Enhancing selectivity in acidic CO2 electrolysis:Cation effects and catalyst innovation
The electrochemical reduction of CO2(eCO2R)under ambient conditions is crucial for reducing carbon emissions and achieving carbon neutrality.Despite progress with alkaline and neutral elec-trolytes,their efficiency is limited by(bi)carbonates formation.Acidic media have emerged as a solution,addressing the(bi)carbonates challenge but introducing the issue of the hydrogen evolu-tion reaction(HER),which reduces CO2 conversion efficiency in acidic environments.This review focuses on enhancing the selectivity of acidic CO2 electrolysis.It commences with an overview of the latest advancements in acidic CO2 electrolysis,focusing on product selectivity and electrocatalytic activity enhancements.It then delves into the critical factors shaping selectivity in acidic CO2 elec-trolysis,with a special emphasis on the influence of cations and catalyst design.Finally,the research challenges and personal perspectives of acidic CO2 electrolysis are suggested.
Acidic CO2 electrolysisHigh selectivityCation effectsCatalyst designCompetitive HER
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