120th General Meeting of the KCS

Type Oral Presentation
Area Current Trends in Environmental and Energy Chemistry
Room No. Room 301
Time THU 10:10-:
Code ENVR.O-5
Subject Electrochemical CO2 conversion in aqueous solution via Copper Cluster
Authors Yong-Jin Lee, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
Abstract Many efforts are underway to convert carbon dioxide, a major contributor to global warming, into useful chemicals. Among them, conversion of carbon dioxide by an electrochemical method is known as a promising method, but since carbon dioxide itself is very stable and relatively inert, a lot of energy input is required for the CO2 conversion. We have recently found that the application of Cu32 clusters, whose structure is well defined, as an electrochemical catalyst, can convert the carbon dioxide in aqueous solution from low potential to formic acid. Previous computational chemistry studies have shown that the presence of hydride in the lattice structure of Cu32 can provide the proton necessary for the conversion of carbon dioxide, especially in the form of formic acid production in competition with carbon monoxide and hydrogen. Therefore, Cu32 clusters were used as a catalyst for the electrochemical conversion of carbon dioxide. In this study, carbon paper casted with Cu32 was used as a working electrode and the formation of carbon monoxide, hydrogen and formic acid were detected by gas chromatography and NMR. As a result, the Cu32 Cluster produces HCOOH (as HCOO- at pH 6.8) at low overpotentials (89% at 0.3 V and 83% at 0.4 V), with minor amounts of CO and H2. Thus, the present experimental results can provide a mechanism for the unique selectivity of the transition metal-based carbon dioxide conversion process having a hydride form.
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