Activating the lattice oxygen in (Bi0.5Co0.5)2O3 by vacancy modulation for efficient electrochemical water oxidation

Huan Liu; Xiaoning Li; Cailing Peng; Liuyang Zhu; Yuanxi Zhang; Huiru Cheng; Jiameng Cui; Qingmei Wu; Yingying Zhang; Zezhi Chen; Wei Zou; Wen Gu; Haoliang Huang; Jianlin Wang; Bangjiao Ye; Zhengping Fu; Yalin Lu

doi:10.1039/D0TA03411H

Activating the lattice oxygen in (Bi_0.5Co_0.5)₂O₃ by vacancy modulation for efficient electrochemical water oxidation†

Huan Liu,^a Xiaoning Li,

^b Cailing Peng,^a Liuyang Zhu,^a Yuanxi Zhang,^a Huiru Cheng,^c Jiameng Cui,^a Qingmei Wu,^a Yingying Zhang,^a Zezhi Chen,^a Wei Zou,^a Wen Gu,^a Haoliang Huang,

^bd Jianlin Wang,

^bd Bangjiao Ye,^c Zhengping Fu

*^abd and Yalin Lu*^abd

Author affiliations

* Corresponding authors

^a Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Degradation, University of Science and Technology of China, Hefei 230026, P. R. China
E-mail: fuzp@ustc.edu.cn, yllu@ustc.edu.cn

^b Synergetic Innovation Center of Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, P. R. China

^c State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, P. R. China

^d Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, P. R. China

Abstract

The catalytic activity for the oxygen evolution reaction (OER) in electrocatalytic water splitting strongly depends on the adsorption energy of intermediates. For the generally proposed adsorbate evolution route, the universal scaling relation between the adsorption energies of *OOH and *OH leads to an OER efficiency limitation based on the “volcano curve”. A possible solution to bypass the scaling relation is to avoid the formation of the *OOH intermediate in the OER with the participation of lattice oxygen from catalysts. In this work, the lattice oxygen in (Bi_0.5Co_0.5)₂O₃ is activated through adjusting the Fermi energy level and the strong overlap between Co 3d and O 2p, by means of increasing the oxygen vacancy concentration. Compared to oxygen-vacancy-poor (Bi_0.5Co_0.5)₂O₃, the oxygen-vacancy-rich (Bi_0.5Co_0.5)₂O₃ exhibits a significantly lower Tafel slope (43 mV dec⁻¹), 15 times higher mass activity, 18 times higher turnover frequency, and excellent long-term stability in alkaline media, superior to those of the benchmark OER electrocatalyst IrO₂. This work provides a feasible strategy to activate lattice oxygen with fast OER kinetics and puts forward the development of efficient and stable catalysts towards water oxidation.

Journal of Materials Chemistry A

Activating the lattice oxygen in (Bi_0.5Co_0.5)₂O₃ by vacancy modulation for efficient electrochemical water oxidation†

Abstract

Associated articles

Supplementary files

Article information

Download Citation

Permissions

Activating the lattice oxygen in (Bi_0.5Co_0.5)₂O₃ by vacancy modulation for efficient electrochemical water oxidation

Social activity

Search articles by author

Spotlight

Advertisements

Journal of Materials Chemistry A