123rd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Exhibition Hall 2
Time 4월 18일 (목요일) 11:00~12:30
Code ELEC.P-459
Subject Reductant-free synthesis of carbon dots-supported Ag-Cu catalysts for electrocatalytic oxygen reduction reaction
Authors Hoseop Im, Sunguk Noh, Jun Ho Shim*
Department of Chemistry, Daegu University, Korea
Abstract Carbon dots (CDs, also referred to in some literature as carbon quantum dots) have emerged as an important class of active nanomaterials for a variety of purposes and applications. For the use of optical energy conversion and related fields, there has been extensive research on their electron transfer process and photoinduced charge separation. However, as an excellent electron acceptor and electron donor, carbon nanoparticles have promising potential to be an oxidizing or reducing agent, which have rarely been reported. In this presentation, carbon dots-supported silver-copper (Ag-Cu/CDs) was prepared by using CDs as reducing agent. The prepared Ag-Cu/CDs didn’t show any color change or aggregation for more than one month. This result indicated that the CDs were weak stabilizing agents to keep Ag-Cu nanoparticles from aggregation. To the best of our knowledge, the use of CDs as reducing and stabilizing agents has rarely been reported in conjunction with their use in the fabrication of metallic nanoparticles. The electrocatalytic activity of the Ag-Cu/CDs for oxygen reduction reaction in alkaline media was investigated by rotating disk electrode, rotating ring-disk electrode, and cyclic voltammetry. Indeed, the resultant Ag-Cu/CDs composites exhibited good catalytic activity for the reduction of oxygen, compared with the individual Ag (or Cu) nanoparticles synthesized by citrate reduction. The compositional/structural features are characterized by high-resolution transmission electron microscopy, Fourier transform infrared and UV-Vis spectroscopy, and X-ray diffraction. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1B03930895).
E-mail si4032@daegu.ac.kr