122nd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation for Young Scientist in Environmental and Energy Chemistry
Room No. Room 306A
Time THU 09:10-:
Code ENVR.O-1
Subject Core Metal in MAu24(SR)18 Nanocluster(M=Au, Pt) Controls the Products Selectivity in Electrocatalytic CO2 Conversion
Authors Yongjin Lee, Hoeun Seong, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
Abstract Gold nanoparticles have been studied extensively as an efficient electrocatalyst for CO2 conversion. However, the electrochemical CO2 conversion on gold nanoparticles typically requires large overpotentials and the reaction products are a mix of major and minor products, including CO and hydrogen. In this poster, we report that the product selectivity can be controlled by the core dopant of MAu24(SR)18 (M= Au, Pt), where SR is 1-hexanethiol. Linear Sweep Voltammetry studies show that the onset potential of CO2 reduction catalyzed by Au25(SR)18 is significantly different from that by PtAu24(SR)18. Furthermore, constant potential electrolysis on electrodes modified with these clusters exhibits drastically different product selectivity. That is, whereas CO is predominantly produced on Au25(SR)18 with a selectivity higher than 90 %, nearly 75 % H2 is produced on PtAu24(SR)18. Density functional theory (DFT) calculations show that the product selectivity appears to be closely related with the adsorption energies of the reactants, i.e., CO2 and proton on the cluster catalyst.
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