Developing efficient electrocatalyst at large current densities to meet the requirement of industrial water splitting is a big challenge today. Herein, we report a new class of catalyst, BiCoO3 with pyramidally coordinated Co3+. BiCoO3 exhibits a large current density of 1000 mA cm−2 at a low overpotential of 402 mV and the overpotential even reduces to only 303 mV to achieve 1000 mA cm−2 by replacing Co with Fe, which ranks the highest performance among Co-based electrocatalysts reported far. Different from artificially created oxygen vacancies to optimize the bonding strength of the intermediate for enhancement of OER activity, BiCoO3 has the rich active sites and the shortest reaction pathway leading to an extraordinary large current density, as structurally every Co-O cluster has one oxygen vacancy. This work opens a new avenue for enhanced OER activity at high current densities via optimizing the arrangement of ligand vacancies.
Keywords: BiCoO3, oxygen evolution reaction, Large current density, oxygen vacancies
Hu, Yitian and Li, Lili and Zhao, Jianfa and Huang, Yu-Cheng and Kuo, Chang-yang and Zhou, Jing and Fan, Yalei and Lin, Hong-Ji and Dong, Chung-Li and Pao, Chi Wen and Lee, Jyh-Fu and Chen, Chien-Te and Jin, Changqing and Hu, Zhiwei and Wang, Jian-Qiang and Zhang, Linjuan, Extraordinary Large Current Density for Oxygen Evolution from Pyramidally-Coordinated Co Oxide. Available at SSRN: https://ssrn.com/abstract=4349473 or http://dx.doi.org/10.2139/ssrn.4349473
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