119th General Meeting of the KCS

Type Symposium
Area Photocatalytic Water Oxidation and Carbon Dioxide Reduction Ⅱ
Room No. 408호
Time THU 14:00-:
Code IND2-2
Subject WO3 based photoelectrochemical solar water splitting
Authors 박종혁
연세대학교 화공생명공학과, Korea
Abstract Tungsten Oxide is a good candidate as photoanode for photoelectrochemcial water splitting. According to the natural properties like band gap value, conductivity and surface chemical state, modifications should be conducted for WO3 to improve the PEC performance. First, we designed 3D inverse opal structure for WO3 and combined that with BiVO4 for heterojunction structure, resulting dramatic improvement of PEC performance. Second, surface modification with overlayer was employed to improve the water oxidation property of WO3. A WO3 overlayer with dual vacancies prepared by using a solution-based reducing agent, Li-EDA (lithium dissolved in ethylenediamine), which improved the PEC performance of the mesoporous WO3 photoanode dramatically. In comparison to the pristine samples, the interconnected WO3 nanoparticles surrounded by a 2-2.5 nm-thick overlayer exhibited a photocurrent density approximately 2.4 times higher and a markedly cathodic shift of the onset potential, which is mainly attributed to the facilitative effect on interface charge transfer and the improved conductivity by enhanced charge carrier density. This simple and effective strategy may provide a new path to improve the PEC performance of other photoanodes.
E-mail lutts@yonsei.ac.kr