Activating the lattice oxygen in (Bi0.5Co0.5)2O3by vacancy modulation for efficient electrochemical water oxidation

被引：76

作者：

Liu, Huan ^{[1
]}

Li, Xiaoning ^{[2
]}

Peng, Cailing ^{[1
]}

Zhu, Liuyang ^{[1
]}

Zhang, Yuanxi ^{[1
]}

Cheng, Huiru ^{[3
]}

Cui, Jiameng ^{[1
]}

Wu, Qingmei ^{[1
]}

Zhang, Yingying ^{[1
]}

Chen, Zezhi ^{[1
]}

Zou, Wei ^{[1
]}

Wen, Gu ^{[1
]}

Huang, Haoliang ^{[2
,4
]}

Wang, Jianlin ^{[2
,4
]}

Ye, Bangjiao ^{[3
]}

Fu, Zhengping ^{[1
,2
,4
]}

Lu, Yalin ^{[1
,2
,4
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Degradat, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

[3] Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China

[4] Univ Sci & Technol China, Anhui Lab Adv Photon Sci & Technol, Hefei 230026, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2020年 / 8卷 / 26期

基金：

中国国家自然科学基金;

关键词：

ION DIFFUSION-COEFFICIENTS; PEROVSKITE OXIDE; EVOLUTION; SURFACE;

D O I：

10.1039/d0ta03411h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (Bi0.5Co0.5)(2)O(3)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 (Bi0.5Co0.5)(2)O-3, the oxygen-vacancy-rich (Bi0.5Co0.5)(2)O(3)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.

引用

页码：13150 / 13159

页数：10

共 45 条

[1] Fundamental understanding and practical challenges of anionic redox activity in Li-ion batteries [J].