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An Electrochemical Study on Hydrogen Evolution and CO2 Reduction at Pt Electrode in Acid Solutions with different pH
陈艳霞
Author NameAffiliationE-mail
陈艳霞 中国科学技术大学化学物理系 yachen@ustc.edu.cn 
Abstract:
Hydrogen evolution reaction (HER) is the major cathodic reaction which competes CO2 reduction reaction (CO2 RR) at Pt electrode. Molecular level understanding on how these two reactions intervene with each other and on what are the key factors which govern CO2 RR kinetics and selectivity will be of great help in optimizing electrolysers for CO2 reduction. In this contribution, we report our results on hydrogen evolution and CO2 reduction at Pt(111) and Pt film electrode in CO2 saturated acid solution by cyclic voltammetry and infrared spectroscopy. We found that: i) In solution with pH>2, the major process is HER and the interfacial pH increases abruptly during HER, which cannot be buffered by CO2; ii) COad is the only adsorbed intermediates detected in CO2 reduction by infrared spectroscopy; iii)The rate for COad formation increases with the coverage of UPD-H and reaches maximum at the onset potential for HER; iv)The decrease of COad formation under HER is attributed to the limited sites available and the limited residence time for the reduction intermediates (Had) necessary for CO2 adsorption and reduction.
Key words:  hydrogen evolution reaction, CO2 Reduction, Pt(111), acidic solution, pH effect, infrared spectroscopy
FundProject:
An Electrochemical Study on Hydrogen Evolution and CO2 Reduction at Pt Electrode in Acid Solutions with different pH
陈艳霞
摘要:
Hydrogen evolution reaction (HER) is the major cathodic reaction which competes CO2 reduction reaction (CO2 RR) at Pt electrode. Molecular level understanding on how these two reactions intervene with each other and on what are the key factors which govern CO2 RR kinetics and selectivity will be of great help in optimizing electrolysers for CO2 reduction. In this contribution, we report our results on hydrogen evolution and CO2 reduction at Pt(111) and Pt film electrode in CO2 saturated acid solution by cyclic voltammetry and infrared spectroscopy. We found that: i) In solution with pH>2, the major process is HER and the interfacial pH increases abruptly during HER, which cannot be buffered by CO2; ii) COad is the only adsorbed intermediates detected in CO2 reduction by infrared spectroscopy; iii)The rate for COad formation increases with the coverage of UPD-H and reaches maximum at the onset potential for HER; iv)The decrease of COad formation under HER is attributed to the limited sites available and the limited residence time for the reduction intermediates (Had) necessary for CO2 adsorption and reduction.
关键词:  hydrogen evolution reaction, CO2 Reduction, Pt(111), acidic solution, pH effect, infrared spectroscopy
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