Citation: Rong Hu, Liyun Wei, Jinglin Xian, Guangyu Fang, Zhiao Wu, Miao Fan, Jiayue Guo, Qingxiang Li, Kaisi Liu, Huiyu Jiang, Weilin Xu, Jun Wan, Yonggang Yao. Microwave Shock Process for Rapid Synthesis of 2D Porous La_0.2Sr_0.8CoO₃ Perovskite as an Efficient Oxygen Evolution Reaction Catalyst[J]. Acta Physico-Chimica Sinica, ;2023, 39(9): 221202. doi: 10.3866/PKU.WHXB202212025 shu

Microwave Shock Process for Rapid Synthesis of 2D Porous La_0.2Sr_0.8CoO₃ Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Rong Hu ^{1, †} ,
Liyun Wei ^{1, †} ,
Jinglin Xian ^{1, †} ,
Guangyu Fang ¹ ,
Zhiao Wu ¹ ,
Miao Fan ¹ ,
Jiayue Guo ¹ ,
Qingxiang Li ¹ ,
Kaisi Liu ¹ ,
Huiyu Jiang ¹ ,
Weilin Xu ¹ ,
Jun Wan ^1,, ,
Yonggang Yao ^2,,

1.
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, Wuhan Textile University, Wuhan 430200, China
2.
State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: Jun Wan, wanj@wtu.edu.cn Yonggang Yao, yaoyg@hust.edu.cn

^†

Received Date: 16 December 2022
Revised Date: 24 January 2023
Accepted Date: 25 January 2023
Available Online: 31 January 2023
Fund Project: the National Natural Science Foundation of China 52203070Open Fund of State Key Laboratory of New Textile Materials and Advanced Processing Technologies, China FZ2022005the Open Fund of Hubei Key Laboratory of Biomass Fiber and Ecological Dyeing and Finishing, China STRZ202203

The oxygen evolution reaction (OER) is considered the rate-limiting step in electrochemical water splitting, and has been widely used to solve energy and environmental issues. Perovskite oxides (ABO₃) exhibit good OER activity, owing to their tunable electronic structures and highly flexible elemental compositions. However, the preparation of perovskite oxides usually requires long exposure to high temperatures, resulting in metal agglomeration and undesirable effects on intrinsic activity. Vapor-phase microwave technology can significantly reduce the duration of heat treatment and subsequently reduce the associated carbon emissions. This technology not only addresses the growing demand for carbon-neutral processes but also enables increased control of the synthesis to avoid undesirable agglomeration of the product. In this study, a 2D porous La_0.2Sr_0.8CoO₃ perovskite was rapidly prepared using a microwave shock method. The rapid entropy increase associated with the microwave process can effectively expose abundant active sites in the La_0.2Sr_0.8CoO₃ structure. Furthermore, the high-energy microwave shock process can precisely introduce Sr²⁺ into the lattice of LaCoO₃, increasing the number of oxygen vacancies by increasing the oxidation state of Co. The oxygen vacancies introduced by replacing La with Sr can considerably improve the intrinsic catalytic activity of the material. For the OER in alkaline electrolytes, the prepared La_0.2Sr_0.8CoO₃ catalyst displayed an excellent overpotential of 360 mV at 10 mA·cm⁻² and a Tafel slope of 76.6 mV·dec⁻¹. After a long-term cycle test of 30000 s, 97% of the initial current density was maintained. This study presents a facile and rapid strategy for the synthesis of highly active 2D perovskites.
- Two-dimensional,
- Perovskite,
- Microwave,
- Oxygen vacancy,
- Oxygen evolution reaction
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Microwave Shock Process for Rapid Synthesis of 2D Porous La0.2Sr0.8CoO3 Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

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通讯作者: 陈斌, bchen63@163.com

Microwave Shock Process for Rapid Synthesis of 2D Porous La_0.2Sr_0.8CoO₃ Perovskite as an Efficient Oxygen Evolution Reaction Catalyst