122nd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code ELEC.P-494
Subject Cobalt nanoparticle/sulfur-doped graphene as efficient bifunctional oxygen electrocatalysis in alkaline solution
Authors Jinheui Lee, Jun Ho Shim*
Department of Chemistry, Daegu University, Korea
Abstract Manufacture of highly active electrocatalysts for the oxygen reduction (ORR) and the oxygen evolution reaction (OER) is very important for practical application of fuel cells, metal-air batteries, and electrolyzers. Currently, Pt-based catalysts are regarded as the best ORR catalysts, but not for OER, whereas IrO2 and RuO2 are the most efficient catalysts for OER, but poor for ORR. However, the high cost of noble-metal electrocatalysts due to their limited natural reserves has greatly hindered the large-scale commercialization of energy conversion devices. Herein, we report a simple way to prepare a cobalt nanoparticle/sulfur-doped graphene nanocomposite (Co-SGN) as a bifunctional electrocatalyst for the ORR and OER. Benefiting abundant catalytic active sites and unique structural features that influence the exposure of active sites and favor electron transfer, the obtained electrocatalyst exhibits that the ORR and OER on the Co-SGN catalysts proceeded predominantly through the desired 4-electron pathway. The compositional and structural properties were characterized by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrocatalytic activity of the Co-SGN for both ORR and OER was investigated by rotating disk electrode and cyclic voltammetry. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1B03930895).
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