过电位
塔菲尔方程
析氧
尖晶石
双金属片
材料科学
八面体
氧化物
过渡金属
密度泛函理论
纳米笼
分解水
无机化学
纳米技术
晶体结构
催化作用
物理化学
金属
化学
结晶学
电化学
计算化学
电极
冶金
光催化
生物化学
作者
Yi Lv,Shuai Wei,Shasha Yi,Yan‐Xin Duan,Rong‐Chao Cui,Guang Yang,Zhongyi Liu,Jing‐Huo Chen,Xinzheng Yue
出处
期刊:Small
[Wiley]
日期:2024-07-01
标识
DOI:10.1002/smll.202402402
摘要
Abstract Doping transition metal oxide spinels with metal ions represents a significant strategy for optimizing the electronic structure of electrocatalysts. Herein, a bimetallic Fe and Ru doping strategy to fine‐tune the crystal structure of CoV 2 O 4 spinel for highly enhanced oxygen evolution reaction (OER) is presented performance. The incorporation of Fe and Ru is observed at octahedral sites within the CoV 2 O 4 structure, effectively modulating the electronic configuration of Co. Density functional theory calculations have confirmed that Fe acts as a novel reactive site, replacing V. Additionally, the synergistic effect of Fe, Co, and Ru effectively optimizes the Gibbs free energy of the intermediate species, reduces the reaction energy barrier, and accelerates the kinetics toward OER. As expected, the best‐performing CoVFe 0.5 Ru 0.5 O 4 displays a low overpotential of 240 mV (@10 mA cm −2 ) and a remarkably low Tafel slope of 38.9 mV dec −1 , surpassing that of commercial RuO 2 . Moreover, it demonstrates outstanding long‐term durability lasting for 72 h. This study provides valuable insights for the design of highly active polymetallic spinel electrocatalysts for energy conversion applications.
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