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  Subjects -> ENGINEERING (Total: 2383 journals)
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ENGINEERING (1248 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Polymers for Advanced Technologies     Hybrid Journal   (Followers: 3)
Popular Science     Full-text available via subscription   (Followers: 32)
Power Engineer     Hybrid Journal   (Followers: 3)
Power Technology and Engineering     Hybrid Journal   (Followers: 3)
Practical Machinery Management for Process Plants     Full-text available via subscription  
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management     Full-text available via subscription  
Precision Engineering     Hybrid Journal   (Followers: 34)
Probability in the Engineering and Informational Sciences     Hybrid Journal   (Followers: 1)
Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa / Problems of Mechatronics. Armament, Aviation, Safety Engineering     Open Access   (Followers: 1)
Procedia CIRP     Open Access   (Followers: 3)
Procedia Engineering     Open Access   (Followers: 3)
Procedia IUTAM     Open Access  
Procedia Technology     Open Access  
Proceedings of Engineering and Technology Innovation     Open Access  
Proceedings of the IEEE     Hybrid Journal   (Followers: 94)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Engineering Sustainability     Hybrid Journal   (Followers: 5)
Proceedings of the Institution of Civil Engineers - Forensic Engineering     Hybrid Journal  
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering     Hybrid Journal   (Followers: 10)
Proceedings of the Institution of Civil Engineers - Ground Improvement     Hybrid Journal   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 9)
Proceedings of the Institution of Civil Engineers - Maritime Engineering     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 2)
Proceedings of the Institution of Civil Engineers - Transport     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Waste and Resource Management     Hybrid Journal   (Followers: 1)
Process Metallurgy     Full-text available via subscription   (Followers: 3)
Process Safety Progress     Hybrid Journal   (Followers: 7)
Process Systems Engineering     Full-text available via subscription   (Followers: 1)
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: 4)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 10)
Progress in Agricultural Engineering Sciences     Full-text available via subscription   (Followers: 1)
Progress in Computational Fluid Dynamics, An International Journal     Hybrid Journal   (Followers: 7)
Progress in Energy and Combustion Science     Full-text available via subscription   (Followers: 11)
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: 37)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 343)
Propulsion and Power Research     Open Access   (Followers: 35)
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: 10)
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  
Remote Sensing     Open Access   (Followers: 48)
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: 9)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 18)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 29)
Respuestas     Open Access  
Review of Symbolic Logic     Full-text available via subscription   (Followers: 1)
Reviews in Advanced Sciences and Engineering     Partially Free   (Followers: 1)
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 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)
Revista Tecnología en Marcha     Open Access  
Revista UIS Ingenierías     Open Access  
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: 37)
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 in Context     Hybrid Journal   (Followers: 2)
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 3)
Sciences & Technologie B : Sciences de l'ingénieur     Open Access  
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: 2)
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: 50)
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: 4)
Shock and Vibration     Hybrid Journal   (Followers: 14)
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: 12)
Smart Grid     Open Access   (Followers: 1)
Soft Computing     Hybrid Journal   (Followers: 7)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 74)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 14)
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: 2)
SourceOECD Urban, Rural and Regional Development     Full-text available via subscription  
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: 4)
Sports Engineering     Hybrid Journal   (Followers: 2)
Stahlbau     Hybrid Journal   (Followers: 2)
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: 3)
Studies in Engineering and Technology     Open Access  
Studies in Interface Science     Full-text available via subscription  
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: 3)
Surface Engineering     Hybrid Journal   (Followers: 1)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 20)
Surfaces and Interfaces     Hybrid Journal  
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: 3)
Sustainability Science     Hybrid Journal   (Followers: 9)
Sustainability Science and Engineering     Full-text available via subscription   (Followers: 3)
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: 4)
Synthesis Lectures on Energy and the Environment: Technology, Science, and Society     Full-text available via subscription   (Followers: 1)
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: 5)
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: 8)
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: 7)
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)

  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  [2350 journals]
  • Mechanical behavior of Li-ion-conducting crystalline oxide-based solid
           electrolytes: a brief review
    • Authors: Jeff Wolfenstine; Jan L. Allen; Jeff Sakamoto; Donald J. Siegel; Heeman Choe
      Pages: 1271 - 1276
      Abstract: Li-ion-conducting solid electrolytes are receiving considerable attention for use in advanced batteries. These electrolytes would enable use of a Li metal anode, allowing for batteries with higher energy densities and enhanced safety compared to current Li-ion systems. One important aspect of these electrolytes that has been overlooked is their mechanical properties. Mechanical properties will play a large role in the processing, assembly, and operation of battery cells. Hence, this paper reviews the elastic, plastic, and fracture properties of crystalline oxide-based Li-ion solid electrolytes for three different crystal structures: Li6.19Al0.27La3Zr2O12 (garnet) [LLZO], Li0.33La0.57TiO3 (perovskite) [LLTO], and Li1.3Al0.3Ti1.7(PO4)3 (NaSICON) [LATP]. The experimental Young’s modulus value for (1) LLTO is ~ 200 GPa, (2) LLZO is ~ 150 GPa, and (3) for LATP ~ 115 GPa. The experimental values are in good agreement with density functional theory predictions. The fracture toughness value for all three of LLTO, LLZO, and LATP is approximately 1 MPa m−2. This low value is expected since, they all exhibit at least some degree of covalent bonding, which limits dislocation mobility leading to brittle behavior.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2314-4
      Issue No: Vol. 24, No. 5 (2018)
  • Electrochemical properties of Li 3 V 2 (PO 4 ) 3 /C cathode materials
           synthesized via ethylene glycol-assisted solvothermal method
    • Authors: JianHong Peng; HaiPing Bao; XiaoLong Xu; Hao Wang; Hulin Dong; LeiChao Meng; Cong Chen; DuoLu Mao; HaiQin Li
      Pages: 1277 - 1283
      Abstract: The Li3V2(PO4)3/C (LVP/C) cathode materials for lithium-ion batteries were synthesized via ethylene glycol-assisted solvothermal method. The phase composition, phase transition temperature, morphology, and fined microstructure were studied using X-ray diffraction (XRD), differential thermal analyzer (DTA), scanning electron microscope (SEM), and transmission electron microscope (TEM), respectively. The electrochemical properties, impedance, and electrical conductivity of LVP/C cathode materials were tested by channel battery analyzer, the electrochemical workstation, and the Hall test system, respectively. The results shown that the appropriate amount of water added to ethylene glycol solvent contributes to the synthesis of pure phase LVP. The LVP10/C cathode material can exhibit discharge capacities of 128, 126, 126, 123, 124, and 114 mAh g−1 at 0.1, 0.5, 2, 5, 10, and 20 C in the voltage range of 3.0–4.3 V, respectively. Meanwhile, it shows also a stable cycling performance with the capacity retention of 89.6% after 180 cycles at 20 C.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2312-6
      Issue No: Vol. 24, No. 5 (2018)
  • Effects of heating rate on morphology and performance of lithium iron
           phosphate synthesized by hydrothermal route in organic-free solution
    • Authors: Changqing Min; Xiuqin Ou; Zhixiang Shi; Guangchuan Liang; Li Wang
      Pages: 1285 - 1292
      Abstract: Flake-like LiFePO4 were hydrothermally synthesized in an organic-free solution at heating rates of 0.5, 1.5, 3, and 5 °C min−1. The heating rate has a marked influence on crystal morphology but scarcely on phase purity. The reason for morphology variations is discussed based upon the solubility of precursors Li3PO4 and Fe3(PO4)2·8H2O. The optimum heating rate for hydrothermal synthesis of LiFePO4 is 3 °C min−1. The as-synthesized material exhibits a high specific capacity, excellent rate capability, good low-temperature performance and Li+ diffusivity after carbon coating, all of which could be ascribed to shortened Li+ diffusion distance and higher crystallization degree of the crystalline.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2287-3
      Issue No: Vol. 24, No. 5 (2018)
  • AC and DC conductivity study of LiH 2 PO 4 compound using impedance
    • Authors: T. Rhimi; G. Leroy; B. Duponchel; K. Khirouni; S. Guermazi; M. Toumi
      Pages: 1305 - 1312
      Abstract: The lithium dihydrogen phosphate LiH2PO4 has been investigated by X-ray powder diffraction, scanning electron microscopy (SEM), and electrical impedance spectroscopy. The Rietveld refinements based on the XRD patterns show that the compound is crystallized in the orthorhombic system with Pna21 space group, and the refined unit cell parameters are a = 6.2428 Å, b = 7.6445 Å, and c = 6.873 Å. The electrical properties were studied using complex impedance spectroscopy as a function of frequency (104–107 Hz) at various temperatures (300–400 K). The Nyquist plots are well fitted to an equivalent circuit consisting of a series of combination of grains and inhomogeneous electrode surface effect. The frequency dependence of the conductivity is interpreted in terms of Jonscher’s law. Moreover, the near value of the activation energies obtained from the equivalent circuit and analysis of M″ confirms that the transport is through ion hopping mechanism dominated by the motion of the proton in the structure of the investigated material.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2306-4
      Issue No: Vol. 24, No. 5 (2018)
  • Graphene-Co/CoO shaddock peel-derived carbon foam hybrid as anode
           materials for lithium-ion batteries
    • Authors: Rihui Zhou; Yaqin Chen; Yuanyuan Fu; Yanfei Li; Shouhui Chen; Yonghai Song; Li Wang
      Pages: 1321 - 1328
      Abstract: A novel graphene (G)-Co/CoO shaddock peel-derived carbon foam (SPDCF) hybrid was fabricated as anode materials for lithium-ion batteries. The preparation of G-Co/CoO SPDCF was according to the following two steps. Firstly, the dried shaddock peels were immersed into the mixture of Co(NO3)2/graphene oxide for about 12 h. Then, the shaddock peels were taken out and heated at 800 °C for 2 h under N2 atmosphere. The strategy is simple, low-cost, and environmentally friendly because the shaddock peel is abundant and renewable. The obtained G-Co/CoO SPDCF hybrid were carefully characterized by SEM, EDS, XPS, XRD, TGA, BET, TEM, and electrochemical techniques. The results showed that the carbonized shaddock peels had hierarchical porous nanoflakes structures and graphene was uniformly dispersed into the SPDCF. The nanosized Co/CoO was formed on the G-SPDCF. The resulted G-Co/CoO SPDCF hybrid could maintain a high capacity of 600 mA h g−1 at 0.2 A g−1 after 80 cycles, which was much higher than that of commercial graphite (372 mA h g−1). The enhanced performance might be ascribed to the existence of lots of uniform Co/CoO and the hierarchical G-SPDCF alleviating the mechanical stress during the process of lithiation/delithiation.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2294-4
      Issue No: Vol. 24, No. 5 (2018)
  • Fabrication of urchin-like NiCo 2 O 4 microspheres assembled by using SDS
           as soft template for anode materials of Lithium-ion batteries
    • Authors: Yehua Li; Xianwen Wu
      Pages: 1329 - 1337
      Abstract: In this paper, the urchin-like NiCo2O4 microspheres assembled by using sodium dodecyl sulfate (SDS) as soft template are successfully fabricated by a facile procedure including microemulsion-solvothermal reaction and subsequent calcination at 400 °C for 4 h. The structure and morphology of synthesized NiCo2O4 particles are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It has been clearly revealed that the prepared three-dimensional urchin-like NiCo2O4 microspheres are constituted by one-dimension nanowires. As it is applied to anode for lithium-ion batteries (LIBs), the initial coulombic efficiency is up to 75.7%, and the specific reversible capacity retains up to 1034.2 mAh/g even after 40 cycles at a current density of 100 mA/g. Furthermore, as the current density gradually increases to 800 mA/g, it still delivers the reversible capacity of 895.4 mAh/g. The high reversible specific capacity, perfect cyclability, and rate performance are attributed to the unique urchin-like NiCo2O4 microspheres, which can alleviate the volume expansion and shorten the diffusion path of ions and electrons during lithiation/delithiation process. The self-standing urchin-like NiCo2O4 microspheres may be a very promising candidate in place of the commercial graphite-based anode materials for high-performance LIBs.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2291-7
      Issue No: Vol. 24, No. 5 (2018)
  • Effect of doping functionalized MWCNTs on the electrochemical performances
           of Li 2 CoSiO 4 for lithium-ion batteries
    • Authors: Savitha Thayumanasundaram; Vijay Shankar Rangasamy; Jin Won Seo; Jean-Pierre Locquet
      Pages: 1339 - 1347
      Abstract: We report the synthesis of Li2CoSiO4 by the sol-gel method and the preparation of a composite electrode by incorporating functionalized multi-walled carbon nanotubes (fn. MWCNTs) as conductive additive. XRD pattern of the composite confirms the structural stability of Li2CoSiO4 even after the addition of fn. MWCNTs. SEM images of the composite reveal the presence of conductive bridges formed by MWCNTs between the submicron-sized particles of Li2CoSiO4. The cyclic voltammograms of the composite cathode show redox peaks with higher current density than pure Li2CoSiO4 and the current density increases with increase in sweep rate. The diffusion coefficient of lithium has been improved by the addition of fn. MWCNTs from 1 × 10−14 to 8 × 10−14 cm2/s as calculated using Randles-Sevcik equation. The charge-discharge cycling performance of both pure Li2CoSiO4 and composite cathode has been discussed.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2313-5
      Issue No: Vol. 24, No. 5 (2018)
  • Transport phenomena in superionic Na х Cu 2 − х S ( х  = 0.05;
           0.1; 0.15; 0.2) compounds
    • Authors: M. Kh. Balapanov; R. Kh. Ishembetov; K. A. Kuterbekov; M. M. Kubenova; R. F. Almukhametov; R. A. Yakshibaev
      Pages: 1349 - 1356
      Abstract: The electronic and ionic conductivity, the electronic and ionic Seebeck coefficients, and the thermal conductivity of Na x Cu2 − x S (x = 0.05, 0.1, 0.15, 0.2) compounds were measured in the temperature range of 20–450 °С. The total cationic conductivity of Na0.2Cu1.8S is about 2 S/cm at 400 °С (the activation energy ≈ 0.21 eV). Over the studied compounds, the composition Na0.2Cu1.8S has the highest electronic conductivity (500–800 S/cm) in the temperature range from 20 to 300 °С, and the highest electronic Seebeck coefficient (about 0.2 mV/K) in the same temperature range is observed for Na0.15Cu1.85S composition; the electronic Seebeck coefficient increases abruptly above 300 °С for all compounds. The thermal conductivity of superionic Na0.2Cu1.8S is low, which causes high values of the dimensionless thermoelectric figure of merit ZT from 0.4 to 1 at temperatures from 150 to 340 °С.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2299-z
      Issue No: Vol. 24, No. 5 (2018)
  • Structure and transport properties of AgI–AgCl–CsCl glasses:
           molecular dynamics study
    • Authors: Shigeki Matsunaga
      Pages: 1371 - 1376
      Abstract: Molecular dynamics (MD) simulation have been performed to investigate the structure and transport properties of molten and glass state of silver alkali halide, AgI–AgCl–CsCl. The screened Born-Mayer type potentials including the polarizability of ions have been used in MD. The temperature dependence of the structure, conductivity, share viscosity, and relaxation times have been discussed by MD results. Electrical density of states for molten and glass states have also been examined using ab initio calculation.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2302-8
      Issue No: Vol. 24, No. 5 (2018)
  • Elastic, electronic structure, and optical properties of orthorhombic Na 3
           AlF 6 : a first-principles study
    • Authors: Jianhua Liu; Libo Zhang; Lei Xu
      Pages: 1377 - 1383
      Abstract: First-principles investigation of elastic, electronic, and optical properties of orthorhombic Na3AlF6 has been carried out by DFT using plane-wave pseudo-potentials within the LDA and GGA. Calculated lattice parameters agree well with experimental results. From calculated elastic constants, Na3AlF6 is a mechanically stable anisotropic and behaves in a ductile manner. Electronic structure analysis indicates that Na3AlF6 behaves as an insulator with a direct band gap of 6.065 eV in LDA and 5.868–5.949 eV in GGA. DOS, population analysis, and charge densities difference indicate that Al-F bonds are mainly ionic as well as partially covalent due to the hybridization of F-2p and Al-3s (3p) states. Moreover, the imaginary part of calculated dielectric function ε2(ω) shows three prominent peaks due to the inter band transitions F 2p states→Na 3s states. From calculated ε (ω), other optical properties such as reflectivity and refractive index are also obtained up to the photon energy range of 40 eV.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2285-5
      Issue No: Vol. 24, No. 5 (2018)
  • Single-ion conductivity enhancement for the composite polymer electrolytes
           based on Li(PVAOB)/PPEGMA for lithium-ion batteries
    • Authors: Ali Murat Soydan; Ayhan Bozkurt
      Pages: 1399 - 1405
      Abstract: In the present work, a series of single-ion conducting composite polymer electrolytes based on lithium polyvinyl alcohol oxalate borate (Li(PVAOB)) and poly(polyethylene glycol methacrylate) (PPEGMA) were produced. PEGMA was polymerized into PPEGMA, and the Li(PVAOB) was prepared from poly (vinyl alcohol) (PVA), oxalic acid, and boric acid. Li(PVAOB) was blended with PPEGMA at different stoichiometric ratios to obtain a single-ion conducting system. All the electrolytes were characterized by Fourier transformation infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), differential scanning calorimeter (DSC), and scanning electron microscopy (SEM) techniques. These results verified the interaction between host and guest polymers, sufficient thermal stability within the measured conductivity domain, and the homogeneity of the composite electrolytes. The effect of PPEGMA onto the ionic conductivity was investigated using impedance spectroscopy. The Li(PVAOB)-60PPEGMA is the optimum content, and this sample has a maximum ionic conductivity of 3 × 10−4 S/cm at 100 °C which is approximately five orders of magnitude higher than neat Li(PVAOB). Activation energy (E a ) of ionic transport decreased from 11.9 to 0.27 kJ/mol, suggesting a much faster ionic mobility for higher PPEGMA-containing samples.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2286-4
      Issue No: Vol. 24, No. 5 (2018)
  • Electrochemical performance of plasticized PEO-LiTf complex-based
           composite gel polymer electrolytes with the addition of barium titanate
    • Authors: A. J. Nagajothi; R. Kannan; S. Rajashabala
      Pages: 1407 - 1414
      Abstract: Gel electrolytes and solid electrolytes have been reported as a potential element to slow down the polysulfide shuttle by reducing its mobility in the electrolytes. The preparation of sulfur-conductive polymer composites, or sulfur-carbon composites, has been reported as softening the impact of the shuttle effects. Unlike Li-ion batteries so far, no electrolyte is found to be optimal for Li–S batteries at all conditions. Taking into account all these factors, in the present study, an attempt has been made to develop solid polymer electrolytes in conjunction with non-aqueous liquid electrolytes along with inert fillers for Li–S batteries. Poly-ethylene oxide (PEO)-based composite gel polymer electrolytes (CGPE) comprising a combination of plasticizers, namely 1,3-dioxolane (DIOX)/tetraethylene glycol dimethylether (TEGDME) and a lithium salt (LiTf) with the addition of ceramic filler, barium titanate (BaTiO3) have been prepared using a simple solution casting technique in an argon atmosphere. The as-prepared polymer electrolyte films were subjected to SEM, ionic conductivity, TG/DTA, and FTIR analyses. A symmetric cell composed of Li/CGPE/Li was assembled, and the variation of interfacial resistance as a function of time was also measured. The ionic conductivity was found to be increased as a function of temperature. The lithium transference number (Lit +) was measured, and the value was calculated as 0.7 which is sufficient for battery applications. The electrochemical stability window of the sample was studied by linear sweep voltammetry, and the polymer electrolyte film was found to be stable up to 5.7 V. The TG/DTA analysis reveals that this CGPE is thermally stable up to 350 °C. The compatibility studies exhibited that CGPE has better interracial properties with lithium metal anode. The interaction between the PEO and salt has been identified by an FTIR analysis.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2307-3
      Issue No: Vol. 24, No. 5 (2018)
  • Discriminating hazardous gas mixture via a zirconia-based amperometric gas
    • Authors: Fu-an Li; Jie Zou; Xin Zhang; Dongxing Zhang; Han Jin; Jinxia Wang; Jiawen Jian
      Pages: 1451 - 1456
      Abstract: Unsatisfactory sensing selectivity remains a challenging issue for zirconia-based gas sensors and severely restrains their wide application. In view of the response selectivity for the amperometric sensor can be simply controlled by the applied bias voltage, we proposed the following strategy: operating the sensor at various bias voltage and disparate response patterns is expected; through processing these response patterns with pattern recognition algorithm, response selectivity of the sensor would be further promoted. Interestingly, research results indicate that bias voltage remarkably affects the electrocatalytic activity to each examined hazardous gas and indirectly controls the sensing behavior of the resultant sensor. In combining with principle component analysis algorithm, the sensor operated at different bias voltage (− 75, 0, 35, and 75 mV) demonstrates acceptable performance in discriminating hazardous gas. Such satisfactory sensing behavior discloses the potential future of differentiating gas mixture with an amperometric gas sensor by simply adjusting the applied bias voltage.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2297-1
      Issue No: Vol. 24, No. 5 (2018)
  • Thermodynamic and kinetic investigation for peroxide hydrogen reduction
           reaction on nanoporous electrocatalysts
    • Authors: Yan Zhang; Yuanyuan Zhao; Shuai Shi; Miaomiao Tian; HuiMing Yin
      Pages: 1457 - 1465
      Abstract: Owing to the unique three-dimensional bi-continuous (pore and ligament) structure of nanoporous metals, active sites and electron conduction are both promoted for electrocatalytic reactions. However, the narrowing pore sizes for increasing surface areas provide more active sites but hindered mass diffusion. Therefore, there are optimal values for the ligament and pore size of nanoporous metal electrocatalysts. As an outstanding electrocatalyst towards hydrogen peroxide reduction reaction (HPRR), the structure features of nanoporous gold (NPG) were investigated in detail by using electrochemical techniques, e.g., rotating disk electrode (RDE) in this paper. The experimental results demonstrated that residual silver in NPG did not afford a positive effect for HPRR although exhibiting good catalytic activity alone. Furthermore, by comparing the thermodynamic and kinetic properties of NPG samples with various ligament/pore sizes, NPG electrocatalyst with pore size of ~ 30 nm exhibited an optimal catalytic activity and stability for HPRR.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2296-2
      Issue No: Vol. 24, No. 5 (2018)
  • Incorporation of graphene-Mn 3 O 4 core into polyaniline shell:
           supercapacitor electrode material
    • Authors: Rajender Boddula; Ravi Bolagam; Palaniappan Srinivasan
      Pages: 1467 - 1474
      Abstract: Hybrid supercapacitor is an important next-generation energy storage system. In order to enhance the specific capacitance of graphene-manganese oxide composite (GR-Mn3O4), polyaniline was introduced to GR-Mn3O4 (PANI-GR-Mn3O4) by sonochemical polymerization method. Formation of composites was confirmed from IR, XRD, and FE-SEM analyses. PANI-GR-Mn3O4 was used as binder-free electrode material in the supercapacitor symmetric cell and its electrochemical performances in terms of specific capacitance, energy, and power densities were compared with that of its constituents PANI-GO-Mn3O4, PANI-Mn3O4, and GR-Mn3O4. GR-Mn3O4 composite specific capacitance was boosted from 44 to 660 F g−1 with the encapsulation of polyaniline. The specific capacitance retention of PANI-GR-Mn3O4 was 89% with that of its original amount of 460 F g−1 with energy density is 23 W h kg−1 and power density 600 W kg−1 at 1 A g−1 for 4000 charge-discharge cycles. Graphical abstract Synthesis of PANI-GR-Mn3O4 composite and its electrochemical performance.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2300-x
      Issue No: Vol. 24, No. 5 (2018)
  • Simultaneous voltammetric determination of droxidopa, acetaminophen, and
           tyrosine on hematoxylin and graphene oxide/ZnO nanocomposite-modified
           glassy carbon electrode
    • Authors: Hadi Beitollahi; Hadiseh Salimi; Mohammad Reza Ganjali
      Pages: 1487 - 1495
      Abstract: Hematoxylin was used in combination with graphene oxide/ZnO nanocomposites as the adhesives for fabricating sensitivity-enhanced electrochemical droxidopa sensor. The electrochemical method showed an excellent character for electrocatalytic oxidization of droxidopa in the presence of acetaminophen and tyrosine. In addition, the experimental parameters such as pH values and the scan rate were optimized. Due to the fine characteristics of modified electrode, a good linear relationship between the anodic peak current and droxidopa concentration in the range 0.075–800.0 μM was observed. The detection limit (3σ) obtained by square wave voltammetry was 4.5 × 10−8 M (S/N = 3). This modified electrode showed excellent selectivity for the determination of droxidopa in the presence of acetaminophen and tyrosine. The prepared sensor was used for determination of droxidopa, acetaminophen, and tyrosine in the real samples.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2316-2
      Issue No: Vol. 24, No. 5 (2018)
  • Amino-functionalized graphene/chitosan composite as an enhanced sensing
           platform for highly selective detection of Cu 2+
    • Authors: Zunli Mo; Huandong Liu; Rere Hu; Hao Gou; Zhenliang Li; Ruibin Guo
      Pages: 1505 - 1513
      Abstract: The present work reports a facile and direct electrochemical method for sensing of trace Cu2+ by employing amino-functionalized graphene (NH2–G) and chitosan (Cs) as enhanced sensing platform. Amino-functionalized graphene was prepared by using a simple and effective solvothermal method and characterized by Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The novel amino-functionalized graphene/chitosan (NH2–G/Cs) composite was facilely prepared by sonochemical method. After being characterized with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), some relevant parameters influencing the sensor response were investigated and optimized. Analytical performance of the NH2–G/Cs modified glassy carbon electrode for the determination of Cu2+ was evaluated by differential pulse voltammetry (DPV). Under optimized operating conditions, the sensor linearly responded to Cu2+ concentration in the range from 0.4 to 40 μmol/L with a detection limit of 0.064 μmol/L (S/N = 3). Most importantly, the NH2–G/Cs/GCE achieved high selectivity and sensitivity for the analysis of trace Cu2+ in water samples.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2309-1
      Issue No: Vol. 24, No. 5 (2018)
  • Effect of annealing on microstructural, compositional, optical, and
           photoelectrochemical properties of CdSe thin films
    • Authors: Sethuramachandran Thanikaikarasan
      Pages: 1529 - 1536
      Abstract: Thin films of CdSe have been prepared on indium-doped tin oxide-coated conducting glass substrates from an aqueous electrolytic bath containing CdSO4 and SeO2. The process of annealing has been carried out to improve microstructural, optical, and photoelectrochemical properties of the prepared films. X-ray diffraction analysis revealed that as-deposited and annealed films exhibit hexagonal structure with preferential orientation along (002) plane. Nelson-Riley plot analysis has been carried out to determine exact value of lattice constants for as-deposited and annealed films. Optical absorption analysis has been captured to determine the value of optical parameters such as band gap, refractive index, and extinction coefficient of the deposited films. Photoelectrochemical solar cell analysis has been carried out and power output characteristics of the prepared films are investigated.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2292-6
      Issue No: Vol. 24, No. 5 (2018)
  • Enhanced optical and photoelectrochemical performance of
           single-crystalline TiO 2 nanorod arrays with exposed {001} facets
           sensitized with CdS nanosheets
    • Authors: Gang Wang; Changyong Zheng; Wei Zhou
      Pages: 1537 - 1544
      Abstract: Single-crystalline TiO2 nanorod arrays (TiO2 NRAs) with dominant {001} facets sensitized with CdS nanosheets were prepared on fluorine-doped tin oxide (FTO) substrate by a simple combination of hydrothermal and successive ion layer absorption and reaction (SILAR) methods. The amount of CdS nanosheets was controlled by changing reaction time (0, 2, 6, and 10 min) in SILAR process. The effects of SILAR time on the microstructure, morphology, and optical and photoelectrochemical properties of TiO2 NRAs were investigated. Changing of SILRA times are accompanied by significant variations of optical properties including a decrease of the band gap from 2.98 to 2.41 eV and a red absorption peak shift from ultraviolet to visible region. Notably, the photoelectrochemical performance of TiO2 NRAs after 6 min SILAR deposition of CdS nonosheets improved significantly, displaying an optimal photocurrent density of 1.5 mA cm−2, which is about 15 times higher than that of pure TiO2 NRAs. This enhanced photoelectrochemical properties due to the synergistic effect of CdS nanosheets and rutile TiO2 NRAs with highly reactive {001} facets.
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2301-9
      Issue No: Vol. 24, No. 5 (2018)
  • A novel thin solid electrolyte film and its application in all-solid-state
           battery at room temperature
    • Authors: Xufeng Yan; Zhuobin Li; Hangjun Ying; Feng Nie; Lixin Xue; Zhaoyin Wen; Wei-Qiang Han
      Pages: 1545 - 1551
      Abstract: A thin Li7La3Zr2O12 (LLZO) film of several micrometers was prepared by a novel method, which underwent the changes from micro-sized particles, nanoparticle slurry, and the final thin film. The LLZO film exhibited a high stability with metallic Li. The all-solid-state battery was composed by Li metal anode, a mixture cathode (LiCoO2 and LLZO), and the solid electrolyte of a composite of LLZO and LITFSI film. At room temperature, the Li/composite of LLZO and LITFSI/LCO cell showed a discharge capacity of 119.3 mAh g−1 at a current density of 0.21 mA cm−2 after 45 cycles, which was approximately 100% of that of the second cycle. Electrochemical impedance spectroscopy showed the reduction of the radius in low-frequency semicircle, demonstrating an improvement of interfacial contact between LLZO and LCO during the cycling. Graphical abstract ᅟ
      PubDate: 2018-05-01
      DOI: 10.1007/s11581-017-2353-x
      Issue No: Vol. 24, No. 5 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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