电催化剂
析氧
电化学
材料科学
催化作用
化学工程
吸附
原电池
曲面重建
纳米技术
化学
电极
物理化学
曲面(拓扑)
冶金
有机化学
工程类
数学
几何学
作者
Abdul Qayum,Karim Harrath,Rui Li,Abebe Reda Woldu,Paul K. Chu,Liangsheng Hu,Fushen Lu,Xiangdong Yao
出处
期刊:Small
[Wiley]
日期:2024-11-24
标识
DOI:10.1002/smll.202408854
摘要
Abstract The development of robust and efficient electrocatalysts for the oxygen evolution reaction (OER) has been the main focus of water electrolysis but remains a great challenge. Here, the synthesis of a highly active and ultra‐stable Fe‐CoOOH electrocatalyst is reported by steering raw cobalt foam via an in situ solution combustion method assisted by a galvanic replacement reaction and subsequent electrochemical reconstruction of the CoFeO x pre‐catalyst. In/ ex situ electrochemical analysis and physicochemical characterizations show that the CoFeO x undergoes quick chemical and slow morphological reconstruction to Fe‐CoOOH nanosheets. The Fe‐CoOOH possesses a semi‐crystalline nature with distinct short‐range ordering and outstanding OER activity with overpotentials as low as 271 and 291 mV at current densities of 500 and 1,000 mA cm −2 , respectively. The remarkable stability under 1,000 mA cm −2 for at least 700 h is achieved. Theoretical calculations confirm the crucial role of Fe doping in facilitating surface reconstruction, enhancing OER activity, and improving the stability of the Fe‐CoOOH. Comparative analysis with other transition metals doping reveals the unique ability of Fe to adsorb onto the CoOOH surface, thereby modulating the electronic density and facilitating faster adsorption of reaction intermediates. This work represents valuable insights into the surface reconstruction and doping processes.
科研通智能强力驱动
Strongly Powered by AbleSci AI