期刊
ADVANCED MATERIALS
卷 31, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901977
关键词
in situ exsolution; in situ X-ray absorption spectroscopy; oxygen evolution reaction; oxy-hydroxide intermediate; pyrochlore oxide
类别
资金
- Korea Institute of Energy Technology Evaluation and Planning [20184030202070] Funding Source: Medline
- Ministry of Trade, Industry and Energy of the Korean government Funding Source: Medline
- Ministry of Trade, Industry and Energy Funding Source: Medline
- Korea Evaluation Institute of Industrial Technology (KEIT) [20184030202070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
It is crucial for leaping forward renewable energy technology to develop highly active oxygen evolution reaction (OER) catalysts with fast OER kinetics, and the novel design of high-performance catalysts may come down to unveiling the origin of high catalytic behavior. Herein, a new class of heterogeneous OER electrocatalyst (metallic Co nanoparticles anchored on yttrium ruthenate pyrochlore oxide) is provided for securing fast OER kinetics. In situ X-ray absorption spectroscopy (in situ XAS) reveals that fast OER kinetics can be achieved by the harmonious catalytic synergy of a pyrochlore oxide support to Co nanoparticles. By the facile oxidation of yttrium (A-site) and ruthenium (B-site) cations, the pyrochlore oxide support helps to expel the electrons generated from the catalytic behavior of Co to the inner layers of the support, facilitating the electrostatic adsorption of OH- ions and reducing the barrier energy for the formation of CoOOH intermediates. This work affords the rational design of transition metal nanoparticles anchored on pyrochlore oxide heterogeneous catalysts and the fundamental insight of catalytic origin associated with self-reconstruction of OER electrocatalysts.
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