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

Artículo

pH plays a pivotal role in infuencing various aspects of proton-coupled electron transfer (PCET) reactions in electrochemical systems. These reactions are afected 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 efects of pH on diferent 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 feld concerning the pH efects. Subsequently, we present a systematic overview of the mechanisms governing these reactions, with a special focus on pH's infuence 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.