Surface-Enhanced Raman Spectroscopic Evidence of Key Intermediate Species and Role of NiFe Dual-Catalytic Center in Water Oxidation

被引：254

作者：

Hu, Cejun ^{[1
]}

Hu, Yanfang ^{[1
]}

Fan, Chenghao ^{[1
]}

Yang, Ling ^{[1
]}

Zhang, Yutong ^{[1
]}

Li, Haixia ^{[1
]}

Xie, Wei ^{[1
]}

机构：

[1] Nankai Univ, Coll Chem, Renewable Energy Convers & Storage Ctr, Key Lab Adv Energy Mat Chem,Minist Educ, Weijin Rd 94, Tianjin 300071, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2021年 / 60卷 / 36期

基金：

中国国家自然科学基金;

关键词：

intermediates; oxygen evolution reaction; superstructure; surface-enhanced Raman spectroscopy; ELECTROCHEMICAL EVOLUTION; OXYGEN REDUCTION; OXIDE CATALYSTS; FE-SITES; SCATTERING;

D O I：

10.1002/anie.202103888

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

NiFe-based electrocatalysts have attracted great interests due to the low price and high activity in oxygen evolution reaction (OER). However, the complex reaction mechanism of NiFe-catalyzed OER has not been fully explored yet. Detection of intermediate species can bridge the gap between OER performances and catalyst component/structure properties. Here, we performed label-free surface-enhanced Raman spectroscopic (SERS) monitoring of interfacial OER process on Ni3FeOx nanoparticles (NPs) in alkaline medium. By using bifunctional Au@Ni3FeOx core-satellite superstructures as Raman signal enhancer, we found direct spectroscopic evidence of intermediate O-O- species. According to the SERS results, Fe atoms are the catalytic sites for the initial OH- to O-O- oxidation. The O-O- species adsorbed across neighboring Fe and Ni sites experiences further oxidation caused by electron transfer to Ni-III and eventually forms O-2 product.

引用

页码：19774 / 19778

页数：5

共 59 条

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