Electrochemical Systems of Energy Accumulation

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This review is devoted to analysis of the possibility to use electrochemical energy systems at low temperatures. It is not possible to attain this goal without ecologically pure autonomous energy sources -chemical current sources capable of operating at temperatures up to -60 °C which are presently under development. Renewable energy systems combined with hydrogen fuel cells can also be used for this purpose, in particular with fuel cells and solid polymer electrolyte that can already operate normally at temperatures ranging from -20 to +50 °C and are perspective to be used and stored at lower temperatures.

Section: Electrochemical Systems Based On Solid Polymer Electrolytementioning

confidence: 99%

Electrochemical Technologies for Low Temperatures

Фатеев¹,

Кулова²,

Серегина³

et al. 2019

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“…In equations (1) - (2): φ e ,φ p -the electron potential in the electron-conducting subsystem and the proton potential in the proton-conducting subsystem of the CL; i e ,i p -the electron current density in the electron-conducting subsystem and the proton current density in the proton-conducting subsystem of the CL; σ e ,σ p -the specific conductivity ofthe electron-conducting subsystem and the protonconducting subsystem of the CL; φ = , φ = -Tafel slopes foranodic and cathodic reactions, respectively; α a ,α c -transfer numbersofanodic and cathodic reactions, respectively. C O0 , C Oc -oxygen concentration at the outer boundary and the inside one of the CL, respectively; Doc L -the efficient oxygen diffusion coefficient of the oxy gen in the CL porous media;C Oref -the value of the comparative oxygen concentration (C Oref =8.2mol/m 3 ).…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…Unitized regenerative fuel cell (URFC) is an electrochemical device which may operate as both fuel cell giving the power supply and electrolyzer generating hydrogen for energy storage. Power generation system based on polymer electrolyte membrane (PEM) URFC is characterized by high power and energy density and low cost in comparison with the system based on separate fuel cell and electrolyzer and could provide the longterm energy storage (in comparison with typical batteries) as well [1,2].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Reversible Fuel Cell Oxygen Electrode Composition and Structure

Kalinnikov¹,

Pushkareva²,

Porembskii³

et al. 2019

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The optimization of the structure and composition of the oxygen electrode catalytic layer in polymer electrolyte membrane (PEM) unitized regenerative fuel cell (URFC) is described. The theoretical model described the transfer processes in catalytic layer is modified which allows to consider the Pt and Ir content influence on the catalytic layer performance at different URFC operating modes. The model calculations are verified through the URFCcell testing.

“…An efficiency and a performance of polymer electrolyte membrane (PEM) electrochemical systems (fuel cells (FC) [1], oxygen concentrator [2], electrolysis cell for ozone production [3], reversible fuel cells [4][5] etc.) considerably depend on the structure and properties of the both the catalyst and the catalytic layer based on it.…”

Section: Introductionmentioning

confidence: 99%

COMPARATIVE STUDY OF Pt-BASED CATALYSTS SUPPORTED ON VARIOUS CARBON SUPPORTS FOR SOLID POLYMER ELECTROLYTE ELECTROCHEMICAL SYSTEMS

Baranov¹,

Porembskii²,

Lyutikova³

et al. 2019

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The comparative study of electrocatalysts synthesized by chemical reduction and pulsed magnetron-ion sputtering for polymer electrolyte membrane electrochemical systems are presented. Various carbon nanomaterials were used as supports of Pt nanoparticles: carbon black, nanotubes, nanofibers and reduced graphene oxide. The electrochemical studies of the obtained electrocatalysts as well as their testing in the fuel cell membrane-electrode assembly were carried out. The influence of supports morphology and the deposition approach of Pt nanoparticles on the electrochemically active surface area and activity of electrocatalysts, as well as the prospects of the magnetron-ion sputtering approach for electrocatalysts synthesis were studied and discussed.