期刊
CURRENT OPINION IN ELECTROCHEMISTRY
卷 32, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.coelec.2021.100883
关键词
Borohydride oxidation reaction; Direct borohydride fuel cells; Platinum; Nickel; Palladium
资金
- National Research Agency [ANR-1-CE05-0017]
- Centre of Excellence of Multifunctional Architectured Materials CEMAM [ANR-10-LABX-44-01]
- Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov lnstitute of Catalysis [AAAA-A21-121011390006-0]
Direct borohydride fuel cells face challenges in achieving high efficiency, including the selection of suitable catalysts, optimization of reaction conditions, and the choice of appropriate membrane materials.
Direct borohydride fuel cells (DBFC) oxidize an easily-stored energy-dense borohydride fuel (sodium borohydride: NaBH4), that in theory reacts ca. 400 mV below H2 and produces 8 electrons per BH4- anion. However, the borohydride oxidation reaction (BOR) does not fully meet these promises in practice: the electrocatalyst nature, structure and state-of-surface, and the operating conditions (pH, BH4- concentration, temperature, fluxes) noticeably influence the BOR kinetics and mechanism. Nickel and platinum-based catalysts both have assets for the BOR. DBFCs can only yield decent performance if their separator combines high ion-conductivity and efficient separation of the reactants; cation-exchange membranes, anionexchange membranes, bipolar membranes and porous separators all have their own advantages and drawbacks. Besides the anode, the choice of separator must consider the DBFC cathode reaction, where oxygen (usually from air) or hydrogen peroxide are reduced, provided adapted catalysts are used. All these aspects drive the DBFC performance and stability/ durability.
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