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A Hydrogen–Bromate Flow Battery for Air‐Deficient Environments
Author(s) -
Modestov Alexander D.,
Konev Dmitry V.,
Tripachev Oleg V.,
Antipov Anatoly E.,
Tolmachev Yury V.,
Vorotyntsev Mikhail A.
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700447
Subject(s) - bromate , flow battery , electrolyte , anode , battery (electricity) , cathode , chemistry , hydrogen , proton exchange membrane fuel cell , airflow , inorganic chemistry , bromide , chemical engineering , materials science , catalysis , electrode , thermodynamics , power (physics) , organic chemistry , physics , engineering
A concept of high energy density (ED) hydrogen–bromate flow battery was supported by experiments with flow cells with 0.1 to 50 cm 2 apparent areas. H 2 /NaBrO 3 flow cells with H 2 gas diffusion anode, proton exchange membrane (PEM), and carbonaceous flow‐by or flow‐through cathodes were employed. Estimates show that the theoretical ED of the H 2 /bromate flow battery (HBFB) exceeds the ED of H 2 /O 2 fuel cells (FC) in air‐deficient environments. At the cathode of the HBFB, aqueous, concentrated bromate (non‐toxic, and stable) is reduced to bromide by a six‐electron process. 100 % conversion of BrO 3 − to Br − can be achieved. Although acidification of the BrO 3 − electrolyte is a prerequisite, the acid concentration in the electrolyte feed can be optimized as a trade‐off between area specific power ( P ) of the HBFB and its complexity.
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