive active material is added to the 1% micro/nano structure 4BS, it can be formed stable active material skeleton and has very high specific capacity, rate performance and long cycle life.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2205-8
      Issue No: Vol. 24, No. 2 (2018)
  • Synergistic growth of Li 3 V 2 (PO 4 ) 3 @MWCNTs@C nanocomposites as
           high-rate cathodes for Li-ion batteries
    • Authors: Li-Bo Zhang; Li-Zhen Wang; Ji Yan
      Pages: 629 - 637
      Abstract: Composite cathodes composed of Li3V2(PO4)3 and multiwall carbon nanotubes (MWCNTs) for high-performance Li-ion batteries were synthesized via a fast sol-gel method, using ascorbic acid as reductive reagent and carbon source, while using MWCNTs as high conductivity modifier. Due to the synergistic effect between functional groups of MWCNTs and reductive functionality of ascorbic acid, MWCNTs were uniformly embedded into Li3V2(PO4)3@C for constructing a unique three-dimensional architecture with excellent electronic and ionic conductivity to achieve superior high rate performance. When tested as a cathode material in lithium-ion batteries, the optimal Li3V2(PO4)3@MWCNTs@C composite can deliver 123.5 mAh g−1 of specific capacity at 5 C and maintain a capacity retention of 96.3% after 300 cycles; even after cycled at 15-C rate for 300 times, it still possesses 90.2 mAh g−1 of specific capacity, demonstrating a great promising result for cathode alternative in high-power lithium-ion batteries.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-017-2403-4
      Issue No: Vol. 24, No. 2 (2018)
  • Nano Li 4 Ti 5 O 12 as sulfur host for high-performance Li-S battery
    • Authors: Tianbiao Zeng; Penghui Ji; Biao Shang; Qimeng Peng; Xuebu Hu; Gang Li
      Abstract: S/Li4Ti5O12 cathode with high lithium ionic conductivity was prepared for Li-S battery. Herein, nano Li4Ti5O12 is used as sulfur host and fast Li+ conductor, which can adsorb effectively polysulfides and improve remarkably Li+ diffusion coefficient in sulfur cathode. At 0.5 C, S/Li4Ti5O12 cathode has a stable discharge capacity of 616 mAh g−1 at the 700th cycle and a capacity loss per cycle of 0.0196% from the second to the 700th cycle, but the corresponding values of S/C cathode are 437 mAh g−1 and 0.0598%. Even at 2 C, the capacity loss per cycle of S/Li4Ti5O12 cathode is only 0.0273% from the second to the 700th cycle. The results indicate that Li4Ti5O12 as the sulfur host plays a key role on the high performance of Li-S battery due to reducing the shuttle effect and enhancing lithium ionic conductivity.
      PubDate: 2018-02-06
      DOI: 10.1007/s11581-018-2468-8
  • Confrontation of the Ohmic approach with the ionic transport approach for
           modeling the electrical behavior of an electrolyte
    • Authors: E. Karimi-Sibaki; A. Kharicha; M. Wu; A. Ludwig; J. Bohacek
      Abstract: Two mathematical approaches have been compared for modeling the electrical behavior (e.g., electric/current density field) of an electrolyte. The first approach uses the traditional Ohmic method (Laplace equation) based on the assumption of a uniform concentration of ions in the electrolyte. The second approach utilizes the ionic transport method that takes into account the effect of electrochemical transport/reaction of ions assuming a quasi-electro neutral bulk for the electrolyte. For the latter, the Poisson–Nernst–Planck (PNP) equations are employed to include impacts of the non-uniformity of the concentration of ions on the electrical pattern of the electrolyte. Demonstratively, a 2D case was studied. It comprises two unequally sized electrodes, which are separated by the electrolyte. Findings show that the electrical behavior of the electrolyte remains unchanged using an Ohmic approach, regardless of variations in operational parameters such as applied voltage and electrode polarity. In contrast, the electrical behavior in response to the operational parameters is found to be significantly influenced using the ionic transport approach. Therefore, Ohm’s law is invalid in the bulk of an electrolyte, when a non-uniform concentration field of ions exists. Ultimately, the obtained results helped to propose an explanation on a commonly observed phenomenon (melt rate-polarity relationship) during the DC operation of the electroslag remelting (ESR) process.
      PubDate: 2018-02-05
      DOI: 10.1007/s11581-018-2460-3
  • Effect of H 3 PO 2 on the mechanical, thermal, and electrical properties
           of polymers based on poly (vinyl alcohol) (PVA) and chitosan (CS)
    • Authors: M. Benítez; Jesús-Evelio Diosa; R. A. Vargas
      Abstract: A polymer based on poly (vinyl alcohol) (PVA) and chitosan (CS) with a weight ratio of 80:20 was prepared by solvent casting processes, and the effect of H3PO2 was investigated. Thermal analysis shows miscibility of the two polymer amorphous phases since a single Tg was located between those of the individual components and the melting point of the crystalline phase was depressed to 189 °C. It was found that the acid acts as a plasticizer for the PVA-CS blends and its Tg is depressed significantly to 23 °C as the acid concentration increases to 50%. Strain-stress tests also corroborate this effect. The DC conductivity of the blends follows an Arrhenius-type thermal activation behavior with activation energy of 0.1 eV in the 30–90 °C temperature range. Moreover, the conductivity increases with increasing acid content up to a maximum value of approximately 1.4 × 10−2 S/cm for the blend with an acid concentration of 50%.
      PubDate: 2018-02-04
      DOI: 10.1007/s11581-018-2465-y
  • Ternary-material lithium-ion battery SOC estimation under various ambient
    • Authors: Maji Luo; Yazhou Guo; Jianqiang Kang; Liyang She; Zhichao Geng
      Abstract: Ambient temperature produces great effects on battery state-of-charge (SOC) estimation, due to the unstable estimation algorithm, the weakened traceability of battery model, and variable model parameters at various temperatures, especially lower temperatures. The widely used method based on the equivalent circuit model (ECM) offline in using different algorithm, like current integral, the extended Kalman filter (EKF), or the unscented Kalman filter (UKF), can obtain an accurate SOC estimation at room temperature, but it is difficult to guarantee the high precision at lower temperatures. To address this problem, the battery model is investigated at different temperature, and an offset item is proposed to develop the observer equation in the estimated model. Then, the square root of the Sigma points Kalman filter (SR-UKF) is applied, and on the basis of the individual model parameter-temperature table and the developed model, the high accuracy of SOC estimation is achieved. Additionally, considering the burden of original parameter modification (all model parameters modified) at various temperature which will increase the product cost and computational complexity of the battery management system (BMS), the relationship between individual model parameter and the error of SOC estimation is built, which is helpful for the simplification of parameter modification. The results indicate that the proposed method based on the developed estimated model and the simplified parameter modification can achieve an accurate, stable, and efficient SOC estimation.
      PubDate: 2018-02-04
      DOI: 10.1007/s11581-018-2444-3
  • Investigation of the synergetic effects of LiBF 4 and LiODFB as
           wide-temperature electrolyte salts in lithium-ion batteries
    • Authors: Lijuan Zhang; Yanxia Sun; Yuan Zhou; Chunxi Hai; Shuqing Hu; Jinbo Zeng; Yue Shen; Shengde Dong; Guicai Qi; Faqiang Li
      Abstract: Herein, we present the use of lithium tetrafluoroborate (LiBF4) as an electrolyte salt for wide-temperature electrolytes in lithium-ion batteries. The research focused on the application of blend salts to exhibit their synergistic effect especially in a wide temperature range. In the study, LiCoO2 was employed as the cathode material; LiBF4 and lithium difluoro(oxalate)borate (LiODFB) were added to an electrolyte consisting of ethylene carbonate (EC), propylene carbonate (PC), and ethyl methyl carbonate (EMC). The electrochemical performance of the resulting electrolyte was evaluated through various analytical techniques. Analysis of the electrical conductivity showed the relationship among solution conductivity, the electrolyte composition, and temperature. Cyclic voltammetry (CV), charge-discharge cycling, and AC impedance measurements were used to investigate the capacity and cycling stability of the LiCoO2 cathode in different electrolyte systems and at different temperatures. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were applied to analyze the surface properties of the LiCoO2 cathode after cycling. The results indicated that the addition of a small amount of LiODFB into the LiBF4-based electrolyte system (LiBF4/LiODFB of 8:2) may enhance the electrochemical performance of the LiCoO2 cell over a relatively wide temperature range and improve the cyclability of the LiCoO2 cell at 60 °C.
      PubDate: 2018-02-02
      DOI: 10.1007/s11581-018-2470-1
  • Tea polyphenols as a novel reaction-type electrolyte additive in
           lithium-ion batteries
    • Authors: Shilei Bian; Minqing Liu; Yueli Shi; Quanchao Zhuang; Yongli Cui; Yanhua Cui
      Abstract: In this study, we reported tea polyphenols (TP) as a novel, cheap, environment-friendly and easy dissolution in common electrolytes reaction-type electrolyte additive for the graphite anode of the lithium-ion batteries. The TP can capture less stable radical anions that are harmful to oxidation stability of ethylene carbonate (EC) to form stable polymer. To a certain extent, it improved the electrochemical performance of the graphite electrode such as reversible capacity and cyclic stability by charge-discharge test, cyclic voltammetry (CV), scanning electron microscope (SEM), and electrochemical impedance microscope (EIS). The first charge capacities of the graphite electrodes in electrolytes without and with TP were 327.1 and 349.1 mAh g−1, respectively. The charge capacities were 306.8 and 344.2 mAh g−1 after 100 cycles and the capacity retention were 93.79 and 98.60%, respectively. The improvement was benefited from the effective scavenging the less stable radical anions and improvement the oxidation stability of EC and formation of a stable, compact and thin solid electrolyte interface (SEI) film with lower resistance.
      PubDate: 2018-02-02
      DOI: 10.1007/s11581-018-2445-2
  • Nernst voltage losses in planar fuel cells caused by changes in chemical
           composition: effects of operating parameters
    • Authors: Ashwini Kumar Sharma; Khaliq Ahmed; Erik Birgersson
      Abstract: Conventionally, the reversible potential at inlet conditions is considered to be the ideal voltage for a fuel cell. However, the reversible potential in planar cells varies along the cell length due to changes in gas composition caused by consumption of fuel and oxidant. This contributes to voltage losses, referred to as Nernst losses, compared to the reversible potential at the inlet of the cell. In the conventional breakdown of cell voltage losses, the variation of reversible potential is not accounted for. To estimate the “true” losses, this needs to be accounted for by employing calculations of the reversible potential with changing composition. This paper quantifies such losses in the context of solid oxide fuel cells (SOFCs) for which they are found to contribute significantly, in the range of 25 to 33% of the total voltage losses. The Nernst equation for fuel cell operation is analyzed and analytical expressions for Nernst losses are derived. The latter allows prediction of the effects of operating parameters which are later verified with an isothermal model of the SOFC.
      PubDate: 2018-02-02
      DOI: 10.1007/s11581-018-2454-1
  • Dramatic reduction in the densification temperature of garnet-type solid
    • Authors: Michael Wang; Jeff Sakamoto
      Abstract: Cubic garnet Li7La3Zr2O12 (LLZO) and similar compositions of fast ion-conducting solid-state electrolytes have shown great potential for the development of high-energy-density solid-state Li-ion batteries. Although these materials have shown unprecedented ionic conductivities and chemical stability, these materials require high processing temperatures for synthesis. For many of the common compositions of LLZO, temperatures above 1000 °C are required to form the cubic garnet phase and to achieve high conductivities. Therefore, lowering the processing temperatures of these materials is of great interest for the purposes of scalability and fabrication. It has been reported that a Bi co-dopant not only stabilizes the cubic garnet phase but also lowers the densification temperature. In this study, Li6La3ZrBiO12 (LLZBO) was prepared by a rapid-induction hot-pressing technique and characterized using a variety of techniques, including X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. We demonstrate the ability to synthesize phase-pure LLZBO with higher relative densities (~ 94%) than can be achieved by pressure-less sintering methods, at pressing temperatures of only 850 °C. The ionic conductivity was measured to be 0.1 mS cm−1, which is comparable to the best reported conductivities of high-density LLZO. This demonstrates the ability to fabricate dense, phase-pure, and high-conductivity LLZBO at temperatures significantly lower than other garnet compositions, which will prove useful for scalability and reducing reactivity with cathodes during densification.
      PubDate: 2018-02-01
      DOI: 10.1007/s11581-018-2464-z
School of Mathematical and Computer Sciences
Heriot-Watt University
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