121st General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ENVR.P-674
Subject Tungsten oxide defect engineering for water-oxidation and electrical oxygen reduction reaction
Authors Bupmo Kim, Wooyul Kim1,*, Wonyong Chou2,*
Department of Chemical Engineering, Pohang University of Science and Technology, Korea
1Department of Chemical and Biological Engineering, Sookmyung Women’s University, Korea
2Division of Environmental Engineering, Pohang University of Science and Technology, Korea
Abstract Tungsten oxide with oxygen deficiency has been extensively studied due to its superior photoactivity. Oxide defect engineering enable to couple solar energy to oxygen activation. In particular nonstoichiometric tungsten oxide (e.g., W18O49) also allow near-infrared (NIR) absorption through plasmonic effect, broadening the overall light usability of the material. Although the involvement of oxygen vacancies in the photocatalytic process is widely accepted, the nature of the reaction mechanism is complex and not clearly understood because it is difficult directly monitor oxygen vacancies which is not stable. Herein, we carefully tuned oxygen vacancy of tungsten oxide form W to WO3 via WO2 using high temperature anodization method. Through the potassium contained non-aqueous anodization process, few amount of potassium can stabilize to oxygen vacancies in tungsten oxides. Various application of precise tuned tungsten oxide (e.g., both water oxidation and reduction process, oxygen reduction, etc) will be presented.
E-mail bupmokim@postech.ac.kr