Tafel Slope Plot as a Tool to Analyze Electrocatalytic Reactions

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2024-04-01 DOI:10.1021/acsenergylett.4c00266

Onno van der Heijden, Sunghak Park, Rafaël E. Vos, Jordy J. J. Eggebeen and Marc T. M. Koper*,

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Abstract

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.

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作为分析电催化反应工具的塔菲尔斜率图

使用塔菲尔斜率图可以将对塔菲尔斜率值的动力学和非动力学贡献区分开来，恒定的塔菲尔斜率区域表示动力学意义。在此，我们将线性扫描伏安法获得的塔菲尔斜率值与计时安培法和阻抗光谱法获得的值进行了比较，并将塔菲尔斜率图应用于各种电催化反应。我们发现，在 0.2 M KOH 中 NiFeOOH 的氧进化反应中，不同技术在大容量传输条件下观察到的塔菲尔斜率值相似。但是，在碱性氢进化反应和二氧化碳还原反应中，没有观察到水平的塔菲尔斜率区域。相反，在 1 M HClO4 中铂上的氢还原反应中，我们得到了 30 mV/dec 的预期塔菲尔斜率。我们认为，当传统的塔菲尔图分析不明确时，广泛应用塔菲尔斜率图或类似的数值微分技术，可以改进许多电催化反应的动力学数据比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.