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  Subjects -> ENGINEERING (Total: 2279 journals)
    - CHEMICAL ENGINEERING (191 journals)
    - CIVIL ENGINEERING (185 journals)
    - ELECTRICAL ENGINEERING (101 journals)
    - ENGINEERING (1203 journals)
    - ENGINEERING MECHANICS AND MATERIALS (390 journals)
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ENGINEERING (1203 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Production and Operations Management     Hybrid Journal   (Followers: 12)
Production Engineering     Hybrid Journal   (Followers: 5)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 10)
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: 32)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 291)
Propulsion and Power Research     Open Access   (Followers: 25)
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: 1)
Reactive and Functional Polymers     Hybrid Journal   (Followers: 5)
Recent Patents on Engineering     Full-text available via subscription   (Followers: 3)
Recent Patents on Nanotechnology     Full-text available via subscription   (Followers: 3)
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  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 40)
Remote Sensing Letters     Hybrid Journal   (Followers: 37)
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: 20)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 28)
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 CINTEX     Open Access   (Followers: 1)
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  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 22)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 8)
Safety Science     Hybrid Journal   (Followers: 30)
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 China Technological Sciences     Hybrid Journal  
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 2)
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  
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 48)
Semiconductors     Hybrid Journal  
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: 16)
Separation and Purification Technology     Hybrid Journal   (Followers: 9)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Shock and Vibration     Hybrid Journal   (Followers: 10)
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: 4)
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: 11)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 8)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 62)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 15)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 11)
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: 2)
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)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal  
Surface Science Reports     Full-text available via subscription   (Followers: 13)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 1)
Sustainability Science     Hybrid Journal   (Followers: 8)
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: 2)
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 Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 5)
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: 31)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Textile Science and Technology     Full-text available via subscription   (Followers: 3)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 14)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 4)
Thermal Engineering     Hybrid Journal   (Followers: 7)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 2)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 63)
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: 1)
Tribology International     Hybrid Journal   (Followers: 43)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 33)
Ultramicroscopy     Hybrid Journal   (Followers: 2)
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)
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 3)
Visualization in Engineering     Open Access  
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)
Waves in Random and Complex Media     Hybrid Journal  
Waves, Wavelets and Fractals     Open Access  
Wear     Hybrid Journal   (Followers: 28)
Welding in the World     Hybrid Journal   (Followers: 4)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 12)
World Journal of Engineering     Full-text available via subscription   (Followers: 3)
World Journal of Engineering and Technology     Open Access  
World Journal of Environmental Engineering     Open Access   (Followers: 2)
World Pumps     Full-text available via subscription   (Followers: 2)
World Science and Technology     Full-text available via subscription  

  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  [2345 journals]
  • Structure and lithium storage performances of nickel hydroxides
           synthesized with different nickel salts
    • Authors: Yanwei Li; Wenqiang Xu; Zhiping Xie; Lingzhi Zhang; Jinhuan Yao
      Pages: 1625 - 1636
      Abstract: Nickel hydroxides with hierarchical micro-nano structures are prepared by a facile homogeneous precipitation method with different nickel salts (Ni(NO3)2·6H2O, NiCl2·6H2O, and NiSO4·6H2O) as raw materials. The effect of nickel sources on the microstructure and lithium storage performance of the nickel hydroxides is studied. It is found that all the three prepared samples are α-nickel hydroxide. The nickel hydroxides synthesized with Ni(NO3)2·6H2 or NiCl2·6H2O show a similar particle size of 20–30 μm and are composed of very thin nano-sheets, while the nickel hydroxide synthesized with Ni(SO4)2·6H2O shows a larger particle size (30–50 μm) and consists of very thin nano-walls. When applied as anode materials for lithium-ion batteries (LIBs), the nickel hydroxide synthesized with NiSO4·6H2O exhibits the highest discharge capacity, but its cyclic stability is very poor. The nickel hydroxides synthesized with NiCl2·6H2O exhibit higher discharge capacity than the nickel hydroxides synthesized with Ni(NO3)2·6H2O, and both of them show much improved cyclic stability and rate capability as compared to the nickel hydroxide synthesized with Ni(SO4)2·6H2O. Moreover, pseudocapacitive behavior makes a great contribution to the electrochemical energy storage of the three samples. The discrepancies of lithium storage performance of the three samples are analyzed by ex-situ XRD, FT-IR, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) tests.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1983-3
      Issue No: Vol. 23, No. 7 (2017)
       
  • Co 3 O 4 @MnO 2 core shell arrays on nickel foam with excellent
           electrochemical performance for aqueous asymmetric supercapacitor
    • Authors: Mengya Feng; Guowei Zhang; Qinghua Du; Li Su; Zhipeng Ma; Xiujuan Qin; Guangjie Shao
      Pages: 1637 - 1643
      Abstract: At present, a lot of attention has been paid to the reasonable design and synthesis of materials with core shell structure for high-performance supercapacitors. Herein, the Co3O4@MnO2 core shell arrays on nickel foam are successfully synthesized via a facile and effective hydrothermal method followed with annealing process. The sample was characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Electrochemical performance of the Co3O4@MnO2 material was studied using cyclic voltammetry, charge/discharge cycling, and electrochemical impedance measurements in 6 mol L−1 KOH aqueous electrolyte. The results indicated that the Co3O4@MnO2 material presented excellent electrochemical performance in terms of specific capacitance, cyclic stability, and charge/discharge stability.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2013-1
      Issue No: Vol. 23, No. 7 (2017)
       
  • Enhanced electrochemical performance of LiMnBO 3 with conductive glassy
           phase: a prospective cathode material for lithium-ion battery
    • Authors: V. Ragupathi; M. Safiq; P. Panigrahi; T. Hussain; S. Raman; R. Ahuja; G. S. Nagarajan
      Pages: 1645 - 1653
      Abstract: LiMnBO3 has been identified as a promising cathode material for next-generation lithium-ion batteries. In this study, LiMnBO3 along with glassy lithium borate material (LiMnBO3 (II)) is synthesized by sol-gel method. X-ray diffraction (XRD) analysis depicts the existence of LiBO2 glassy phase along with m-LiMnBO3 phase. Transmission electron microscopy (TEM) analysis confirms the presence of LiBO2 glassy phase. An enhanced electrical conductivity of 3.64 × 10−7 S/cm is observed for LiMnBO3 (II). The LiBO2 glassy phase is found to promote the Li reaction kinetics in LiMnBO3 (II). The synthesized LiMnBO3 (II) delivers a first discharge capacity of 310 mAh g−1 within a potential window of 1.5–4.5 V at C/10 rate. Further, a discharge capacity of 186 mAh g−1 at the 27th cycle shows a better cycle performance. The enhanced capacity is due to the presence of LiBO2 glassy phase and more than one Li-ion transfer in the lithium-rich stoichiometry of LiMnBO3 (II). Density functional theory calculation reveals the exact electronic structure of m-LiMnBO3 with a band gap of 3.05 eV. A charge transfer mechanism is predicted for delithiation process of m-LiMnBO3.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2019-8
      Issue No: Vol. 23, No. 7 (2017)
       
  • Effect of pyrolytic polyacrylonitrile on electrochemical performance of
           Si/graphite composite anode for lithium-ion batteries
    • Authors: Qingmei Zhao; Wei Xiao; Xuemin Yan; Shaoxiong Qin; Baolong Qu; Lin Zhao
      Pages: 1685 - 1692
      Abstract: The silicon/graphite (Si/G) composite was prepared using pyrolytic polyacrylonitrile (PAN) as carbon precursor, which is a nitrogen-doped carbon that provides efficient pathway for electron transfer. The combination of flake graphite and pyrolytic carbon layer accommodates the large volume expansion of Si during discharge-charge process. The Si/G composite was synthesized via cost-effective liquid solidification followed by carbonization process. The effect of PAN content on electrochemical performance of composites was investigated. The composite containing 40 wt% PAN exhibits a relatively better rate capability and cycle performance than others. It exhibits initial reversible specific capacity of 793.6 mAh g−1 at a current density of 100 mA g−1. High capacity of 661 mAh g−1 can be reached after 50 cycles at current density of 500 mA g−1.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1992-2
      Issue No: Vol. 23, No. 7 (2017)
       
  • Promising anode material for lithium-ion cells based on cobalt oxide
           synthesized by microwave heating
    • Authors: C. P Sandhya; Bibin John; C. Gouri; H. Sreemoolanadhan; Sushant K. Manwatkar
      Pages: 1693 - 1701
      Abstract: High-performance anode material for lithium-ion cell based on cobalt oxide was synthesized through a combination of sol-gel route and subsequent microwave heating. The influence of microwave irradiation temperature of the precursor on the characteristics of the active materials formed was studied. The physicochemical, structural, and morphological properties of the materials were studied in addition to the electrochemical performance by cyclic voltammetry and charge-discharge cycling vs. Li+/Li. Microwave heating at 350 °C resulted in the formation of Co3O4, whereas at 450 and 550 °C, a mixture of Co3O4, CoO, and Co was formed. Co3O4 synthesized at 350 °C possessed porous morphology with high specific surface area and exhibited superior electrochemical performance with initial specific capacity of 982 mAh g−1 and coulombic efficiency of ~75% along with good cycle performance retaining ~87% of initial capacity after 60 cycles.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2015-z
      Issue No: Vol. 23, No. 7 (2017)
       
  • Electrochemical preparation of Ni-La alloys from the EMIC-EG
           eutectic-based ionic liquid
    • Authors: Yingya Yang; Cunying Xu; Yixin Hua; Mengmeng Wang; Zhaolei Su
      Pages: 1703 - 1710
      Abstract: The electrodeposition behavior of Ni-La alloys was investigated in 1-ethyl-3-methylimidazolium chloride-ethylene glycol (EMIC-EG; 1:2-M ratio) eutectic-based ionic liquid containing 0.1 M NiCl2 and 0.2 M LaCl3. Cyclic voltammograms revealed that La could be co-deposited with Ni under the inducement of Ni(II) species in this solvent. The analysis of the chronoamperometric transients showed that, as with deposition of metal Ni, the co-deposition of Ni-La alloy on a glassy carbon electrode followed an instantaneous nucleation and three-dimensional growth controlled by diffusion. Galvanostatically deposited Ni-La alloys with different composition and morphology were characterized by inductively coupled plasma–atomic emission spectrometry (ICP-AES), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). The current density and temperature were found to play an important role in controlling the composition and surface morphology of the resultant Ni-La alloys. The structure of these deposits depended on the La content. Alloys containing less than 4 at.% La could be indexed to a disordered face-centered cubic structure similar to pure Ni, whereas alloys containing about 9 at.% Ni were completely amorphous (metallic glass).
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1993-1
      Issue No: Vol. 23, No. 7 (2017)
       
  • Electrical and complex dielectric behaviour of composite polymer
           electrolyte based on PEO, alumina and tetrapropylammonium iodide
    • Authors: T. M. W. J. Bandara; D. G. N. Karunathilaka; J. L. Ratnasekera; L. Ajith De Silva; A. C. Herath; B. E. Mellander
      Pages: 1711 - 1719
      Abstract: In this study, the electrical, dielectric and morphological analysis of composite solid polymer electrolytes containing polyethylene oxide, alumina nano-fillers and tetrapropylammonium iodide are conducted. The temperature dependence of conductivity shows activation energy of 0.23, 0.20 and 0.29 eV for electrolytes containing 0, 5 and 15 wt.% alumina, respectively, when data fitted to the Arrhenius equation. These activation energy values are in good agreement with those determined from dielectric measurements. The result confirms the fact that conductivity is activated by both the mobility and the charge carrier density. The conductivity isotherms demonstrated the existence of two peaks, at 5 and 15 wt.% Al2O3 composition. The highest conductivity values of 2.4 × 10−4, 3.3 × 10−4 and 4.2 × 10−4 S cm−1 are obtained for the sample with 5 wt.% Al2O3 at 0, 12 and 24 °C, respectively, suggesting an enhancement of conductivity compared with that of alumina free samples.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2016-y
      Issue No: Vol. 23, No. 7 (2017)
       
  • Synthesis of hierarchical Na 2 FeP 2 O 7 spheres with high electrochemical
           performance via spray drying
    • Authors: JiaLi Cao; Liang Ni; CanCan Qin; YueFeng Tang; YanFeng Chen
      Pages: 1783 - 1791
      Abstract: Hierarchical Na2FeP2O7 spheres with nanoparticles were successfully fabricated by a facile spray drying method. A relatively low drying temperature was introduced in order to form a carbon layer on the surface. As a cathode material for sodium-ion batteries, it delivered a reversible capacity of 84.4 mAh g−1 at 0.1 C and showed excellent cycling and rate performance (64.7 mAh g−1 at 5 C). Furthermore, a full sodium battery was fabricated using SP-Na2FeP2O7 as the cathode and hard carbon as the anode, suffering almost no capacity loss after 400 cycles at 1 C. Due to its superior electrochemical property and the low materials cost, Na2FeP2O7 is becoming a promising cathode material for large-scale energy storage systems.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2020-2
      Issue No: Vol. 23, No. 7 (2017)
       
  • Aspects of proton transport in calix[6]arene sulfonic acid
    • Authors: Lyubov Shmygleva; Evgeny Sanginov; Nikita Slesarenko; Aleksander Chernyak; Aleksander Karelin; Yury Dobrovolsky
      Pages: 1793 - 1800
      Abstract: The features of proton transport and proton hydration shell structure of calix[6]arene sulfonic acid were studied. XRD and NMR data indicate the existence of crystalline and amorphous phases and various conformations in the acid structure. The hydration process occurs in three stages by thermal analysis and IR spectroscopy. The change in the composition of the hydrate affected the conductivity only at low humidity; an inverse relationship between the water uptake and the activation energy of conductivity is observed in the entire investigated range of humidity.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2011-3
      Issue No: Vol. 23, No. 7 (2017)
       
  • Comparison of electrochemical performance for zinc anode via various
           electrolytes and conducting agents in Zn-air secondary batteries
    • Authors: Seong-Hun Lee; Da-Jeong Park; Won-Geun Yang; Kwang-Sun Ryu
      Pages: 1801 - 1809
      Abstract: Zn-air batteries have many advantages as energy devices but they show a poor charge-discharge cycle performance. Therefore, this study examined the effects of various types of electrolytes and conducting agents and changed the additive contents to optimize the electrochemical performance of Zn-air secondary batteries. Electrolytes, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH) solutions, and conducting agents, such as super-p, denka black, acetylene black, and ketjen black, were used to increase the electric conductivity. The electrochemical performance of the zinc anode was evaluated from charge-discharge capacities and cycle efficiency. When the capacity was compared according to each electrolyte from one to ten cycles, in contrast, the zinc anode in 6 M KOH showed a higher discharge capacity in the first cycle. Therefore, zinc anode was composed in the 6-M KOH electrolyte and conducting agents were added. The zinc anode included conducting agents with a higher cycle capacity than those without conducting agents, and super-p had a higher first discharge capacity than the others. Therefore, the zinc anode with super-p of 4% shows the highest performance using 6 M KOH in Zn-air secondary batteries.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2005-1
      Issue No: Vol. 23, No. 7 (2017)
       
  • Synthesis of interconnected needle-like Bi 2 O 3 using successive ionic
           layer adsorption and reaction towards supercapacitor application
    • Authors: Shrikant S. Raut; Omeshwari Bisen; Babasaheb R. Sankapal
      Pages: 1831 - 1837
      Abstract: An interconnected needle-like structure of Bi2O3 has been directly grown on stainless steel (SS) substrate by binder-free successive ionic layer adsorption and reaction (SILAR) method. The structural study confirms the formation of cubic δ-Bi2O3 phase. The coverage of interconnected needle-like network structure has been seen from surface morphological study. The electrochemical performance of Bi2O3 has been tested as an electrode material through cyclic voltammetry, charge–discharge, and electrochemical impedance spectroscopy techniques in aqueous electrolyte. The electrochemical tests manifest the pseudocapacitive behavior of Bi2O3 thin-film electrode with a specific capacitance of 329.6 F g−1 at 5 mV s−1 scan rate. In addition, the Bi2O3 electrode exhibits long-term cycling performance with 72% capacitance retention after 3000 cycles. Graphical abstract
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1994-0
      Issue No: Vol. 23, No. 7 (2017)
       
  • Flexible wire-based electrodes exploiting carbon/ZnO nanocomposite for
           wearable supercapacitors
    • Authors: Amjid Rafique; Stefano Bianco; Marco Fontana; Candido F. Pirri; Andrea Lamberti
      Pages: 1839 - 1847
      Abstract: A facile and scalable approach is here proposed to fabricate fiber-shaped electrodes and their integration into wearable supercapacitors. Copper wires were used as axial current collector and covered by dip coating with a carbon-based slurry. A gel electrolyte was used both as ionic conductor and separator between the two parallel wire-electrodes. The decoration of the carbon-based active material with ZnO nanoparticles was investigated in order to boost the supercapacitors performance exploiting the pseudocapacitive response of this wide band-gap semiconductor. Composites of ZnO/graphite with different wt.% ZnO (such as 1, 5, 10, 20% of ZnO nanoparticles) were prepared. X-ray powder diffraction and Raman micro spectroscopy served as phase-analytical methods. Field emission scanning electron microscopy technique was used for morphology characterization of the prepared samples. The electrical characterization of the devices showed excellent results both in terms of specific capacitance and cycling and bending stability. The ease of the proposed process can allow its rapid integration in a large-scale production for efficient wearable supercapacitors. Graphical abstract Parallel wire shape supercapacitors
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2003-3
      Issue No: Vol. 23, No. 7 (2017)
       
  • Preparation of carbon-supported Pd-decorated PtCu nanoparticles towards
           formic acid oxidation reaction
    • Authors: Yange Suo; Chenbin Rong; Yuxin Guo; Zhiguo Zhang; Guilin Hu; Yousheng Xu; Xinfa Zhou
      Pages: 1861 - 1869
      Abstract: This work reports the synthesis of a novel carbon-supported Pd-decorated PtCu nanocatalyst for formic acid oxidation. Without using surfactants or polymers, PtCu alloy was firstly prepared through simply co-reduction of Pt and Cu ions using ethylene glycol and sodium citrate as the reducing and stabilizing reagents. Then, Pd was decorated on the surface of PtCu through spontaneous replacement of Cu by Pd. XRD results suggest that the lattice parameters of the PtCu and Pd-decorated PtCu nanoparticles are smaller than that of Pt. TEM images show that all metallic nanoparticles are well dispersed on the carbon surface. The average particle size of the Pd-decorated PtCu nanoparticles is 2.9 nm. Electrochemical analysis suggests that the carbon-supported Pd-decorated PtCu nanocatalyst exhibits an enhanced activity for formic acid oxidation in comparison with the carbon-supported Pt and carbon-supported PtCu, as well as a high stability in acidic medium.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1986-0
      Issue No: Vol. 23, No. 7 (2017)
       
  • Electrocatalytic conversion of carbon dioxide to urea on nano-FeTiO 3
           surface
    • Authors: Palanisamy Siva; Periasamy Prabu; Mohanraj Selvam; Subramani Karthik; Venkatachalam Rajendran
      Pages: 1871 - 1878
      Abstract: The effect of the electrochemical reduction of carbon dioxide (CO2) on the structure and morphology of two different synthesised nano FeTiO3 composite was examined after a fixed-potential bulk electrolysis process. FeTiO3 was used as the cathode, stainless steel (SS) plate as anode and CO2 saturated NaHCO3 and KNO2 as electrolysis. At optimized condition, CO2 is effectively reduced to urea. Fourier transform infrared spectroscopy (FTIR) used to examine the two different synthesis of nano FeTiO3 surfaces to reveal the carbonate ions and urea species during reduction. Ultraviolet–visible spectroscopy (UV) peaks explain the urea function groups present in electrolyte after the CO2 and NO2 reduction. Charge transfer resistance is using Electrochemical Impedance Spectroscopy (EIS) analysis. A systematic Cyclic Voltammetry (CV) and Linear Sweep Voltammetry (LSV), two different synthesis of FeTiO3 composite, were performed in order to decouple electrochemical reduction processes of CO2 and NO2 to urea in aqueous solutions.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1985-1
      Issue No: Vol. 23, No. 7 (2017)
       
  • Polyvinyl butyral-based gel polymer electrolyte films for solid-state
           laminated electrochromic devices
    • Authors: Fan Zhang; Guobo Dong; Jiang Liu; Shubing Ye; Xungang Diao
      Pages: 1879 - 1888
      Abstract: Polyvinyl butyral-based gel polymer electrolyte films (PVB-based GPEFs) were prepared by casting method. The surface morphology and ionic conductivity of the PVB-based GPEFs were measured; cyclic voltammetry behavior, optical properties, and coloration efficiency of the devices were investigated. The SEM shows amorphous polymer matrix with interval and micropores among the molecule chains. With different volume of ionic liquid, the ionic conductivity of electrolyte films increased up to 4.0 × 10−-5 and 6.2 × 10−5 S/cm at 25 and 50 °C, respectively. Electrochromic devices (ECDs) with glass/ITO/WO3/PVB-based GPEF/Ni1-xO/ITO/glass configuration were prepared following the technology of laminated safety glass. The best device provided excellent electrochromic performances with high optical modulation of 65.8% at 550 nm, coloration efficiency of 175.34 cm2/C, and long-term stability. In addition, small color fading of 4.8% was observed under self-discharging conditions for 16 h, proving that the PVB-based ECD possesses sufficient memory effect as smart window.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-1996-y
      Issue No: Vol. 23, No. 7 (2017)
       
  • Detection of catechin in Chinese green teas at N-doped carbon-modified
           electrode
    • Authors: Jian Pang; Xiujuan Wu; Anna Li; Xiaowang Liu; Maoguo Li
      Pages: 1889 - 1895
      Abstract: Herein, we present a simple and facile synthesis strategy of porous N-doped graphene (N-Gr) using a facile one-step pyrolysis method. The as-prepared N-Gr was characterized by power X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. N-Gr-modified glassy carbon electrode exhibited a lower overpotential and the higher redox peak currents for catechin during the electrochemical reaction of catechin. At the N-Gr-modified electrode, the redox process of catechin was almost reversible and displayed an adsorption-controlled redox process with a fast electron transfer rate. The linear responses of the sensor for catechin have been obtained by the differential pulse voltammetry in the range from 1.0 to 30 μM with the calculated detection limit of 0.088 μM (S/N = 3). The real application of catechin in Chinese green tea samples with excellent performance such as long-term stability and good reproducibility was successfully achieved.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2006-0
      Issue No: Vol. 23, No. 7 (2017)
       
  • Comparative study of the properties of TiO 2 nanoflower and TiO 2 -ZnO
           composite nanoflower and their application in dye-sensitized solar cells
    • Authors: S. A. M. Samsuri; M. Y. A. Rahman; A. A. Umar
      Pages: 1897 - 1902
      Abstract: We report the comparative study of TiO2 nanoflower (NF) and TiO2-ZnO composite NF in terms of properties and dye-sensitized solar cell performances. TiO2 NF has been constructed by using the simple liquid phase deposition (LPD) method while TiO2-ZnO composite NF was prepared by using dip-coating method in which the as-prepared TiO2 NF was immersed into ZnO growth solution. The power conversion efficiency of the DSSC utilizingTiO2-ZnO composite NF is higher (0.62 ± 0.02%) compared to TiO2 NF (0.17 ± 0.10%) due to higher photon absorption, dye loading, R cr, and longer electron life time than those of TiO2 NF.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2010-4
      Issue No: Vol. 23, No. 7 (2017)
       
  • A novel electro-chlorinator using low cost graphite electrode for drinking
           water disinfection
    • Authors: Jayeeta Saha; Sunil Kumar Gupta
      Pages: 1903 - 1913
      Abstract: A unique electro-chlorination reactor was designed with six numbers each of cylindrical shaped graphite anodes and stainless steel cathodes. A series of experiments were run in the laboratory scale applying lower current densities. Maximum active chlorine concentration of 0.75 mg/l was obtained at an optimum current density of 1.5 mA/cm2 from an available chloride concentration of 8.5 mg/l found naturally in the tap water. It was observed that with an increase in the current density, there was a marked decrease of chloride conversion from 50 to 42%. The maximum chloride conversion rate of 57.3% was achieved corresponding to an electrolysis time of 30 min. There was no marked change in pH after the electrolysis which may be attributed to the neutralization of hydroxyl ions generated at the cathode with the protons spitted at the anode. A maximum energy consumption of 0.083 kWh/m3 was required for generating a maximum active chlorine concentration of 2 mg/l from chloride concentration of 50 mg/l added externally in the water. After a continuous operation of 3 months, it was found that the graphite electrodes were corroded at the rate of 0.005 mm/h. A strong positive Pearson correlation of 0.988 was obtained among the parameters current density, chloride concentration, time, pH and active chlorine, whereas a negative correlation coefficient of −0.902 was obtained between electrolysis time and formation rate of active chlorine. The present work provides a simple reactor design strategy to use affordable graphite electrodes in the field application of electrochemical point of use of drinking water disinfection.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2022-0
      Issue No: Vol. 23, No. 7 (2017)
       
  • Carbon-doped MoS 2 nanosheet photocatalysts for efficient degradation of
           methyl orange
    • Authors: Zhenyin Hai; Jiangong Du; Mohammad Karbalaei Akbari; Chenyang Xue; Hongyan Xu; Serge Zhuiykov
      Pages: 1921 - 1925
      Abstract: A facile doping method for two dimensional (2D) materials utilizing inexpensive raw materials was proposed to achieve excellent photocatalytic degradation of methyl orange (MO). In this work, MoS2 nanosheets were synthesized and carbon-doped using carbon-assistant heating with degreasing cotton. The prepared samples were characterized and investigated as photocatalysts for degradation of MO under visible light. The obtained results showed that the modified MoS2 nanosheets with the lateral width of ~600 nm were filled with defects and Mo-C bond was found in the nanosheets. The carbon-doped MoS2 nanosheets with rich defects were demonstrated to have an excellent photocatalytic property with optimum dosage of 0.3 g/L photocatalyst in 40 mg/L MO solution. It displayed high degradation efficiency and very good repeatability in comparison with other reported works of MoS2 nanosheets and other nanocomposites.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2144-4
      Issue No: Vol. 23, No. 7 (2017)
       
  • Facile fabrication of coal-derived activated carbon/Co 3 O 4
           nanocomposites with superior electrochemical performance
    • Authors: Junsheng Zhu; Shuangquan Zhang; Dianlong Wang
      Pages: 1927 - 1931
      Abstract: Coal-derived activated carbon/Co3O4 nanocomposites have been prepared via a facile two-step synthetic strategy. Results indicate that Co3O4 nanoparticles possess a uniform distribution on the surface of coal-derived activated carbon. The electrochemical performance of the as-prepared samples had been investigated by cyclic voltammetry and galvanostatic charge/discharge measurement. Results suggest that the nanocomposites exhibit higher specific capacitance than bare Co3O4 and coal-derived activated carbon. The superior capacitive performance is further illustrated by electrochemical impedance spectroscopy measurement, which demonstrates that the introduction of coal-derived activated carbon in the nanocomposites can not only improve the electron transfer but also promote the electrolyte penetration.
      PubDate: 2017-07-01
      DOI: 10.1007/s11581-017-2145-3
      Issue No: Vol. 23, No. 7 (2017)
       
 
 
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