Tafel Slope Plot as a Tool to Analyze Electrocatalytic Reactions

被引:189
作者
van der Heijden, Onno [1 ]
Park, Sunghak [1 ]
Vos, Rafael E. [1 ]
Eggebeen, Jordy J. J. [1 ]
Koper, Marc T. M. [1 ]
机构
[1] Leiden Univ, Leiden Inst Chem, NL-2333 CC Leiden, Netherlands
基金
欧洲研究理事会; 新加坡国家研究基金会; 欧盟地平线“2020”; 荷兰研究理事会;
关键词
OXYGEN-EVOLUTION ELECTROCATALYSTS; HYDROGEN EVOLUTION; CO2; REDUCTION; ELECTROCHEMICAL REACTIONS; MASS-TRANSPORT; ELECTRODE; PARTICLES; IMPACT;
D O I
10.1021/acsenergylett.4c00266
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Kinetic and nonkinetic contributions to the Tafel slope value can be separated using a Tafel slope plot, where a constant Tafel slope region indicates kinetic meaningfulness. Here, we compare the Tafel slope values obtained from linear sweep voltammetry to the values obtained from chronoamperometry and impedance spectroscopy, and we apply the Tafel slope plot to various electrocatalytic reactions. We show that similar Tafel slope values are observed from the different techniques under high-mass-transport conditions for the oxygen evolution reaction on NiFeOOH in 0.2 M KOH. However, for the alkaline hydrogen evolution reaction and the CO2 reduction reaction, no horizontal Tafel slope regions were observed. In contrast, we obtained the expected Tafel slope of 30 mV/dec for the HER on Pt in 1 M HClO4. We argue that widespread application of the Tafel slope plot, or similar numerical differentiation techniques, would result in an improved comparison of kinetic data for many electrocatalytic reactions when the traditional Tafel plot analysis is ambiguous.
引用
收藏
页码:1871 / 1879
页数:9
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