Presentation Information
[23a-12L-9]Optimizing Onset Potential in Mo:BiVO4/TiO2 Heterojunctions through Oxygen Partial Pressure Modulation for Enhanced Photoelectrochemical Water Splitting
〇(DC)Lingga Ghufira Oktariza1, Yuta Sato1, Kenichi Ozawa2, Muhammad Monirul Islam1, Shigeru Ikeda3, Takeaki Sakurai1 (1.University of Tsukuba, 2.High Energy Accelerator Research Organization (KEK), 3.Konan University)
Keywords:
Onset Potential,Heterojunction,Oxygen Partial Pressure
Bismuth vanadate (BiVO4) is a promising photoanode for visible light absorption in photoelectrochemical (PEC) systems. Incorporating molybdenum (Mo) improves its electronic structure, but high onset potential remains an issue. This study explores a BiVO4 and titanium dioxide (TiO2) heterojunction to optimize charge separation and reduce the onset potential for PEC water splitting. TiO2, known for electron mobility, is deposited on conductive glass under varying oxygen partial pressures. Resonant X-ray photoelectron spectroscopy reveals the impact on the valence band. Varying oxygen pressures influence TiO2 defects, altering the valence band. The heterojunction exhibits improved photocurrent density and reduced onset potential, showcasing the engineered electronic structure's effectiveness.