121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-595
Subject Bimetallic IrM (M: Ni, Co, Cr) oxide nanoparticles as an efficient and cost-effective electrocatalysts for oxygen evolution in neutral condition
Authors Jaekyung Yi, Hyung-Suk Oh*, Yun Jeong Hwang*
Clean Energy Research Center, Korea Institute of Science and Technology, Korea
Abstract A quick survey of the scientific literature reveals that many efforts have been devoted to the study of the oxygen evolution reaction (OER) with some inspirations from nature. OER, the production of O2 by the electrochemical oxidation of water (H2O), is a key component of many important energy conversion and storage systems that utilize water-splitting as well as CO2 reduction system. In particular, the OER has been regarded as a rate-limiting step in commercializing a water splitting system due to the sluggish kinetics associated with O–H bond breaking and attendant O–O bond formation. Hence, an efficient OER electrocatalysts is highly desired to address this challenge by efficiently coupling multiple protons and electron transfers for evolving O2 at a low overpotential. Currently, RuO2 and IrO2 are regarded as the most efficient OER electrocatalysts. However, these noble metal-based catalysts have obvious disadvantages for practical applications, including a low earth abundance and a high cost. To solve this issue, we synthesized the Ir based bimetallic electrocatalysts (IrM, M=Ni, Co, Cr) and measured the oxygen evolution reaction (OER) in neutral condition for CO2 reduction reaction. The morphological feature of synthesized electrocatalysts was studied using transmission electron microscopy (TEM). Furthermore, the electronic structure of electrocatalysts was also investigated using X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) to propose the role of bimetallic oxide on OER catalytic activity.
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