Pan Sanjiang, Li Hao, Liu Dan, Huang Rui, Pan Xuelei, Ren Dan, Li Jun, Shakouri Mohsen, Zhang Qixing, Wang Manjing, Wei Changchun, Mai Liqiang, Zhang Bo, Zhao Ying, Wang Zhenbin, Graetzel Michael, Zhang Xiaodan
Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, Solar Energy Research Center, Nankai University, Tianjin, 300350, PR China.
Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin, 300350, PR China.
Nat Commun. 2022 Apr 28;13(1):2294. doi: 10.1038/s41467-022-30064-6.
Developing non-noble catalysts with superior activity and durability for oxygen evolution reaction (OER) in acidic media is paramount for hydrogen production from water. Still, challenges remain due to the inadequate activity and stability of the OER catalyst. Here, we report a cost-effective and stable manganese oxybromide (MnOBr) catalyst exhibiting an excellent OER activity in acidic electrolytes, with an overpotential of as low as 295 ± 5 mV at a current density of 10 mA cm. MnOBr maintains good stability under operating conditions for at least 500 h. In situ Raman spectroscopy, X ray absorption near edge spectroscopy, and density functional theory calculations confirm that a self-oxidized surface with enhanced electronic transmission capacity forms on MnOBr and is responsible for both the high catalytic activity and long-term stability during catalysis. The development of MnOBr as an OER catalyst provides crucial insights into the design of non-noble metal electrocatalysts for water oxidation.
开发在酸性介质中对析氧反应（OER）具有优异活性和耐久性的非贵金属催化剂对于水制氢至关重要。然而，由于OER催化剂的活性和稳定性不足，挑战依然存在。在此，我们报道了一种具有成本效益且稳定的溴氧化锰（MnOBr）催化剂，其在酸性电解质中表现出优异的OER活性，在电流密度为10 mA cm时过电位低至295±5 mV。MnOBr在运行条件下保持良好稳定性至少500小时。原位拉曼光谱、X射线吸收近边光谱和密度泛函理论计算证实，MnOBr上形成了具有增强电子传输能力的自氧化表面，这是催化过程中高催化活性和长期稳定性的原因。MnOBr作为OER催化剂的开发为水氧化非贵金属电催化剂的设计提供了关键见解。
