期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 38, 页码 16711-16718出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.03.174
关键词
Amorphous oxyhydroxide; Cobalt-iron oxyhydroxide; Cobalt-iron oxide; Oxygen evolution reaction; Energy barrier
资金
- National Natural Science Foundation of China [22075099]
- Education Depart-ment of Jilin Province [JJKH20220967KJ]
Cobalt-iron oxyhydroxide demonstrates excellent OER activity with appropriate crystallization, the active sites being di-mu-oxo bridged Fe-Co. Partial crystallization accelerates the OER process.
Developing high-performance noble-metal-free electrocatalysts for the oxygen evolution reaction (OER) is of great significance for the large-scale implement of electrochemical water splitting. Here, we demonstrate that cobalt-iron oxyhydroxide (CoFe0.8(OH)(x)) with appropriate crystallization exhibits excellent OER activity with a low overpotential of only 246 mV, which is much lower than that achieved on amorphous one. Kinetic experiments indicate that the OER active sites should be di-mu-oxo bridged Fe-Co, on which lower energy barrier is attained than that on Fe-O and Co-O sites. Partial crystallization is beneficial to the lattice contraction, the formation of Co-O-Fe sites, and the decrease of charge transfer resistance, thus accelerating OER process. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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