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RAS Chemistry & Material ScienceЭлектрохимия Russian Journal of Electrochemistry

  • ISSN (Print) 0424-8570
  • ISSN (Online) 3034-6185

Voltammetric and discharge characteristics of hydrogen-chlorate current generator with sulfuric acid electrolyte

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PII
S3034618525030039-1
DOI
10.7868/S3034618525030039
Publication type
Article
Status
Published
Authors
O. I. Istakova
  • Affiliation:
    Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences
    Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Science
M. A. Vorotyntsev
  • Affiliation: Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Volume/ Edition
Volume 61 / Issue number 3
Pages
187-198
Abstract
Operation of a single cell of redox-flow hydrogen-halogenate current generator which converts the energy of the oxidation reaction of gaseous hydrogen by sodium chlorate in aqueous sulfuric-acid solution into electric energy with the use of a membrane-electrode assembly of the composition: (–) H2, Pt–C // PEM // NaClO3, C (+) has been studied. A combined load operation regime (which includes stages of potentio- and galvanostatic control) has been applied, in order to take into account specific features of the chlorate electroreduction half-reaction, i. e. its redox-mediator autocatalytic mechanism (EC-autocat). For aqueous electrolytes containing various sulfuric acid contents, the system parameters determining the power and efficiency of the hydrogen-chlorate current generator have been established: faradaic and energy efficiencies, average discharge power and time to reach the steady-state mode. It has been found that the hydrogen-chlorate cell under study functions most efficiently for the 5 M sulfuric-acid electrolyte: such a cell has reached the constant-current mode to generate the 0.25 A/cm2 current density within one and a half minutes; it has been able to convert the chemical energy into the electric one with the 55% efficiency at the average specific discharge power of 0.23 W/cm2.
Keywords
водородно-хлоратный генератор тока редокс-медиаторный автокатализ плотность тока и мощность разряда фарадеевская (зарядовая) и энергетическая эффективности время выхода на стационарный режим
Date of publication
17.03.2025
Year of publication
2025
Number of purchasers
0
Views
75

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