析氧
过电位
催化作用
化学
电化学
法拉第效率
循环伏安法
钌
阳极
电催化剂
无机化学
化学工程
电极
物理化学
有机化学
工程类
作者
Jianfeng Huang,Søren B. Scott,Ib Chorkendorff,Zhenhai Wen
出处
期刊:ACS Catalysis
日期:2021-10-05
卷期号:11 (20): 12745-12753
被引量:19
标识
DOI:10.1021/acscatal.1c03430
摘要
Electrocatalytic current density and especially onset potential or overpotential, as the key parameters for evaluating electrocatalytic performance, are problematic metrics when electron-consuming side processes can take place. This includes the widely studied electrocatalytic oxygen evolution reaction (OER), which is often accompanied by anodic currents associated with the activation or degradation of the catalyst and/or support. Herein, we use an online chip-based electrochemistry–mass spectrometry (chip EC-MS) system to decouple the OER from the complex electrochemical reactions for a graphene-supported ruthenium (Ru) catalyst with high OER activity in an acidic medium. In this manner, we can quantitatively evaluate the current contribution from the OER during cyclic voltammetry (CV) tests and chronopotentiometry (CP) tests and are thus enabled to realize the accurate measurement of the onset potential and Faradaic efficiency (FE) toward the OER. The OER process, including the activation, steady-state, and degradation processes, as well as the side reaction, is also studied using such a chip EC-MS technique. This work is of practical importance to clarify some critical issues remaining in the study of OER electrocatalysis.
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