121st General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ENVR.P-659
Subject Electrochemical CO2 Conversion in Aqueous Solution via Metal Nanoclusters (Au25, PtAu24, Cu32)
Authors Yongjin Lee, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
Abstract As fossil fuel consumption increases atmospheric CO2 concentrations, global warming is occurring. And the lots of efforts are underway to capture and convert carbon dioxide to cope with this climate change. Among them, carbon dioxide conversion through electrocatalysis is a promising field of research. However, for a more effective and feasible electrochemical catalyst system, the catalyst must be capable of producing valuable products with high selectivity. In this presentation, we show an electrochemical conversion system of carbon dioxide using a metal-based cluster(Au25, PtAu24, Cu32) as a catalyst. The metal nanoclusters were immobilized on a carbon-based electrode and these nanoclusters converted carbon dioxide filled in an aqueous solution(pH=7). We found that Au25 exhibits more than 90% faradaic efficiency for CO at 0.4 V overpotential through constant potential electrolysis. However, the results of the PtAu24 cluster show a high selectivity for hydrogen evolution under the same experimental conditions. In the partial current analysis, Au25 and PtAu24 were found to be selective for CO and H2, respectively. And that the proper mixing of the two clusters(Au25, PtAu24) can regulate the production rates of CO and H2 similar to syngas ratio(H2/CO = 1~4). Finally, it was confirmed that formic acid, a high-value compound, can be produced with a faraday efficiency close to 90% at an overpotential of 0.4 V by using a Cu32 cluster. The work described here demonstrates the potential for a feasible electrocatalytic system as well as a more meaningful understanding of the CO2 conversion reaction via metal nanoclusters.
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