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  Subjects -> ENGINEERING (Total: 2270 journals)
    - CHEMICAL ENGINEERING (191 journals)
    - CIVIL ENGINEERING (183 journals)
    - ELECTRICAL ENGINEERING (99 journals)
    - ENGINEERING (1199 journals)
    - ENGINEERING MECHANICS AND MATERIALS (390 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (64 journals)
    - MECHANICAL ENGINEERING (89 journals)

ENGINEERING (1199 journals)            First | 1 2 3 4 5 6 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
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: 287)
Propulsion and Power Research     Open Access   (Followers: 25)
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  
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: 38)
Remote Sensing Letters     Hybrid Journal   (Followers: 36)
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)
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: 15)
Separation and Purification Technology     Hybrid Journal   (Followers: 9)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Shock and Vibration     Hybrid Journal   (Followers: 9)
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: 57)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 14)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 10)
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: 3)
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  
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: 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: 1)
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: 29)
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: 3)
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: 41)
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: 1)
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: 3)
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   (Followers: 1)
ZDM     Hybrid Journal  
Zede Journal     Open Access  
Zeitschrift fur Energiewirtschaft     Hybrid Journal  

  First | 1 2 3 4 5 6 | 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  [2329 journals]
  • 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
      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: 2017-05-20
      DOI: 10.1007/s11581-017-2144-4
       
  • A free-standing and thermostable polymer/plastic crystal electrolyte for
           all-solid-state lithium batteries
    • Authors: Yuan Dong; Tianjie Ding; Li-Zhen Fan
      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: 2017-05-20
      DOI: 10.1007/s11581-017-2152-4
       
  • Studies on the electrochemical and dopamine sensing properties of
           AgNP-modified carboxylated cellulose nanocrystal-doped
           poly(3,4-ethylenedioxythiophene)
    • Authors: Guiyun Xu; Shaoping Liang; Mingming Zhang; Jinshi Fan; Jiuju Feng; Xijuan Yu
      Abstract: Carboxylated cellulose nanocrystals (CNCC) were synthesized by treating microcrystalline cellulose with ammonium persulfate. Silver nanoparticles (AgNPs) were prepared on the surface of CNCC using NaBH4 as reductant. Novel conducting nanocomposites of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with AgNPs/CNCC were electrodeposited on the surface of the glassy carbon electrode. The nanocomposites prepared in various ratios of PEDOT, CNCC, and AgNPs were characterized by scanning electron microscopy, transmission electron microscope, electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. The prepared PEDOT/AgNPs/CNCC showed much low electrochemical impedance and very good response towards the oxidation of dopamine. Based on these findings, a highly stable, sensitive, and selective amperometric sensor for the detection of dopamine was developed. Operated at 0.20 V (vs. Ag/AgCl), the sensor can detect dopamine in the range of 0.05 to 782 μM with a 17-nM detection limit.
      PubDate: 2017-05-19
      DOI: 10.1007/s11581-017-2112-z
       
  • Fractal model of polymer electrolyte to investigate influence of high
           energy irradiation in molecular distribution and molar mass average
    • Authors: Subhasish Ghosal; Ruma Ray; Madhumita Mukhopadhyay; Sujata Tarafdar
      Abstract: The present work is completely based on the theoretical investigation i.e. computer simulated study of the effect of gamma irradiation on the molecular weight distribution and the molar mass averages of solid polymer electrolytes which is relevant with the present trends of experimental works in this field. We propose a fractal model corresponding to polymer molecules by deterministic loop-less fractal (Vicsek). An initial un irradiated symmetrical molecular weight distribution has been considered. Application of high energy perturbation, for example gamma irradiation, affects the molecules mainly by two processes-scission and cross-linking of molecules which results morphological changes inside the system. A new parameter named as weight fraction, has been introduced to compare the structural modification of the sample with the experimental results. The four basic parameters representing the molar mass averages have been introduced in this context to analyze various structural properties such as intrinsic viscosity, number, weight and Z-average molecular weight etc. The results of our simulation work enables us an easy understanding about the nature of the response of solid polymer electrolyte to the external perturbation.
      PubDate: 2017-05-19
      DOI: 10.1007/s11581-017-2133-7
       
  • 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
      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: 2017-05-18
      DOI: 10.1007/s11581-017-2132-8
       
  • 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
      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: 2017-05-17
      DOI: 10.1007/s11581-017-2137-3
       
  • Facile fabrication of coal-derived activated carbon/Co 3 O 4
           nanocomposites with superior electrochemical performance
    • Authors: Junsheng Zhu; Shuangquan Zhang; Dianlong Wang
      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: 2017-05-17
      DOI: 10.1007/s11581-017-2145-3
       
  • An electron transfer in CuCl-CuCl 2 melt at different Cl 2 partial
           pressures
    • Authors: P. Yu. Shevelin; A. A. Raskovalov; N. G. Molchanova
      Abstract: Electron and ion transference numbers, conductivity, and Cu+/Cu2+ concentration ratio in the CuCl-CuCl2 melt are measured at temperature of 560 °C and partial pressure of chlorine from 0.1 to 1 atm. The electron transference numbers and the total conductivity grow with chlorine partial pressure; that is accompanied by decreasing of ionic conductivity both in contribution and absolute values. The total conductivity changes from ∼6 to ∼8 S cm−1 while pCl2 increases from 0.1 to 1 atm. The electron transference numbers increase from 67 to 95% in the same chlorine partial pressure range. The electronic conductivity is evaluated by two independent methods. Values of electronic conductivity obtained from the concentrations of Cu2+ ions are close to that obtained by Faraday efficiency measurements.
      PubDate: 2017-05-16
      DOI: 10.1007/s11581-017-2120-z
       
  • Amperometric nitrite sensor based on free-standing carbon
           nanotube/methylene blue composite paper
    • Authors: Tuğba Ömür; Murat Alanyalıoğlu
      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: 2017-05-15
      DOI: 10.1007/s11581-017-2142-6
       
  • Simple preparation of birnessite-type MnO 2 nanoflakes with multi-walled
           carbon nanotubes for the sensitive detection of hydrogen peroxide
    • Authors: Karuppasamy Kohila Rani; Rajkumar Devasenathipathy; Sea-Fue Wang; Chieh Yang
      Abstract: Manganese oxide nanoflakes incorporated functionalized multi-walled carbon nanotubes (f-MWCNTs/MnO2 NFs) have been prepared through a simple chemical method. The morphology and structure of the prepared composites were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction spectroscopy (XRD), and X-ray photoelectron spectroscopy (XPS). Our present study demonstrated that enzymeless hydrogen peroxide sensor holds good in a wide linear range from 5 to 4530 μM with the calculated limits of detection and sensitivity values to be 0.952 μM and 219.05 μA mM−1, respectively. During hydrogen peroxide detection, f-MWCNT/MnO2 NF-modified glassy carbon electrode reached 95% of the steady-state response current within 4 s. In addition, our finding selectively detects hydrogen peroxide even in the presence of other interfering biomolecules. Ease of preparation, good electrocatalytic ability, and feasible practicality can potentially extend our fabricated electrode towards the applications of such biosensors and energy storage devices in the near future.
      PubDate: 2017-05-13
      DOI: 10.1007/s11581-017-2117-7
       
  • 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
      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: 2017-05-12
      DOI: 10.1007/s11581-017-2131-9
       
  • Effect of surface hydrophilicity on the supercapacitive performance of
           carbon paper
    • Authors: Qun Luo; Zhiyu Cheng; Yongfu Qiu; Ni Zhang; Hongbo Fan
      Abstract: In this paper, the surface hydrophilicity of carbon paper was modified by use of Caro’s acid, and MnO2 electrodeposited on carbon paper (CP) or surface-modified carbon paper (SMCP) were prepared through an anodic electrochemical deposition method. The attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectra of CP, SMCP-30, SMCP-60, and SMCP-90 indicated that the peaks at 1054, 1214, 1722, and 3426 cm−1 correspond to the stretching vibrations of C–O, C–H, C=O, and –OH. Our study results show that with the extension period of oxidation treatment time, the corresponding content of these groups C–O, C–H, C=O, and –OH increased; then, their surface hydrophilic properties enhanced; and finally, their capacitances increased. This study results indicate that introducing these groups C–O, C–H, C=O, and –OH into the surface of electrode materials is an important strategy for improving their capacitances.
      PubDate: 2017-05-12
      DOI: 10.1007/s11581-017-2140-8
       
  • 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
      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: 2017-05-10
      DOI: 10.1007/s11581-017-2128-4
       
  • 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
      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: 2017-05-10
      DOI: 10.1007/s11581-017-2134-6
       
  • 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
      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: 2017-05-09
      DOI: 10.1007/s11581-017-2139-1
       
  • Influence of pH in La-doped SnO 2 nanoparticles towards sensor
           applications
    • Authors: S. Jayapandi; P. Packiyaraj; S. Premkumar; J. Mayandi; K. Anitha
      Abstract: The present investigation has been carried out to optimize the pH level of lanthanum (La)-doped tin dioxide (SnO2) nanoparticles towards the potential application in gas sensor. The La-doped SnO2 nanoparticles were synthesized by sol-gel method in different pH values varying from acidic to base nature. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet (UV), photoluminescence (PL), and scanning electron microscopy (SEM) techniques. The XRD, UV, and PL analyses show the pH influences on the crystallite size of La-doped SnO2 nanoparticles. The SEM images show the formation of porous structure at pH 11. Also, the electrical conductivity of 1 mol% La-doped SnO2 at pH 3 and pH 11 were measured by impedance analyzer. In addition, we have fabricated and demonstrated device performance of synthesized La-doped SnO2 nanoparticles for gas-sensing application. Real-time current response and long-time response to the gas sensing were also studied for the fabricated device.
      PubDate: 2017-05-09
      DOI: 10.1007/s11581-017-2121-y
       
  • Chromate-selective electrodes prepared by using calix[4]arenes for the
           speciation of Cr(VI) and Cr(III)
    • Authors: Berna Dalkıran; H. Elif Kormalı Ertürün; Ayça Demirel Özel; Esin Canel; Sevil Özkınalı; Esma Kılıç
      Abstract: The calix[4]arene and its mono-, di-, tri-, and tetra-acryloyl esters were used as suitable ionophores for Cr(VI) species to develop poly(vinyl chloride) (PVC) membrane electrodes. The influence of membrane contents and pH on the potentiometric response of the electrodes was described. Five novel chromate-selective PVC membrane electrodes displayed close to Nernstian behavior with slopes of 53–62 mV/decade of hydrogen chromate ion concentration in the dynamic range of 1.0 × 10−6 and 1.0 × 10−2 M at pH 1.0. Other response characteristics of these electrodes such as response time (~10 s), lifetime (>12 months), and detection limit (6.2 × 10−7 M) were identified, and the selectivity coefficients towards various anions were determined by using fixed interference method. Moreover, the proposed electrodes were successfully used for speciation of Cr(VI) and Cr(III) and for the potentiometric titration of Cr(VI) species with standard Fe(II) solution as an indicator electrode.
      PubDate: 2017-05-08
      DOI: 10.1007/s11581-017-2080-3
       
  • Preparation, properties, and Li-ion battery application of
           EC + PC-modified PVdF-HFP gel polymer electrolyte films
    • Authors: Shenhua Song; Jingwei Wang; Jiwu Tang; Ravi Muchakayala; Rui Ma
      Abstract: Based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) and lithium tetrafluoroborate (LiBF4) salt along with blending plasticizers, ethylene carbonate (EC) and propylene carbonate (PC), high Li-ion-conducting gel polymer electrolyte films are developed. Their properties are characterized by various techniques. The ambient temperature ionic conductivity of the 85PVdF-HFP:15LiBF4 + 150(EC + PC) electrolyte film has a high value of 8.1 × 10−4 S cm−1. Its crystallinity, melting point, and electrochemical stability window are 9.5%, 115 °C, and 4.6 V, respectively. The mechanical testing shows that the Young’s modulus, yield strength, and breaking strain of this electrolyte film are 36.8 MPa, 3.4 MPa, and 320%, respectively. Lithium-ion batteries based on the gel polymer electrolyte film exhibit remarkable charge–discharge and cycling performances. The initial discharge capacity of this battery is as high as 165.1 mAh g−1 at 0.1 C and just shows a small capacity fading of 4.8% after 120 cycles, indicating that the 85PVdF-HFP:15LiBF4 + 150(EC + PC) system is an excellent electrolyte candidate for lithium-ion battery applications. The charge–discharge performance of the Li-ion cell fabricated with this gel polymer electrolyte film is apparently better than that of the previously reported Li-ion cells fabricated with other PVdF-HFP-based gel polymer electrolyte films.
      PubDate: 2017-05-07
      DOI: 10.1007/s11581-017-2130-x
       
  • P2-type Na 0.67 Ni 0.33−x Cu x Mn 0.67 O 2 as new high-voltage cathode
           materials for sodium-ion batteries
    • Authors: Sen Chen; Enshan Han; Han Xu; Lingzhi Zhu; Bin Liu; Guangquan Zhang; Min Lu
      Abstract: P2-Na0.67Ni0.33−x Cu x Mn0.67O2 (x = 0, 0.02, 0.04, 0.06, 0.08) cathode materials have been synthesized via acetate decomposition method. The elementary composition and crystal structure of the powders are studied in detail using inductively coupled plasma-atomic emission spectrometry (ICP-AES) and X-ray diffraction (XRD). XRD results demonstrate that Cu2+ ions have been incorporated into the crystal structure successfully and the P2-type structure remains unchanged after substitution. According to XPS data, Cu substitution does not change the valence states of Ni and Mn, whose predominant oxidation states in Na-Ni-Mn-O structure remains +2 and +4. The introduction of Cu2+ can effectively suppress P2-O2 phase transformation when charging to 4.5 V, and significantly improve rate performance and cyclic stability compared to the undoped material. The P2-Na0.67Ni0.27Cu0.06Mn0.67O2 sample can deliver an initial discharge capacity of 211.6 mAh g−1 at 10 mAh g−1 between 1.5 and 4.5 V, and a capacity retention of 93.9% after 10 cycles. Moreover, it can also deliver a discharge capacity of 115.2 mAh g−1 at 100 mAh g−1. In addition, electrochemical impedance spectroscopy (EIS) reveals that P2-Na0.67Ni0.27Cu0.06Mn0.67O2 cathode exhibits a higher electronic conductivity and faster sodium ion diffusion velocity than that of undoped sample. These results show that P2-Na0.67Ni0.27Cu0.06Mn0.67O2 is a promising high-voltage cathode material for sodium-ion batteries.
      PubDate: 2017-05-06
      DOI: 10.1007/s11581-017-2122-x
       
  • Electrodeposition study of simulated and dissolution solutions of the
           positive electrode of a spent Ni-MH battery using the electrochemical
           quartz crystal microbalance and inductively coupled plasma optical
           emission spectrometry
    • Authors: P.V.M. Dixini; V.C.B. Pegoretti; V.G. Celante; F.S. Betim; M.B.J.G. Freitas
      Abstract: The use of electrochemical quartz crystal microbalance (EQCM) and inductively coupled plasma optical emission spectrometry (ICP-OES) as well as potentiodynamic and potentiostatic methods has revealed the electrodeposition mechanism from simulated solutions containing Ni2+, Co2+, Zn2+, and Mn2+, and a leached solution from cathodes of spent Ni-MH batteries. For simulated solutions, electrodeposition occurs via direct reduction, involving two electrons. Zn2+ addition in the solution containing Ni2+ and Co2+ leads to a change in the electrodeposition potential for more negative values. Mn2+ addition in the bath containing Ni2+, Co2+, and Zn2+ does not change the electrodeposition process. The electrodeposition from the leached solution occurs in parallel with the hydrogen and oxygen reduction, with the passage of 4 mol of electrons. The MM/z ratios calculated using ICP-OES are very similar to those obtained by EQCM measurements, revealing the appropriateness of the mechanisms proposed in this work.
      PubDate: 2017-05-05
      DOI: 10.1007/s11581-017-2127-5
       
 
 
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