Mechanism in pH effects of electrochemical reactions: a mini-review

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-04-18 DOI:10.1007/s42823-024-00724-2

Sibei Liu, Zhuowen Wang, Shan Qiu, Fengxia Deng

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Abstract

pH plays a pivotal role in influencing various aspects of proton-coupled electron transfer (PCET) reactions in electrochemical systems. These reactions are affected by pH in terms of mass transport, electrochemical double layer (EDL) structure, and surface adsorption energy, all of which impact the overall electrochemical processes. This review article aims to provide a comprehensive understanding of the research progress made in elucidating the effects of pH on different electrochemical reactions, the hydrogen evolution reaction/hydrogen oxidation reaction (HER/HOR), oxygen reduction reaction/oxygen evolution reaction (ORR/OER), and carbon dioxide reduction reaction (CO₂RR). To embark on this endeavor, we have conducted a bibliometric analysis to clearly outline of the research trends and advancements in the field concerning the pH effects. Subsequently, we present a systematic overview of the mechanisms governing these reactions, with a special focus on pH’s influence on both the proton and electron aspects. We conclude by discussing the current challenges in this area and suggesting future research avenues that could further our understanding of pH's role in electrochemical reactions.

Graphical abstract

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电化学反应的 pH 值效应机制：微型综述

pH 值在影响电化学系统中质子耦合电子转移（PCET）反应的各个方面起着举足轻重的作用。这些反应在质量传输、电化学双层（EDL）结构和表面吸附能等方面都会受到 pH 值的影响，而所有这些因素都会对整个电化学过程产生影响。本综述文章旨在全面介绍在阐明 pH 值对不同电化学反应（氢进化反应/氢氧化反应 (HER/HOR)、氧还原反应/氧进化反应 (ORR/OER) 和二氧化碳还原反应 (CO2RR) 的影响方面所取得的研究进展。为了开展这项工作，我们进行了文献计量分析，清楚地勾勒出该领域有关 pH 值效应的研究趋势和进展。随后，我们对这些反应的机理进行了系统概述，并特别关注 pH 值对质子和电子两方面的影响。最后，我们讨论了这一领域当前面临的挑战，并提出了未来的研究方向，以进一步加深我们对 pH 值在电化学反应中的作用的理解。

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

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.