Equilibrium and Discharge Characteristics of a Single Cell of Hydrogen–Vanadium Battery with Electrolyte of Different Acidity

Istakova, O.I.; Konev, D.V.; Tolstel, D.O.; Vorotyntsev, M.A.

Авторы: Istakova O.I., Konev D.V., Tolstel D.O., Vorotyntsev M.A.
Журнал: Russian Journal of Electrochemistry
Том: 61
Номер: 5
Год издания: 2025
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 208
Последняя страница: 218
Оригинальные версии: Равновесные и разрядные характеристики единичной ячейки водородно-ванадиевой батареи с электролитом различной кислотности , Равновесные и разрядные характеристики единичной ячейки водородно-ванадиевой батареи с электролитом различной кислотности
DOI: 10.1134/s102319352560018x
Аннотация: A single-unit of rechargeable power source, the hydrogen–vanadium battery(Pt‒C)H2|Nafion| (C), is studied for various sulfuric-acid contents in the vanadium electrolyte (catholyte) over the 3–6 M range of the total amount of sulfuric-acid residues and a total concentration of vanadiumcompounds of 1 M. For this composition range, the dependences of the cell voltage and the half-cell potentials on the vanadyl-to-vanadate ratio in the electrolyte is determined for the open-circuit regime while thevoltage and potentials shifts are measured for the current passing through the cell in both directions. The contributions to the cell voltage from both half-cell potentials as well as their polarizations are found separatelyby means of an external reference electrode branched to the vanadium flow electrode via a film-shaped Luggin capillary. The vanadium electrolyte conductivity is measured in the course of charge–discharge cyclingand its dependence on the vanadyl-to-vanadate ratio for the series of electrolyte compositions is determined.For the high-current region, the cell maximal specific discharge power is found to decrease from 0.68 to0.45 W/cm2 with increase of the catholyte acidity, as a consequence of the concentration polarizations of boththe positive and the negative half-cells, with a much higher relative contribution from the latter one. For thelow-current region (±0.25 A/cm2), the current–voltage curves of both half-cells are linear. With growingelectrolyte acidity, the slope (i.e., the polarization resistance) increased in the hydrogen half-cell; decreased,in the vanadium one. As a result, their sum (i.e., the total cell resistance) increased from 0.34 to 0.39 Ω cm2over the studied acidity range.
Добавил в систему: Толстель Дмитрий Олегович

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Equilibrium and Discharge Characteristics of a Single Cell of Hydrogen–Vanadium Battery with Electrolyte of Different Acidityстатья

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