期刊
MATERIALS CHEMISTRY FRONTIERS
卷 5, 期 1, 页码 259-267出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qm00671h
关键词
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资金
- National Natural Science Foundation of China [51672138]
- National First-Rate Discipline Construction Project of Ningxia [NXYLXK2017A04]
- Talent-introducing Special Foundation for Key Research Program of Ningxia [2018BEB04032]
- Natural Science Foundation of Ningxia [2020AAC03003]
- Ningxia Fostering Program for Innovative Leading Talents in Science and Technology [KJT2017003]
- Program for Youth Excellent Scholars of State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering
- Natural Science Foundation of Ningxia University [ZR1719]
In this study, multiple strategies were successfully integrated into one catalytic system to enhance the OER performance of hollow Co3O4 dodecahedrons. The excellent OER performance was attributed to the unique hollow structure, controlled exposure of the (111) facets, and high content of oxygen vacancies, providing more highly active sites and enhanced conductivity.
Rational design and preparation of advanced electrocatalysts for the oxygen evolution reaction (OER) are highly desirable, where various strategies have been applied to enhance the electrocatalytic activities, such as developing nanostructures, facet control, and creating oxygen vacancies. Herein, we have successfully integrated multiple strategies into one catalytic system for further enhancing the OER performance. A series of hollow Co3O4 dodecahedrons with controlled crystal orientation and oxygen vacancies were prepared by using ZIF-67 as a precursor and adjusting the atmosphere during calcination. Hollow Co3O4 dodecahedrons with both controlled exposure of the (111) facets and high content of oxygen vacancies showed an excellent OER performance with an overpotential of 307 mV at 10 mA cm(-2) and a Tafel slope as low as 55 mV dec(-1) and significantly superior to its counterpart with low content of oxygen vacancies or a broken Co3O4 dodecahedron being ground and losing the preferred facets of (111). The excellent OER performance should be attributed to the unique hollow structure and the effective control of the (111) facets and oxygen vacancies, which allows for more highly active sites and enhanced conductivity.
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