催化作用
钴
电化学
电解
氧化钴
化学工程
材料科学
电解质
析氧
锰
电解水
分解水
纳米结构
无机化学
纳米技术
化学
电极
物理化学
冶金
有机化学
光催化
工程类
作者
Hongyao Xue,Yuandong Wang,Ziming Zhang,Xiyue Li,Jianbo Sun,Yi-Xue Zhang,Yang Bai,Zhenjiang Li
标识
DOI:10.1016/j.apsusc.2023.159058
摘要
Undesirable conductivity and insufficient electrocatalytic activity are the current bottlenecks of cobalt tetroxide from achieving efficient water electrolysis. Herein, by optimizing the internal electronic structure and the controlled design of the morphology, we design a unique hexagonal Mn-Co3O4-200 nanostructure that exhibits superior water electrolysis performance with low overpotentials and excellent long-term durability under strongly alkaline conditions, outperforming many other previously reported cobalt oxide-based compounds. Theoretical combined with characterization analysis indicates that introduced Mn atoms induce an increase in the high spin-orbital occupancy of Co2+ to optimize free energy of the OOH*→O2 step, which excites the catalytic activity of the Co sites, resulting in a substantial increase in the catalytic activity of the Mn-Co3O4. Furthermore, we briefly summarize the catalytic activity variation pattern of several catalysts with different microscopy morphologies and innovatively propose a more intuitive means to evaluate their exposed active areas. Compared with other morphologies, the special hexagonal morphology with abundant pores and large effectively exposed catalytic surface area can promote the exposure rate of active centers, mass transfer of electrolytes and diffusion of hydrogen and oxygen in the electrocatalytic process, thus accelerating the rate of electrocatalytic reactions.
科研通智能强力驱动
Strongly Powered by AbleSci AI