An Li, Zhang Hong, Zhu Jiamin, Xi Shibo, Huang Bolong, Sun Mingzi, Peng Yong, Xi Pinxian, Yan Chun-Hua
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
Electron Microscopy Centre of Lanzhou University, School of Materials and Energy, Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China.
Angew Chem Int Ed Engl. 2023 Jan 16;62(3):e202214600. doi: 10.1002/anie.202214600. Epub 2022 Dec 8.
Designing active and stable oxygen evolution reaction (OER) catalysts are vitally important to various energy conversion devices. Herein, we introduce elements Ni and Mn into (Co) (Co ) O nanosheets (NSs) at fixed geometrical sites, including Mn , Ni , and Ni , to optimize the initial geometrical structure and modulate the CoCo O surface from oxygen-excess to oxygen-deficiency. The pristine (Ni,Mn)-(Co) (Co ) O NSs shows excellent OER activity with an overpotential of 281.6 mV at a current density of 10 mA cm . Moreover, without damaging their initial activity, the activated (Act)-(Ni,Mn)-(Co) (Co ) O NSs after surface reconstruction exhibit long-term stability of 100 h under 10 mA cm , 50 mA cm , or even 100 mA cm . The optimal balance between electroactivity and stability leads to remarkable OER performances, providing a pivotal guideline for designing ideal electrocatalysts and inspiring more works to focus on the dynamic change of each occupation site component.
设计活性和稳定的析氧反应（OER）催化剂对于各种能量转换装置至关重要。在此，我们将元素Ni和Mn引入到（Co）（Co）O纳米片（NSs）的固定几何位点，包括Mn、Ni和Ni，以优化初始几何结构并将CoCoO表面从富氧调节为缺氧。原始的（Ni，Mn）-（Co）（Co）O NSs在电流密度为10 mA cm时表现出优异的OER活性，过电位为281.6 mV。此外，表面重构后的活化（Act）-（Ni，Mn）-（Co）（Co）O NSs在不损害其初始活性的情况下，在10 mA cm、50 mA cm甚至100 mA cm下表现出100 h的长期稳定性。电活性和稳定性之间的最佳平衡导致了卓越的OER性能，为设计理想的电催化剂提供了关键指导，并激励更多工作关注每个占据位点组分的动态变化。
