期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202116233
关键词
Acidic Overall Water Splitting; Cobalt Diphosphide; Nanowires; Vanadium
资金
- National Key R&D Program of China [2018YFB1502401]
- National Natural Science Foundation of China [21631004, U20A20250, 22171074, 21805073, 91961111, 21901064]
- Natural Science Foundation of Heilongjiang Province [YQ2021B009]
This study successfully fabricated a novel V-CoP2 porous nanowire electrocatalyst which showed excellent acidic overall water splitting activity and stability.
A proton exchange membrane water electrolyzer (PEMWE) in acidic medium is a hopeful scenario for hydrogen production using renewable energy, but the grand challenge lies in substituting noble-metal catalysts. Herein, a robust electrocatalyst of V-CoP2 porous nanowires arranged on a carbon cloth is successfully fabricated by incorporating vanadium into the CoP2 lattice. Structural characterizations and theoretical analysis indicate that lattice expansion of CoP2 caused by V incorporation results in the upshift of the d-band center, which is conducive to hydrogen adsorption for boosting the hydrogen evolution reaction (HER). Besides, V promotes surface reconstruction to generate a thicker Co3O4 layer with an oxygen vacancy that enhances acid-corrosion resistance and optimizes the adsorption of water and oxygen-containing species, thus improving activity and stability toward the oxygen evolution reaction (OER). Accordingly, it presents a superior acidic overall water splitting activity (1.47 V@10 mA cm(-2)) to Pt-C/CC||RuO2/CC (1.59 V@10 mA cm(-2)), and remarkable stability. This work proposes a new route to design efficient non-noble metal electrocatalysts for PEMWE.
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