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  Subjects -> ENGINEERING (Total: 2277 journals)
    - CHEMICAL ENGINEERING (191 journals)
    - CIVIL ENGINEERING (184 journals)
    - ELECTRICAL ENGINEERING (103 journals)
    - ENGINEERING (1203 journals)
    - ENGINEERING MECHANICS AND MATERIALS (381 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (69 journals)
    - MECHANICAL ENGINEERING (91 journals)

ENGINEERING (1203 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
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: 34)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 302)
Propulsion and Power Research     Open Access   (Followers: 26)
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: 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: 47)
Remote Sensing Letters     Hybrid Journal   (Followers: 41)
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  
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: 33)
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: 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   (Followers: 1)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 51)
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: 19)
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  
Soft Computing     Hybrid Journal   (Followers: 8)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 72)
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: 3)
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  
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)
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 Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 6)
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: 35)
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: 65)
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: 35)
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: 6)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 13)
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)

  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  [2354 journals]
  • Metal oxide-embedded porous carbon nanoparticles as high-performance anode
           materials for lithium ion batteries
    • Authors: Xiaomei Wang; Wenwen Wang; Zhihong Zhu; Chao Yan; Qingtang Zhang
      Pages: 3255 - 3263
      Abstract: Conjugated microporous polymer (CMP) was used as a precursor to fabricate porous carbon nanoparticles (PCNs) embedded with different metal oxides (NiOx, CoOx, and MnOx). Rate performance tests indicate that 10% MnOx embedded PCNs (MnOx10-PCN) show superior rate performance over PCN. MnOx10-PCN and PCN were further investigated by XRD, XPS, TG, SEM, TEM, FT-IR, BET, cyclic voltammetry, and galvanostatic discharge–charge test. XRD and XPS results reveal that MnO and MnO2 phase co-exist in the MnOx10-PCN. SEM results indicate that both MnOx10-PCN and PCN are spherical particles with a size ranging from 20 to 50 nm. TEM results imply that MnOx nanoparticles are incorporated inside some porous carbon nanoparticles. FT-IR results indicate some residuary benzene rings remain in the MnOx10-PCN and PCN. BET analysis reveals that pore properties of MnOx10-PCN are very near to that of CMP. These unique features ensure MnOx10-PCN possesses high reversible capacity, excellent rate performance, and long cycling life. MnOx10-PCN delivers an initial reversible capacity of 986 mAh g−1 at 0.2 C. In addition, the capacity cycled at 2 C for 700 cycles is even higher than its original capacity.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2134-6
      Issue No: Vol. 23, No. 12 (2017)
       
  • Fabrication and electrochemical investigation of Li 0.5 TiO 2 as anode
           materials for lithium ion batteries
    • Authors: Yan Kuang; Yuxi Chen; Xiaohong Xia; Yuede He; Li Yang; Hongbo Liu
      Pages: 3265 - 3271
      Abstract: Hexagonal and cubic Li0.5TiO2 particles have been fabricated through magnesiothermic reduction of Li2TiO3 particles in a temperature range of 600 to 640 °C. The prolonged reduction time results in lattice transition from hexagonal to cubic structure of Li0.5TiO2. Their microstructures, valance state, chemical composition, as well as electrochemical performance as anode candidates for lithium ion batteries have been characterized and evaluated. The hexagonal Li0.5TiO2 exhibits better electrochemical activity compared with the cubic one. Further, the carbon-coated hexagonal Li0.5TiO2 displays improved electrochemical performance with initial reversible capacity of 176.6 mAh g−1 and excellent cyclic behavior except capacity fading in the initial 10 cycles, which demonstrate a novel anode candidate for long lifetime lithium ion batteries.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2148-0
      Issue No: Vol. 23, No. 12 (2017)
       
  • Porous NiO hollow quasi-nanospheres derived from a new metal-organic
           framework template as high-performance anode materials for lithium ion
           batteries
    • Authors: Junmin Xu; Haibing Tang; Tingting Xu; Di Wu; Zhifeng Shi; Yongtao Tian; Xinjian Li
      Pages: 3273 - 3280
      Abstract: Porous hollow metal oxides derived from nanoscaled metal-organic framework (MOF) have drawn tremendous attention due to their high electrochemical performance in advanced Li-ion batteries (LIBs). In this work, porous NiO hollow quasi-nanospheres were fabricated by an ordinary refluxing reaction combination of a thermal decomposition of new nanostructured Ni-MOF, i.e., {Ni3(HCOO)6·DMF}n. When evaluated as an anode material for lithium ion batteries, the MOF derived NiO electrode exhibits high capacity, good cycling stability and rate performance (760 mAh g−1 at 200 mA g−1 after 100 cycles, 392 mAh g−1 at 3200 mA g−1). This superior lithium storage performance is mainly attributed to the unique hollow and porous nanostructure of the as-synthesized NiO, which offer enough space to accommodate the dramstic volume change and alleviate the pulverization problem during the repeated lithiation/delithiation processes, and provide more electro-active sites for fast electrochemical reactions as well as promote lithium ions and electrons transfer at the electrolyte/electrode interface.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2160-4
      Issue No: Vol. 23, No. 12 (2017)
       
  • Enhanced electrochemical performance of lithium ion battery cathode Li 3 V
           2 (PO 4 ) 3 /C
    • Authors: Xumei Cui; Tiantian Liu; Xuefeng Zhang; Xia Xiang
      Pages: 3289 - 3293
      Abstract: Li-ion battery cathode material lithium-vanadium-phosphate Li3V2(PO4)3 was synthesized by a carbon-thermal reduction method, using stearic acid, LiH2PO4, and V2O5 as raw materials. And stearic acid acted as reductant, carbon source, and surface active agent. The effect of its content on the crystal structure and electrochemical performance of Li3V2(PO4)3/C were characterized by XRD and electrochemical performance testing, respectively. The results showed that the content of carbon source has no significant effect on the crystal structure of lithium vanadium phosphate. Lihtium vanadium phosphate obtained with 12.3% stearic acid demonstrated the best electrochemical properties with a typical discharge capacity of 119.4 mAh/g at 0.1 C and capacity retention behavior of 98.5% after 50 cycles. And it has high reversible discharge capacity of 83 mAh/g at 5 C with the voltage window of 3 to 4.3 V.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2128-4
      Issue No: Vol. 23, No. 12 (2017)
       
  • LiFePO 4 composites decorated with nitrogen-doped carbon as superior
           cathode materials for lithium-ion batteries
    • Authors: Yu Ding; Pei Pan; Lihui Chen; Zhengbing Fu; Jun Du; Liangui Guo; Feng Wang
      Pages: 3295 - 3302
      Abstract: The development of methods to synthesize electrode materials can improve the performance of lithium ion storage. In this study, a facile and low-cost approach is employed to synthesize LiFePO4 (LFP/NC) hybrid materials decorated with nitrogen-doped carbon nanomaterials (NC). Melamine was used as nitrogen and carbon source with an NC to LFP ratio of 3.19%. As electrode materials for lithium ion batteries (LIBs), the LFP/NC composites exhibit an optimum performance with a high rate capacity of 144.6 mAh·g−1 at 1 C after 500 cycles without apparent loss. The outstanding cycling stability may be attributed to the synergetic effects of well-crystallized particles and NC layers.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2137-3
      Issue No: Vol. 23, No. 12 (2017)
       
  • Synthesis and characterization of Li 3 V 2 (PO 4 ) 3 ·LiMn 0.33 Fe 0.67
           PO 4 /C cathode materials
    • Authors: Cheng Zhang; Xinyu Wang; Dejuan Zhang; Ibrayim Mihrigvl; Zhi Su
      Pages: 3303 - 3308
      Abstract: A new polyanionic cathode material, Li3V2(PO4)3·LiMn0.33Fe0.67PO4/C for lithium-ion batteries, was synthesized using a sol-gel method and with N,N-dimethyl formamide as a dispersion agent. The analysis of electron transmission spectroscopy and X-ray diffraction revealed that the composite contained two phases. The material has high crystallinity with a grain size of 20–50 nm. The valence states of Mn, V, and Fe in the composite were analyzed by X-ray photoelectron spectroscopy. The electrochemical kinetics in Li3V2(PO4)3 is effectively enhanced by the incorporation of LiMnPO4 and LiFePO4, via structure modification and reduced Li diffusion length. The Li3V2(PO4)3·LiMn0.33Fe0.67PO4/C materials displayed high rate capacity and steady cycle performance with discharge capacity remained 148 mAh g−1 after 50 cycles at the rate of 0.2C. In particular, the composite exhibited excellent reversible capacities, with the values of 157, 134, 120, 102, and 94 mAh g−1 at charge/discharge 0.2, 0.5, 1, 2, and 5C rates, respectively.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2157-z
      Issue No: Vol. 23, No. 12 (2017)
       
  • Facile template-free one-pot fabrication of ZnCo 2 O 4 nanospheres for
           advanced lithium storage capability
    • Authors: Zhe Chen; Feng Chen; Yonghe Wang; Yunxia Jiang
      Pages: 3323 - 3328
      Abstract: Large-scale ZnCo2O4 nanospheres with an average diameter of 350 nm were developed via a hydrothermal method. By adjusting the molar ratio of polyvinyl pyrrolidone (PVP), the ZnCo2O4 nanospheres can be facilely designed. Meanwhile, controlled experiment factors, namely the concentration of reagents, play important roles in the formation of the nanospheres. The possible mechanism for the nanostructures formation was discussed. In addition, when tested as anode materials for lithium-ion batteries, these ZnCo2O4 nanospheres have exhibited excellent lithium-storage performance.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2163-1
      Issue No: Vol. 23, No. 12 (2017)
       
  • Graphene and polydopamine double-wrapped porous carbon-sulfur cathode
           materials for lithium-sulfur batteries with high capacity and cycling
           stability
    • Authors: Yuan Dong; Run-Tian He; Li-Zhen Fan
      Pages: 3329 - 3337
      Abstract: Rechargeable lithium-sulfur batteries are deemed to be a promising energy supply to next-generation high energy power system, yet dissolution of lithium polysulfides in the electrolyte leads to poor cycling performance. Here, we report an approach to assemble graphene and polydopamine double-wrapped porous carbon/sulfur (GN-PD-PC-S) for lithium-sulfur batteries. Remarkably, the double-wrapping graphene and polydopamine further help confine the sulfur and polysulfides inside the mesopores and micropores of porous carbon. Moreover, the hierarchical porous structures provide a conductive network for electron transfer and facilitate the effective accommodation of the volume change of sulfur. The GN-PD-PC-S cathode presents an excellent cycling stability of 821 mAh g−1 after 100 cycles, with a favorable high-rate capability of 496 mAh g−1 at a current density of 2 A g−1. Our results indicate the importance of chemically synergistic effect of polymer and carbon in the electrode system for achieving high-performance electrodes in rechargeable lithium-sulfur batteries.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2138-2
      Issue No: Vol. 23, No. 12 (2017)
       
  • A free-standing and thermostable polymer/plastic crystal electrolyte for
           all-solid-state lithium batteries
    • Authors: Yuan Dong; Tianjie Ding; Li-Zhen Fan
      Pages: 3339 - 3345
      Abstract: All-solid-state lithium batteries using flexible solid electrolytes instead of combustible organic liquid electrolytes are the ultimate solution to address the safety problem of commercialized lithium ion batteries. In this study, a free-standing and thermostable polymer/plastic crystal composite electrolyte (PPCE) based on polymerized trimethylolpropane trimethacrylate (TMPTMA)-1, 6-hexanediol diacrylate (HDDA) matrix, and plastic crystal electrolyte was prepared for all-solid-state lithium batteries. The polymerized TMPTMA-HDDA-based matrix of a porous network structure coupled with plastic crystal electrolyte (PCE) in the pores reveals good compatibility. The as-synthesized PPCE possesses excellent flexible performance, thermostability, and high conductivity, showing that PPCE can reach 8.53 × 10−4 S cm−1 with 7.5 wt% monomers (PPCE-7.5%) at 25 °C under a stability electrochemical window above 5.2 V. The assembled lithium batteries Li PPCE LiFePO4 exhibit high capacity and highly cycling stability at room temperature, indicating great potential of all-solid-state lithium batteries.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2152-4
      Issue No: Vol. 23, No. 12 (2017)
       
  • Enhanced photosplitting of water using ultrathin cobalt sulfide
           nanoflakes-sensitized zinc oxide nanorods array
    • Authors: Mohit Prasad; Vidhika Sharma; Avinash Rokade; Perumal Ilaiyaraja; Sudakar Chandran; Sandesh Jadkar
      Pages: 3401 - 3408
      Abstract: We report synthesis and characterization of ultrathin cobalt sulfide nanoflakes (CoSx-NFs) sensitized zinc oxide nanorods (Z-NRs) array based thin films and their implementation as photoanodes for photoelectrochemical (PEC) splitting of water. Cobalt sulfide nanoflakes-sensitized zinc oxide nanorods (CoSx-NFs/Z-NRs) array based photoanodes were grown on fluorine-doped tin oxide substrate by a simple and versatile electrodeposition method. Maximum conversion efficiency of PEC cell was found 0.37% with a photocurrent density of 0.48 mA/cm2 at a bias of 0.3 V/SCE in CoSx-NFs/Z-NRs-15 (loading of CoSx-NFs on Z-NRs by cyclic voltammetry for 15 cycles) based photoanodes. The photo-activity is 2.7 times larger than that of Z-NRs array-based photoanode. Experimental results reveal that sensitization by CoSx-NFs causes red shift in the band gap energy of Z-NRs photoanode. Lower band gap energy, suitable band redox potential, and marked absorption in visible light make CoSx-NFs/Z-NRs-15 thin films a promising material for photoanodes in PEC cells. A detailed analysis using X-ray diffraction (XRD), UV-Visible (UV-Visible) spectroscopy, field emission scanning electron microscope (FE-SEM), energy-dispersive analysis (EDX), electron impedance spectroscopy (EIS), Mott-Schottky (MS) analysis, applied bias photon-to-current conversion efficiency (ABPE), and incident photon to current conversion efficiency (IPCE) measurements has been carried out to substantiate our observations. The excellent performance of CoSx-NFs/Z-NRs allows the composite photoelectrode to have many potential applications as a photoanode material for H2 production, nanoflakes-sensitized solar cells, and UV photodetector.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2131-9
      Issue No: Vol. 23, No. 12 (2017)
       
  • In situ conversion of manganese carbonate to manganese oxide/hydroxide and
           its supercapacitive analysis in aqueous KOH solution
    • Authors: Amit Kumar; Yogesh Sharma
      Pages: 3409 - 3418
      Abstract: MnCO3 is considered to be a promising electrode material for supercapacitor (SC) and found to be a good material for supercapacitive performance than their counterpart manganese oxides. But the energy storage mechanism of MnCO3 in KOH aqueous solution is not known yet. Hence, in the present work, we have made an attempt to understand the involved energy storage mechanism for MnCO3. MnCO3 with submicron-sized particles are synthesized by simple, cost-effective co-precipitation method at ambient conditions and examined as electrode material for SC application by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) in 2 M KOH electrolyte. To investigate the reason for charge storage mechanism, ex-situ X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) analysis were performed at the different stages of charges/discharge for MnCO3 in KOH electrolyte and a plausible energy storage mechanism is proposed. Hexagonal-MnCO3 transforms to respective oxide/hydroxide once it comes in contact with KOH solution. At the end of 2 h reaction time, Mn(OH)2 transforms to Mn3O4; however, complete transformation of Mn(OH)2 to Mn3O4 only occurred when external positive potential was applied. All these results were supported by studying pH and potential influence in the line of well known Pourbaix diagram. Considering all results presented in this manuscript, it is clearly observed that MnCO3 does not perform the electrochemical charge-discharge cycling, but it transforms completely to Mn3O4 in the first or second cycle, and thereafter, Mn3O4 does perform the reversible electrochemical charge-discharge cycling to enable high and stable capacitance.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2146-2
      Issue No: Vol. 23, No. 12 (2017)
       
  • Thermal and electrical properties of Ce 0.8-x Pr x Sm 0.2 O 2-δ
           electrolyte materials for IT-SOFC applications
    • Authors: V. Venkatesh; C. Vishnuvardhan Reddy
      Pages: 3455 - 3467
      Abstract: Praseodymium and samarium co-doped ceria-based electrolyte materials Ce0.8-x Pr x Sm0.2O2-δ (0≤ x ≤0.06) were prepared by using the sol–gel method. The phase identification and morphology were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The thermal expansion properties were studied by using a dilatometric technique, and it was observed that the thermal expansion coefficient (TEC) varies linearly with temperature for all the samples in the temperature range 30–1000 °C. The electrical conductivity was studied using impedance spectroscopy, and it was observed that the Ce0.74Pr0.06Sm0.2O2-δ composition showed higher electrical conductivity and lower activation energy, and constant phase element (CPE) equivalent circuit was fitted at 450 °C. This composition, because of its unique properties, may find applications in the intermediate-temperature solid oxide fuel cell (IT-SOFC) as an electrolyte.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2129-3
      Issue No: Vol. 23, No. 12 (2017)
       
  • A ZnO/PVA/PAADDA composite electrode for rechargeable zinc-air battery
    • Authors: Liang Zhou; Debi Zhou; Wengang Gan; Zejie Zhang
      Pages: 3469 - 3477
      Abstract: A ZnO/PVA/PAADDA composite electrode for rechargeable zinc-air battery was prepared by chemical cross-linked PVA (polyvinyl alcohol) with poly(acrylamide-co-diallyldimethylammonium chloride) (PAADDA). Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), and transmission microscopy (TEM) studies reveal that the PVA/PAADDA polymer had a well-connected three-dimensional network structure. Linear sweep voltammetry, cyclic voltammetry (CV), electrochemical impedance spectroscopies (EIS), and charge/discharge cycling tests were carried out on the ZnO/PVA/PAADDA electrode, which shows much better electrochemical activity and capacity stability comparing with the bare ZnO electrode without polymer.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2150-6
      Issue No: Vol. 23, No. 12 (2017)
       
  • Determination of levodopa in the presence of uric acid using a ZnO
           nanoflower-modified indium tin oxide glass electrode
    • Authors: Hong Yan Yue; Bao Wang; Shuo Huang; Xin Gao; Xuan Yu Lin; Long Hui Yao; En Hao Guan; Hong Jie Zhang; Shan Shan Song
      Pages: 3479 - 3486
      Abstract: ZnO nanoflowers (ZnONFs) were synthesized by a simple hydrothermal method which is a convenient, environment-friendly, inexpensive process. The ZnONF suspension was sprayed onto the surface of ITO-coated glass (ZnONFs/ITO), which acts as the working electrode for the determination of levodopa by cyclic voltammetry and differential pulse voltammetry. The effect of reaction regents on the sizes of ZnONFs was investigated. The morphologies and structure of ZnONFs were characterized by scanning electron microscopy and X-ray diffraction analysis, respectively. The results show that the optimized length and diameter of ZnONFs are ~2.5 μm and 50 nm, respectively. The sensitivity and measured limit of detection of the ZnONFs/ITO electrode for levodopa are 0.10 μA/μM and 2.5 μM in the range of 2.5–40 μM, respectively. The electrode can accurately detect levodopa in the presence of uric acid. Meanwhile, the electrode shows good repeatability and stability.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2153-3
      Issue No: Vol. 23, No. 12 (2017)
       
  • Electrochemical sensor based on a sepiolite clay nanoparticle-based
           electrochemical sensor for ascorbic acid detection in real-life samples
    • Authors: Melike Pekin; Dilek Eskiköy Bayraktepe; Zehra Yazan
      Pages: 3487 - 3495
      Abstract: A new electrode composed of sepiolite clay (SC) carbon paste (CP) was developed and used for the adsorptive stripping differential pulse voltammetric quantification of ascorbic acid (AA). The effects of pH, the ratios of the electrode ingredients, accumulation potential, and accumulation time were investigated. The SC/CP electrode (SC/CPE) was found to have a good linear working range (1.4 × 10−8–9.0 × 10−7 mol L−1) and the detection limit of 4.2 × 10−9 mol L−1. The sensitivity is fairly good with LOQ of 0.014 μmol L−1 and LOD of 0.0042 μmol L−1. The selectivity in the presence of some common species, i.e., Na+, Cl−, Ca2+, Mg2+, NO3 − , citric acid, and glucose, at concentrations well above those encountered in body fluids was found to be satisfactory. The SC/CPE system has a lifetime not shorter than a month and proved to be practical for the analysis of not only pharmaceutical formulations but also natural products such as vitamin C-rich fruit Rosa canina and mineral waters.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2132-8
      Issue No: Vol. 23, No. 12 (2017)
       
  • Amperometric nitrite sensor based on free-standing carbon
           nanotube/methylene blue composite paper
    • Authors: Tuğba Ömür; Murat Alanyalıoğlu
      Pages: 3507 - 3516
      Abstract: Free-standing paper-like electrochemical sensors have many advantages such as high flexibility, thickness adjustability, and large electroactive surface area, when compared to traditional metal electrodes. Generally, carbon nanomaterials, e.g., graphene and carbon nanotubes (CNTs), are main materials of paper-like sensors, and these materials are supported by different species such as metal nanoparticles, dyes, and polymers. We present the fabrication procedure of free-standing composite paper electrode including CNTs and methylene blue (MB) with a simple vacuum filtration process of a suspension including oxidized CNTs (CNTs-ox) and MB through a suitable membrane. CNTs-ox/MB paper was peeled from membrane, and this paper was electrochemically reduced to improve its electrical conductivity. Characterization of this paper-like electrode was performed by using scanning electron microscopy, scanning tunneling microscopy, electron-dispersive X-ray analysis, powder X-ray diffraction spectroscopy, Raman spectroscopy, UV-vis absorption spectroscopy, four-point probe electrical conductivity, and cyclic voltammetry techniques. Amperometric response of the composite paper electrode for determination of nitrite was linearly proportional to nitrite amount in the range of 12–2500 μM, with a detection limit of 3.6 μM. The sensitivity of the free-standing CNTs/MB paper sensor was calculated as 0.40 μA μM−1 cm−2.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2142-6
      Issue No: Vol. 23, No. 12 (2017)
       
  • Influence of ZnO growth temperature on the performance of dye-sensitized
           solar cell utilizing TiO 2 -ZnO composite film photoanode
    • Authors: S. A. M. Samsuri; M. Y. A. Rahman; A. A. Umar; M. M. Salleh
      Pages: 3533 - 3544
      Abstract: TiO2 nanoflower (NF)-ZnO composite films were synthesized by using liquid phase deposition (LPD) and dip coating method. At the lower growth temperature below 50 °C, the morphology of the sample is nanoflower, while at the temperature above 50 °C, the morphological shape of nanoparticle was obtained. The diameter of ZnO nanoparticle decreases 21.0% with the growth temperature. The thickness of the sample increases with growth temperature until the optimum temperature of 50 °C. The absorption of the uncoated dye samples is about the same. The decrease percentage of absorption for the coated dye samples is 15.0%. The dye-sensitized solar cell utilizing the TiO2-ZnO composite synthesized at 30 °C demonstrated the highest photovoltaic performance with η = 0.63 ± 0.02%, J sc = 1.91 ± 0.05 mA cm−2, and V oc = 0.64 ± 0.02 V due to the highest optical absorption, lowest leak current, highest dye loading, smallest bulk resistance (R s), highest recombination resistance (R cr), and longest charge carrier lifetime (τ).
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2139-1
      Issue No: Vol. 23, No. 12 (2017)
       
  • Adapting the ionic transfer behavior of cation exchange membrane
           incorporated with SiO 2 /PAA composite nanoparticles
    • Authors: M. Nemati; S. M. Hosseini
      Pages: 3555 - 3564
      Abstract: In this study, silicon dioxide nanoparticles (SiO2 NPs) were functionalized by polyacrylic acid (PAA) then used as the modifier agent in polyvinyl chloride (PVC)-based heterogeneous cation exchange membranes (CEMs). FTIR technique and SEM images were employed to characterize the synthesized SiO2/PAA. All the experiments were carried out at ambient condition. According to the experiments, CEMs modified by SiO2/PAA have more hydrophilic and smoother surface. Membrane water content reduced from 32.2% for the base membrane to 20.1% for modified membrane containing 4.0%wt SiO2/PAA. Modified CEMs showed an improved potential, transport number, selectivity, and electrical conductivity. The selectivity of modified membrane (containing 0.5%wt SiO2/PAA) is 87.3%, and its electrical conductivity is about 37% less than the base membrane. The mechanical stability of prepared membranes was also improved about 25.4%. Moreover, sodium flux increased sharply (21%) loading 0.5%wt NPs in the structure and then reduced by more SiO2/PAA concentration. In addition, membrane ionic flux decreased obviously for bivalent ions by using SiO2/PAA nanoparticles. The prepared membranes showed higher permeability/flux for monovalent ions compared to bivalent type.
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2159-x
      Issue No: Vol. 23, No. 12 (2017)
       
  • Magnetic field effect on Zn-Co alloy electroplating
    • Authors: H. Kermoune; A. Levesque; J. Douglad; R. Rehamnia; J. P. Chopart
      Pages: 3565 - 3570
      Abstract: Zinc-cobalt (Zn-Co) alloys were electrodeposited under a magnetic field parallel to the electrode from a sulfate bath. These alloys were investigated using chronopotentiometric measurement as one of the well-known galvanostatic techniques. The magnetic field was found to shift the potential of electrodeposition of alloys toward anodic values. The Zn-Co electrochemical impedance spectroscopy studies clearly showed the effects of the magnetic field on the electrodeposition process. The crystallographic structures of the deposits examined by X-ray diffraction (XRD) revealed the existence of CoZn13 phase, pure zinc phase, and η phase. The presence and absence of each of the phases were found to be greatly dependent on both the electrolyte composition and on the magnetic field amplitude and the latter of which also affected the lattice cell parameters. Indeed, an increase in the magnetic field amplitude decreases the size of the grains. These results were confirmed by morphological study using scanning electron microscopy (SEM).
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2156-0
      Issue No: Vol. 23, No. 12 (2017)
       
  • Facile fabrication of selenium (Se) nanowires for enhanced lithium storage
           in Li-Se battery
    • Authors: Chang Wang; Qing Hu; Yao Wei; Dong Fang; Weilin Xu; Zhiping Luo
      Pages: 3571 - 3579
      Abstract: A cost-effective facile approach has been developed to prepare Se nanowires in anodic aluminum oxide (AAO) nanochannels by a mechanical injection method, which enables injection of molten Se into the AAO template to form nanowires during solidification. The as-synthesized Se nanowires display well crystallized as a single phase with a hexagonal structure. In addition, thermal stability and electrochemical properties of Se nanowires were presented and discussed in detail. It was found that the Se nanowires used as a cathode material of Li-Se battery displayed enhanced chemical reaction processes with lithium ions, with a higher storage capacity of 1425.6 mAh g−1 compared with the capacity of bulk Se cathode with 454 mAh g−1 at a current density of 150 mA g−1. The current method of synthesizing nanowires is feasible for other pure elements and their compounds with relatively lower melting points (<650 °C).
      PubDate: 2017-12-01
      DOI: 10.1007/s11581-017-2164-0
      Issue No: Vol. 23, No. 12 (2017)
       
 
 
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