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Modulating the Oxygen Evolution Reaction of Single-Crystal Cobalt Carbonate Hydroxide via Surface Fe Doping and Facet
Shenghua Ye1,2,3, Zhijun Ou2, Weibin Chen2
1State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
Abstract:
The oxygen evolution reaction (OER) is a critical half-reaction in water splitting and metal-air cells. The sensitivity of the OER to the composition and structure of the electrocatalyst presents a significant challenge in elucidating the structure-property relationship. In this study, highly stable single-crystal cobalt carbonate hydroxide [Co2(OH)2CO3, CoCH] was used as a model to investigate the correlations among structure, composition, and reactivity. Single-crystal CoCH nanowires (denoted as CoCH NWs) and Fe-doped CoCH nanowires (denoted as Fe-CoCH NWs) with an exposed (210) facet and Fe-doped CoCH nanosheets (denoted as Fe-CoCH NSs) with an exposed (2-13) facet were synthesized using electrochemical and one-step hydrothermal strategies, respectively. Their OER activity decreased in the following order: Fe-CoCH NWs > Fe-CoCH NSs > CoCH NWs. Theoretical investigation suggested that the doped Fe sites serve as active sites, and the crystal-facet dependence can finely adjust the 3d configuration of Fe sites, resulting in the optimal adsorption strengths and energy barriers for potential-determining steps on the (210) facet of CoCH. This renders the as-prepared Fe-CoCH NWs as some of the most promising Co-based OER catalysts.
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