120th General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code ELEC.P-481
Subject Estimation of Catalytic Activity of Gold Nanoparticles toward CO2 Reduction Using Scanning Electrochemical Microscopy
Authors YEOMIN KIM, ara jo, Youngmi Lee*, Chongmok Lee*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
Abstract Recently, CO2 reduction has attracted great attention in the field of renewable energy because the products of CO2 reduction, such as CO, CH4, HCOO– and C2H4, are useful for recyclable energy sources. In fact, the selectivity of the product is an important challenge for using it as an energy source in a practical manner. Unlike other metals, it is generally known that Au has good selectivity for CO2 reduction products. The electrochemical reduction products of CO2 at Au are known as mostly CO and H2. The selectivity of CO among CO2 reduction products could be close to 100% if CO2 reduction occurs at more positive potential than that of H2 generation. In this study, we synthesized AuNPs/CB which is nano-sized gold particles (AuNPs) on carbon black (CB). The results of the electrochemical study show that our catalyst is effective not only in oxygen reduction but also CO2 reduction. In particular, we have analyzed the electrochemical activity of AuNPs/CB toward CO2 reduction using scanning electrochemical microscopy (SECM). SECM is an electrochemical scanning probe technique where the tip current caused by an electrochemical reaction is measured. If the tip electrode moves to the substrate electrode very closely, it can re-oxidize the reduction product from substrate by control of electrode potentials via a bipotentiostat. The substrate electrode is glassy carbon electrode loaded with AuNPs/CB and the tip electrode is the electrochemical CO-sensor. Using this technique, we have tried to analyze the exact onset potential of the CO2 reduction in electrocatalytic system.
E-mail yeo028@gmail.com