期刊
NANO LETTERS
卷 20, 期 10, 页码 7751-7759出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03340
关键词
electrochemical reconstruction; inverse interface; methanol oxidation; PtBi; X-ray absorption spectroscopy
类别
资金
- National Natural Science Foundation of China [21673150, 51922073, 2190030094]
- Natural Science Foundation of Jiangsu Province [BK20180097, SBK20190810]
- Jiangsu Province High-Level Talents [JNHB-106]
- China Postdoctoral Science Foundation [2019M660128]
- 111 Project, Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- U.S. DOE [DEAC02-06CH11357]
- Canadian Light Source
Developing efficient Pt-based electrocatalysts for the methanol oxidation reaction (MOR) is of pivotal importance for large-scale application of direct methanol fuel cells (DMFCs), but Pt suffers from severe deactivation brought by the carbona-ceous intermediates such as CO. Her; we demonstrate the formation of a bismuth oxyhydroxide (BiOx(OH)(y))-Pt inverse interface via electrochemical reconstruction for enhanced meth-anol oxidation. By combining density functional theory calcu-lations, X-ray absorption spectroscopy, ambient pressure X-ray photoelectron spectroscopy, and electrochemical characterizations, we reveal that the BiOx(OH)(y)-Pt inverse interface can induce the electron deficiency of neighboring Pt; this would result in weakened CO adsorption and strengthened OH adsorption, thereby facilitating the removal of the poisonous intermediates and ensuring the high activity and good stability of Pt2Bi sample. This work provides a comprehensive understanding of the inverse interface structure and deep insight into the active sites for MOR, offering great opportunities for rational fabrication of efficient electrocatalysts for DMFCs.
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