Citation: Xin-Bao Han, Dong-Xue Wang, Eduardo Gracia-Espino, Yu-Hui Luo, Yuan-Zhi Tan, Dong-Fei Lu, Yang-Guang Li, Thomas Wågberg, En-Bo Wang, Lan-Sun Zheng. Fe-substituted cobalt-phosphate polyoxometalates as enhanced oxygen evolution catalysts in acidic media[J]. Chinese Journal of Catalysis, ;2020, 41(5): 853-857. doi: 10.1016/S1872-2067(20)63538-0 shu

Fe-substituted cobalt-phosphate polyoxometalates as enhanced oxygen evolution catalysts in acidic media

a State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
b Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, China;
c Department of Physics, Umeå University, Umeå 90187, Sweden;
d Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222000, Jiangsu, China

Received Date: 30 July 2019
Revised Date: 28 August 2019

Fund Project: det (2017-04862) and Energimyndigheten (45419-1).This work was supported by the National Natural Science Foundation of China (21771155, 21721001) and the Ministry of Science and Technology of China (2014CB845603, 2017YFA0204902). T. W. acknowledges support from Vetenskapsrå

All-inorganic and earth-abundant bi-/trimetallic hydr(oxy)oxides are widely used as oxygen evolution electrocatalysts owing to their remarkable performance. However, their atomically precise structures remain undefined, complicating their optimization and limiting the understanding of their enhanced performance. Here, the underlying structure-property correlation is explored by using a well-defined cobalt-phosphate polyoxometalate cluster[{Co₄(OH)₃(PO₄)}₄(SiW₉O₃₄)₄]^32- (1), which may serve as a molecular model of multimetal hydr(oxy)oxides. The catalytic activity is enhanced upon replacing Co by Fe in 1, resulting in a reduced overpotential (385 mV) for oxygen evolution (by 66 mV) compared to that of the parent 1 at 10 mA cm^-2 in an acidic medium; this overpotential is comparable to that for the IrO₂ catalyst. These abundant-metal-based polyoxometalates exhibit high stability, with no evidence of degradation even after 24 h of operation.
- Colbalt-phosphate,
- Polyoxometalate,
- Oxygen evolution reaction,
- Isostructural substitution
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