123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Scholars in Electrochemistry
Room No. Room 407+408
Time THU 09:30-09:40
Code ELEC.O-4
Subject The electronic structure of IrNiOx electrocatalysts for oxygen evolution reaction in different pH electrolytic condition
Authors Jaekyung Yi, Hyung-Suk Oh1,*, Yun Jeong Hwang1,*
Division of Energy & Environment Technology, University of Science & Technology, Korea
1Clean Energy Research Center, Korea Institute of Science and Technology, Korea
Abstract Clean energy is attracting much attention as an alternative energy source because the energy supply and demand paradigm based on fossil fuels cause environmental pollution. In this respect, the hydrogen energy produced by the electrochemical water splitting has many advantages, such as high energy density, no self-discharge, no pollutants and so on. The water splitting consists of two electrochemical reactions: hydrogen evolution reaction (HER) in the cathode side and oxygen evolution reaction (OER) in the anode side. Most studies are focused on the oxygen electrode with high overpotential and this issue are addressed by controlling the electronic structure of the electrocatalysts. In general, the electronic structure of the electrocatalyst for OER can be interpreted with the coordination between d-orbitals (t_2g and e_g) of transition metal and oxygen. The issue of OER catalyst research is to change the electronic structure considering the electron occupancy and the density of state (DOS) of d-orbital in electrocatalysts, thereby reducing the overpotential and increasing the activity for OER. Herein, we synthesized IrNiOx/C electrocatalyst for OER, which was improved OER activity by varying the pH electrolytic condition during the activation process. In order to prove the reason for the improved activity, we analyzed the electronic structure of IrNiOx/C with different pH condition using in-situ XAFS. The physical properties were also analyzed using IL-TEM, XPS, XRD, and ICP-OES.
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