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-630
Subject Cascading alignment of multilayered F:SnO2/WO3/BiVO4 in Photoelectrochemical (PEC) Water Splitting
Authors Gun Yun, Soon Hyung Kang1,*
Department of Advanced Chemicals & Engineering, Chonnam National University, Korea
1Department of Chemical Education, Chonnam National University, Korea
Abstract Fluorine doped Tin dioxide (F:SnO2) inverse opals (IOs) having a pore size of approximately 300 nm in the 400 nm sized polystyrene bead (PS) templates were developed by a spin-coating-assisted sol-gel process. Upon this template, the F:SnO2/WO3 core-shell IOs were developed by the facile electrodeposition under a constant potential (-0.5 VAg/AgCl(sat.)). Furthermore, upon the F:SnO2/WO3 core-shell Ios, BiVO4 shell layers were covered by electrodeposition under a constant current (2 mA/cm2). The optimum photoelectrochemical (PEC) response was achieved with Co-Pi catalyst (F:SnO2/WO3/BiVO4/Co-Pi), which exhibited the highest photocurrent density (Jsc) more than 5 mA/cm2 (1.23 VRHE / 0.717 VAg/AgCl(sat.)) under full-sun conditions, compared with the values for the pure F:SnO2, F:SnO2/WO3 and F:SnO2/WO3/BiVO4 electrodes. In conclusion, considering that the favorable cascading band alignment can boost the fast charge separation and transport through the conductive F:SnO2 IO skeleton, we try to develop the multilayered F:SnO2/WO3/BiVO4 IOs structure showing the well-matched band alignment. And then, BiVO4 layer was adapted in the surface layer due to the more narrowing Eg of ~ 2.4 eV. Herein, the PEC performance and other results would be presented.
E-mail yungun7@naver.com