期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 61, 期 -, 页码 23-26出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.09.019
关键词
Oxygen evolution reaction; Tafel slope; Reaction mechanism; Quasi-equilibrium; Electrocatalysis
Tafel slope analysis is a powerful tool in comparing experimental data to a proposed reaction mechanism. Typically, in order to simplify the analysis, the non-rate-determining, steps in the reaction mechanism are assumed to be in quasi-equilibrium. Here, Tafel analysis of the oxygen evolution reaction following the electrochemical oxide mechanism is performed using a full kinetic model. It is shown that this model (which uses the steady-state assumption) predicts a larger number of Tafel slopes than if the quasi-equilibrium assumption is used and provides and predicts the surface coverages which underpin these Tafel slopes. Importantly, this model predicts Tafel slopes of 30, 40, 60, and 120 my, all of which are experimentally found on IrO2 and RuO2 anodes. Models using the quasi-equilibrium assumption fail to predict some Tafel regions, as these can occur When a non-rate-determining step is not at quasi-equilibrium. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据