Highly efficient anion exchange membrane water electrolyzers via chromium-doped amorphous electrocatalysts

Sicheng Li, Tong Liu, Wei Zhang (), Mingzhen Wang, Huijuan Zhang, Chunlan Qin, Lingling Zhang, Yudan Chen, Shuaiwei Jiang, Dong Liu, Xiaokang Liu, Huijuan Wang, Qiquan Luo, Tao Ding () and Tao Yao ()
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Sicheng Li: University of Science and Technology of China
Tong Liu: University of Science and Technology of China
Wei Zhang: University of Science and Technology of China
Mingzhen Wang: Zhongke Enthalpy (Anhui) New Energy Technology Co. Ltd
Huijuan Zhang: University of Science and Technology of China
Chunlan Qin: University of Science and Technology of China
Lingling Zhang: University of Science and Technology of China
Yudan Chen: University of Science and Technology of China
Shuaiwei Jiang: University of Science and Technology of China
Dong Liu: University of Science and Technology of China
Xiaokang Liu: University of Science and Technology of China
Huijuan Wang: University of Science and Technology of China
Qiquan Luo: Anhui University
Tao Ding: University of Science and Technology of China
Tao Yao: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract In-depth comprehension and modulation of the electronic structure of the active metal sites is crucial to enhance their intrinsic activity of electrocatalytic oxygen evolution reaction (OER) toward anion exchange membrane water electrolyzers (AEMWEs). Here, we elaborate a series of amorphous metal oxide catalysts (FeCrOx, CoCrOx and NiCrOx) with high performance AEMWEs by high-valent chromium dopant. We discover that the positive effect of the transition from low to high valence of the Co site on the adsorption energy of the intermediate and the lower oxidation barrier is the key factor for its increased activity by synchrotron radiation in-situ techniques. Particularly, the CoCrOx anode catalyst achieves the high current density of 1.5 A cm−2 at 2.1 V and maintains for over 120 h with attenuation less than 4.9 mV h−1 in AEMWE testing. Such exceptional performance demonstrates a promising prospect for industrial application and providing general guidelines for the design of high-efficiency AEMWEs systems.

Date: 2024
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DOI: 10.1038/s41467-024-47736-0

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