Breaking the Local Symmetry of LiCoO2 via Atomic Doping for Efficient Oxygen Evolution
- 影响因子：11.189
- DOI码：10.1021/acs.nanolett.9b0352310.1021/acs.nanolett.9b03523
- 发表刊物：Nano Lett.
- 关键字：Symmetry, atomic doping, LiCoO2, oxygen evolution reaction
- 摘要：The obstacle for efficient electrochemical water splitting lies in the kinetically sluggish oxygen evolution reaction. Despite the various efforts that have been made to understand and tune the active sites for oxygen evolution reaction, an insight into the configurations of active sites from the electronic perspective is still lacking. Here, we report an atomic doping strategy to break the Oh symmetry of the CoO6 octahedron in LiCoO2. The specific activity of the La-doped LiCoO2 was 3.14 mA cm–2 at the overpotential of 0.35 V, which was 8.3 times higher than that of pristine LiCoO2. The overpotential with a value of 330 mV at 10 mA cm–2 was the lowest among the LiCoO2-based OER electrocatalysts ever reported. Mechanistic studies revealed that the superior activity originated from the asymmetric octahedral coordination of Co, resulting in the enhanced electronic conductivity and Co–O hybridization for the accelerated oxygen evolution kinetics. This work opens a door to enhance the catalytic performance through the manipulation of local symmetry.
- 合写作者：Pengfei Gao, Yulin Liu, Fangning Ren, Yifeng Zhu, Cong Cao, Wensheng Yan, Rui Si
- 第一作者：Zhirong Zhang, Chunxiao Liu, Chen Feng
- 通讯作者：Jie Zeng Shiming Zhou
- 卷号：19
- 期号：12
- 页面范围：8774-8779
- ISSN号：1530-6984
- 是否译文：否
- 发表时间：2019/11/01
- 发布期刊链接：https://pubs.acs.org/doi/full/10.1021/acs.nanolett.9b03523
