期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003023
关键词
Co9S8; d‐ band center; octahedron; oxygen evolution reaction
类别
资金
- Key Research and Development of Ministry of Science and Technology of China [2018YFE0202601]
- National Natural Science Foundation of China [11947070, 51902220, 52072255]
- Natural Science Foundation of Zhejiang Province [LY21E020001, LTY20E020001]
By redesigning the six-coordinated octahedrons in Co9S8 using an Fe-incorporated method, the overall d-band center is regulated to achieve optimized adsorption and superior OER activity. This work sheds light on the design of OER catalysts through polyhedron engineering using topochemical deintercalation, resulting in a 95 mV reduction in overpotential at 10 mA cm(-2).
Significant efforts have been dedicated to boosting the electrocatalytic activity of Co9S8 for the oxygen evolution reaction (OER); however, with limited improvement in its intrinsic activity, which relies on careful band engineering. Fe possesses one less 3d electron and lower electronegativity than Co, suggesting a higher d-band center when forming polyhedron with S anions. Here, to improve the intrinsic activity by elevating the d-band center, the six-coordinated octahedrons in Co9S8 are redesigned utilizing an Fe-incorporated topochemical deintercalation method. Through substituting partial Co octahedrons by Fe octahedrons with higher d-band, the overall d-band center is regulated to achieve optimized adsorption and thus superior OER activity. With a reduction of 95 mV on the overpotential (at 10 mA cm(-2)), this work sheds lights on the design of OER catalysts through polyhedron engineering using topochemical deintercalation.
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