123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Scholars in Electrochemistry
Room No. Room 407+408
Time THU 10:00-10:10
Code ELEC.O-7
Subject A stand-alone electrocatalytic system combined arsenic oxidation and CO2 reduction
Authors Wonjung Choi, Hyunwoong Park*
School of Energy Engineering, Kyungpook National University, Korea
Abstract A stand-alone simultaneous drive system combined electrocatalytic arsenite oxidation and CO2 reduction to formate with nearly 100% Faradaic efficiencies in both reactions was first implemented. The conversion of CO2 to formate in bicarbonate solution at the circum-neutral pH was carried out on the Bi electrode synthesized onto Ti plate by electrodeposition method, and this electrocatalytic CO2 reduction reactions was combined with arsenic oxidation which performed on commercial TiO2 nanoparticle electrocatalyst (n-TEC). In half-reaction experiments performed prior to combination, As(III) oxidation and formate production were respectively optimized, and the production of As(V) and formate were enhanced by adding chloride in electrolyte. In the combination system, in order to prevent undesired re-oxidation and re-reduction in the counter electrode, both electrodes were divided by a proton-exchange membrane and different anode/cathode area ratios were applied to obtain two optimal operating conditions. It was confirmed that the simultaneous system combining each half-reactions was successfully combined without deteriorating the performance of any electrocatalytic reaction. The simultaneous system was finally designed as a stand-alone system that does not require external grid by coupling with the PV panels. This research was supported by the Basic Science Research Program (2016R1A2B4007366 and 2018R1A6A1A03024962) through the National Research Foundation, Korea.
E-mail wj19880907@gmail.com