Li Sicheng, Liu Tong, Zhang Wei, Wang Mingzhen, Zhang Huijuan, Qin Chunlan, Zhang Lingling, Chen Yudan, Jiang Shuaiwei, Liu Dong, Liu Xiaokang, Wang Huijuan, Luo Qiquan, Ding Tao, Yao Tao
School of Nuclear Science and Technology, Key Laboratory of Precision and Intelligent Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P.R. China.
Zhongke Enthalpy (Anhui) New Energy Technology Co. Ltd, Hefei, P.R. China.
Nat Commun. 2024 Apr 22;15(1):3416. doi: 10.1038/s41467-024-47736-0.
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 (FeCrO, CoCrO and NiCrO) 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 CoCrO anode catalyst achieves the high current density of 1.5 A cm at 2.1 V and maintains for over 120 h with attenuation less than 4.9 mV h 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.
深入理解和调控活性金属位点的电子结构对于提高其在阴离子交换膜水电解槽（AEMWEs）中电催化析氧反应（OER）的本征活性至关重要。在此，我们通过高价铬掺杂精心制备了一系列用于高性能AEMWEs的非晶态金属氧化物催化剂（FeCrO、CoCrO和NiCrO）。我们通过同步辐射原位技术发现，Co位点从低价到高价的转变对中间体吸附能的积极影响以及较低的氧化势垒是其活性增加的关键因素。特别是，CoCrO阳极催化剂在AEMWE测试中在2.1 V时实现了1.5 A cm²的高电流密度，并保持超过120 h，衰减小于4.9 mV h⁻¹。这种优异的性能展示了工业应用的广阔前景，并为高效AEMWEs系统的设计提供了通用指导。
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