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Electrochemical CO2 reduction on Pd-modified Cu foil
陈艳霞
Author NameAffiliationE-mail
陈艳霞 Hefei National Lab for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China yachen@ustc.edu.cn 
Abstract:
Bimetallic catalysts can improve CO2 reduction efficiency by combining the properties of two metals. Pd strongly adsorbs the CO2 reduction intermediate, CO, but has low activity for subsequent reactions. PdCu shows enhanced activity relative to copper alone. We studied this using differential electrochemical mass spectrometry (DEMS) and electrochemical IR spectroscopy to measure volatile products and adsorbed intermediates during CO2 and CO reduction on Cu and CuPd. Bands around 3000 cm-1 attributed to adsorbed CHx on Cu are detected during CO2 and CO reduction. They are probably the intermediates for production of CH3OH, CH4 and C2H4. The IR band of adsorbed CO appears 300 mV more positive on CuPd than on Cu, indicating acceleration of the initial reduction step. Electrochemical IR spectroscopy in CO-saturated solutions revealed similar potentials for CO adsorption and CO32- desorption on CuPd and Cu, indicating that CO adsorption is controlled by desorption of CO32-. DEMS measurements during CO reduction at both electrodes showed that the onset potential for reduction of CO to methane and methanol on CuPd is about 200 mV more positive than on Cu. We attribute these improvements to interaction of Cu and Pd, which shifts the d-band of the Cu sites.
Key words:  CO2 reduction, CH band, CuPd activity, Differential Electrochemical Mass Spectrometry, Attenuated Total Reflection Fourier Transform Infrared Spectroscopy
FundProject:
Electrochemical CO2 reduction on Pd-modified Cu foil
陈艳霞
摘要:
Bimetallic catalysts can improve CO2 reduction efficiency by combining the properties of two metals. Pd strongly adsorbs the CO2 reduction intermediate, CO, but has low activity for subsequent reactions. PdCu shows enhanced activity relative to copper alone. We studied this using differential electrochemical mass spectrometry (DEMS) and electrochemical IR spectroscopy to measure volatile products and adsorbed intermediates during CO2 and CO reduction on Cu and CuPd. Bands around 3000 cm-1 attributed to adsorbed CHx on Cu are detected during CO2 and CO reduction. They are probably the intermediates for production of CH3OH, CH4 and C2H4. The IR band of adsorbed CO appears 300 mV more positive on CuPd than on Cu, indicating acceleration of the initial reduction step. Electrochemical IR spectroscopy in CO-saturated solutions revealed similar potentials for CO adsorption and CO32- desorption on CuPd and Cu, indicating that CO adsorption is controlled by desorption of CO32-. DEMS measurements during CO reduction at both electrodes showed that the onset potential for reduction of CO to methane and methanol on CuPd is about 200 mV more positive than on Cu. We attribute these improvements to interaction of Cu and Pd, which shifts the d-band of the Cu sites.
关键词:  CO2 reduction, CH band, CuPd activity, Differential Electrochemical Mass Spectrometry, Attenuated Total Reflection Fourier Transform Infrared Spectroscopy
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