电催化剂
石墨烯
钴
材料科学
催化作用
碳纤维
量子点
电子转移
析氧
氧气
化学工程
无机化学
化学
纳米技术
光化学
电极
电化学
有机化学
物理化学
复合材料
复合数
工程类
作者
Di Geng,Yichao Huang,Saifei Yuan,Ye Jiang,Hao Ren,Su Zhang,Zheng Liu,Jing Feng,Tong Wei,Zhuangjun Fan
出处
期刊:Small
[Wiley]
日期:2023-01-31
卷期号:19 (18)
被引量:22
标识
DOI:10.1002/smll.202207227
摘要
Abstract Developing efficient and robust metal–nitrogen–carbon electrocatalysts for oxygen reduction reaction (ORR) is of great significance for the application of hydrogen–oxygen fuel cells and metal–air batteries. Herein, a coordination engineering strategy is developed to improve the ORR kinetics and stability of cobalt–nitrogen–carbon (Co–N–C) electrocatalysts by grafting the oxygen‐rich graphene quantum dots (GQDs) onto the zeolite imidazole frameworks (ZIFs) precursors. The optimized oxygen‐rich GQDs‐functionalized Co–N–C (G‐CoNOC) electrocatalyst demonstrates an increased mass activity, nearly two times higher than that of pristine defective Co–N–C electrocatalyst, and retains a stability of 90.0% after 200 h, even superior to the commercial Pt/C. Comprehensive investigations demonstrate that the GQDs coordination can not only decrease carbon defects of Co–N–C electrocatalysts, improving the electron transfer efficiency and resistance to the destructive free radicals from H 2 O 2 , but also optimize the electronic structure of atomic Co active site to achieve a desired adsorption energy of OOH − , leading to enhanced ORR kinetics and stability by promoting further H 2 O 2 reduction, as confirmed by theoretical calculations and experimental results. Such a coordination engineering strategy provides a new perspective for the development of highly active noble‐metal‐free electrocatalysts for ORR.
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