In-situ ECSTM investigation of H2O2 production in cobalt–porphyrin-catalyzed oxygen reduction reaction

被引：1

作者：

Ya-Chen Feng ^{[1
,2
]}

Xiang Wang ^{[1
]}

Zhen-Yu Yi ^{[1
,2
]}

Yu-Qi Wang ^{[1
,2
]}

Hui-Juan Yan ^{[1
,2
]}

Dong Wang ^{[1
,2
]}

机构：

[1] CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,CAS Research/Education Center for Excellence in Molecular Sciences,Beijing National Laboratory for Molecular Science (BNLMS),Institute of Chemistry,Chinese Academy of Sciences

[2] University of Chinese Academy of Sciences

来源：

Science China(Chemistry) | 2023年 / 66卷 / 01期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

D O I：

暂无

中图分类号：

TQ123.6 [过氧化氢]; TQ426 [催化剂（触媒）];

学科分类号：

080502 ; 0817 ; 081705 ;

摘要：

We report the in-situ investigation of the production of H2O2in 5,10,15,20-tetra(4-methoxyphenyl)-21H,23H-porphyrin cobalt(Ⅱ)(Co TMPP)-catalyzed oxygen reduction reaction(ORR) in neutral electrolytes by electrochemical scanning tunneling microscopy(ECSTM) at the molecular scale.The adsorption of OOH-on active sites can be observed in STM images and is found to be correlated with the pH value of the electrolyte.The thermodynamic parameters of the formation of Co TMPP–OOHcomplex are extracted by the quantitative analysis of the STM images.Two stages of the ORR including the formation of H2O2and further reduction of H2O2at different reduction potentials can be revealed by electrochemical measurements.In-situ ECSTM experiments unambiguously identify the formation of the Co TMPP–OOH-complex as the high contrast species and its reduction and oxidation process.This work provides the direct evidence for understanding the formation and transformation process of H2O2at the molecular scale,which benefits the rational design of the high-efficiency electrocatalysts for ORR and H2O2production.

引用

页码：273 / 278

页数：6