Gao Liangjuan, Jia Yifan, Jia Hongxing
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China.
Molecules. 2025 Aug 1;30(15):3238. doi: 10.3390/molecules30153238.
The usage of fossil fuels has resulted in increasingly severe environmental problems, such as climate change, air pollution, water pollution, etc. Hydrogen energy is considered one of the most promising clean energies to replace fossil fuels due to its pollution-free and high-heat properties. However, the oxygen evolution reaction (OER) remains a critical challenge due to its high overpotential and slow kinetics during water electrolysis for hydrogen production. Electrocatalysts play an important role in lowering the overpotential of OER and promoting the kinetics. CoO-based electrocatalysts have emerged as promising candidates for the oxygen evolution reaction (OER) due to their favorable catalytic activity and good compatibility compared with precious metal-based electrocatalysts. This review presents a summary of the recent developments in the synthesis strategies and mechanisms of CoO-based electrocatalysts for the OER. Various synthesis strategies have been explored to control the size, morphology, and composition of CoO nanoparticles. These strategies enable the fabrication of well-defined nanostructures with enhanced catalytic performance. Additionally, the mechanisms of OER catalysis on CoO-based electrocatalysts have been elucidated. Coordinatively unsaturated sites, synergistic effects with other elements, surface restructuring, and pH dependency have been identified as crucial factors influencing the catalytic activity. The understanding of these mechanisms provides insights into the design and optimization of CoO-based electrocatalysts for efficient OER applications. The recent advancements discussed in this review offer valuable perspectives for researchers working on the development of electrocatalysts for the OER, with the goal of achieving sustainable and efficient energy conversion and storage systems.
化石燃料的使用导致了日益严重的环境问题，如气候变化、空气污染、水污染等。由于氢能无污染且热值高，它被认为是最有前途的替代化石燃料的清洁能源之一。然而，在水电解制氢过程中，析氧反应（OER）因其高过电位和缓慢的动力学仍然是一个关键挑战。电催化剂在降低OER过电位和促进动力学方面起着重要作用。与贵金属基电催化剂相比，基于CoO的电催化剂因其良好的催化活性和兼容性，已成为析氧反应（OER）有前景的候选材料。本文综述了基于CoO的OER电催化剂合成策略和机理的最新进展。人们探索了各种合成策略来控制CoO纳米颗粒的尺寸、形态和组成。这些策略能够制备出具有增强催化性能的明确纳米结构。此外，还阐明了基于CoO的电催化剂上OER催化的机理。配位不饱和位点、与其他元素的协同效应、表面重构和pH依赖性已被确定为影响催化活性的关键因素。对这些机理的理解为设计和优化用于高效OER应用的基于CoO的电催化剂提供了见解。本文综述中讨论的最新进展为致力于开发OER电催化剂的研究人员提供了有价值的观点，目标是实现可持续和高效的能量转换与存储系统。
