Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 33, Pages 13778-13784Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202002394
Keywords
defects; electrocatalysis; methanol oxidation reaction; nanowires; oxygen reduction reaction
Categories
Funding
- National Natural Science Foundation of China [NSFC 21666023, NSFC 21467019, NSFC 51872115]
- Natural Science Foundation of Inner Mongolia Autonomous Region of China [2017JQ01, 2019BS02015]
- Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region [NJYT-19-A01]
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Vacancy defects of catalysts have been extensively studied and proven to be beneficial to various electrocatalytic reactions. Herein, an ultra-stable three-dimensional PtCu nanowire network (NNW) with ultrafine size, self-supporting rigid structure, and Cu vacancy defects has been developed. The vacancy defect-rich PtCu NNW exhibits an outstanding performance for the oxygen reduction reaction (ORR), with a mass activity 14.1 times higher than for the commercial Pt/C catalyst (20 %.wt, JM), which is currently the best performance. The mass activity of the PtCu NNW for methanol oxidation reaction (MOR) is 17.8 times higher than for the commercial Pt/C catalyst. Density-functional theory (DFT) calculations indicate that the introduction of Cu vacancies enhances the adsorption capacity of Pt atoms to the HO* intermediate and simultaneously weakens the adsorption for the O* intermediate. This work presents a facile strategy to assemble efficient electrocatalysts with abundant vacancy defects, at the same time, provides an insight into the ORR mechanism in acidic solution.
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