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Crystal facet engineering of perovskite cobaltite with optimized electronic regulation for water splitting

晶面工程优化钴基钙钛矿电子结构及其电解水性能

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Abstract

The correlation between crystal facets and electronic configurations of perovskite is closely related to the intrinsic activity for water splitting. Herein, we proposed a unique molten-salt method (MSM) to manipulate the electronic properties of LaCoO3 by fine-tuning its crystal facet and atomic doping. LaCoO3 samples with oriented (110) (LCO (110)) and (111) (LCO (111)) facets were motivated by a capping agent (Sr2+). Compared with the LCO (111) plane, the LCO (110) and Sr-doped LCO (111) (LSCO (111)) planes possessed higher O 2p positions, stronger Co 3d–O 2p covalencies, and higher Co spin states by inducing CoO6 distortion, thus leading to superior oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances. Specifically, the overpotentials at 10 mA cm−2 were 299, 322, and 289 mV for LCO (110), LCO (111), and LSCO (111), respectively. In addition, the (110) crystal facet and Sr substitution bestowed enhanced stability on LaCoO3 due to the strengthened Co–O bonding. The present work enlightens new avenues of regulating electronic properties by crystal facet engineering and atom doping and provides a valuable reference for the electron structure-electrocatalytic activity connection for OER and HER.

摘要

钴基钙钛矿催化剂的晶面和电子构型与其本征电解水活性密切相关. 本文中, 我们提出了一种独特的熔盐方法以调控LaCoO3的晶面类型和原子掺杂, 进而调制其电子结构. 通过引入封端剂(Sr2+), 我们制备了具有特定(110)晶面(LCO (110))和(111)晶面(LCO (111))的LaCoO3样品. 与LCO (111)相比, CoO6八面体的畸变使LCO (110)和LSCO (111)具有更高的O 2p位置、更强的Co 3d–O 2p共价性以及更高的Co自旋态,从而具有更优的析氧反应(OER)和析氢反应(HER)性能. 其中, LCO(110)、LCO (111)和LSCO (111)在10 mA cm−2处的过电位分别为299,322和289 mV. 此外, (110)晶面和Sr掺杂使Co–O键能增强, 进而提升了LaCoO3的稳定性. 本工作通过晶面工程和原子掺杂为电子结构的调控开辟了新的途径, 并为阐明OER和HER催化剂的电子结构-电催化活性关系提供了参考.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (52174283).

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Authors and Affiliations

Authors

Contributions

Zhou YN conducted the experiment and wrote the paper; Wang FG and Zhen YN performed the characterization measurements. Nan J carried out some data analysis and proposed valuable suggestions. Dong B and Chai YM designed and supervised this study. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Bin Dong  (董斌) or Yong-Ming Chai  (柴永明).

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Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Ya-Nan Zhou received her bachelor’s degree of engineering from Qingdao University of Science and Technology in 2019. She is pursuing her doctor degree under the supervision of Prof. Yong-Ming Chai and Bin Dong in the State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China). Her primary research interests focus on electrochemical and photoelectrochemical water splitting.

Bin Dong received his PhD degree from Lanzhou University in 2008. He was doing research as a visiting scholar at Marquette University from 2014.03 to 2015.03. He is an associate professor at the College of Chemistry and Chemical Engineering, China University of Petroleum (East China). His research interests focus on the designing and synthesis of functional materials for energy conversion and storage inclduing electrocatalysts and photoelectrocatalysts for water splitting.

Yong-Ming Chai received his PhD degree from China University of Petroleum (East China) in 2008. Now he is a professor at the State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China). He was doing research as a visiting scholar at Marquette University from 2015.03 to 2016.03. His research interests are the catalysts for the hydrodesulfurization process of heavy oil and transition metal-based electrocatalysts for green hydrogen.

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Zhou, YN., Wang, FG., Zhen, YN. et al. Crystal facet engineering of perovskite cobaltite with optimized electronic regulation for water splitting. Sci. China Mater. 65, 2665–2674 (2022). https://doi.org/10.1007/s40843-022-2016-5

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