120th General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code ELEC.P-482
Subject Electrocatalytic Oxygen Evolution Reaction on Electrospun Iridium-Cobalt Mixed Oxide Nanotubes
Authors AREUM YU, Chongmok Lee, Myung Hwa Kim1, Youngmi Lee*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
1Chemistry Department of Nano-Science, Ewha Womans University, Korea
Abstract Mixed oxide nanocomposites consisted of both Ir and Co (IrxCo1-xOy, 0 ≤ x ≤1) via electrospinning and calcination are prepared as high performance electrocatalysts for oxygen evolution reaction (OER). The efficiency of water splitting is limited by the significant overpotential of the OER, because OER which is kinetically slow anodic half reaction of water. The morphologies and compositions of the synthesized IrxCo1-xOy nanotubes are investigated with field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) and Raman spectroscopy show the change of the structure occurred with blending of two elements. Electrochemical activities of diverse IrxCo1-xOy nanotubes for OER are characterized with rotating disk electrode voltammetry in 1 M NaOH aqueous solution. Among various compositions of IrxCo1-xOy, Ir0.46Co0.54Oy nanotubes are examined to have the highest OER activity (the least positive onset potential, greatest current density and low Tafel slope) which is higher than commercial Ir/C. In addition, the Ir0.46Co0.54Oy nanotubes also possess a high stability during repetitive OER scans in alkaline electrolyte. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT& Future Planning (NRF-2017R1A2A2A14001137).
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