Zhao Yajun, Zheng Guocai, Li Guofei, Liu Hanqing, Li Xiaojing
School of Automotive Engineering, Hefei Technology College, Hefei, 230012, Anhui, China.
Sci Rep. 2025 Jul 15;15(1):25627. doi: 10.1038/s41598-025-11449-1.
Li-O batteries have attracted increasing attention due to their high theoretical specific capacity. However, their practical application is limited by factors such as excessively high overpotential and poor rate and cycle performance. It is crucial to find high-efficiency catalysts to improve the kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as well as to provide sufficient space to store undecomposed LiO. In this report, we use a simple hydrothermal synthesis method to compound RuO particles on the surface of CoO using the ZIF-8@ZIF-67 double metal-organic frameworks (MOFs) structure as a template. The CoO/RuO material exhibits excellent bifunctional catalytic performance for both ORR and OER, with improved onset potential and half-wave potential comparable to commercial Pt/C. Meanwhile, the Li-O battery demonstrates a high specific capacity of 11,304 mA h g, excellent rate performance, and outstanding cycle stability.
锂-氧电池因其高理论比容量而受到越来越多的关注。然而，它们的实际应用受到诸如过高的过电位、较差的倍率性能和循环性能等因素的限制。找到高效催化剂以改善氧还原反应（ORR）和析氧反应（OER）的动力学，以及提供足够空间来存储未分解的LiO至关重要。在本报告中，我们以ZIF-8@ZIF-67双金属有机框架（MOF）结构为模板，采用简单的水热合成方法在CoO表面复合RuO颗粒。CoO/RuO材料对ORR和OER均表现出优异的双功能催化性能，其起始电位和半波电位得到改善，与商业Pt/C相当。同时，锂-氧电池表现出11304 mA h g的高比容量、优异的倍率性能和出色的循环稳定性。
