期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 10, 页码 7272-7278出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01227
关键词
heterogeneous electrocatalysis; two-electron oxygen reduction reaction; 2e-ORR; hydrogen peroxide; H2O2; 2-2 '-dipyridylamine; organic molecular electrocatalyst; organic catalyst
资金
- Los Alamos National Laboratory, Laboratory Directed Research and Development program [LDRD 20190420ER]
Continuous production of hydrogen peroxide (H2O2) through the two-electron oxygen reduction reaction (2e-ORR) in distributed electrochemical cells offers important advantages for point-of-use water treatment and pulp bleaching over the complex industrial anthraquinone process. A low-cost, heterogeneous 2e-ORR electrocatalyst with high activity and selectivity is key to meeting the future needs for distributed production of H2O2 with large capacity. Herein, we demonstrate high activity and selectivity of a heterogeneous organic molecular electrocatalyst, 2,2'-dipyridylamine, with an H2O2 yield of similar to 80%, and an onset potential of similar to 0.60 V versus RHE in acidic aqueous electrolyte. We show that this acid-compatible, inexpensive, small organic molecule can catalyze 2e-ORR as efficiently as the state-of-the-art catalysts based on mercury-precious metal alloys. We propose different mechanisms of dioxygen electroreduction based on density functional theory calculations, which correlate activity with calculated standard reduction potential of reaction intermediates.
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