期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 19, 页码 10583-10587出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202101880
关键词
density functional theory; honeycomb carbon nanofibers; hydrogen peroxide electrosynthesis; O-2 entrapment; superhydrophilicity
资金
- National Natural Science Foundation of China [22072015]
This study introduces a superhydrophilic O-2-entrapping electrocatalyst for efficient two-electron oxygen reduction, achieving high H2O2 selectivity and ultrahigh mass activity. The catalytic mechanism is further elucidated through in situ Raman analysis and density functional theory calculations.
Electrocatalytic two-electron oxygen reduction has emerged as a promising alternative to the energy- and waste-intensive anthraquinone process for distributed H2O2 production. This process, however, suffers from strong competition from the four-electron pathway leading to low H2O2 selectivity. Herein, we report using a superhydrophilic O-2-entrapping electrocatalyst to enable superb two-electron oxygen reduction electrocatalysis. The honeycomb carbon nanofibers (HCNFs) are robust and capable of achieving a high H2O2 selectivity of 97.3 %, much higher than that of its solid carbon nanofiber counterpart. Impressively, this catalyst achieves an ultrahigh mass activity of up to 220 A g(-1), surpassing all other catalysts for two-electron oxygen reduction reaction. The superhydrophilic porous carbon skeleton with rich oxygenated functional groups facilitates efficient electron transfer and better wetting of the catalyst by the electrolyte, and the interconnected cavities allow for more effective entrapping of the gas bubbles. The catalytic mechanism is further revealed by in situ Raman analysis and density functional theory calculations.
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