A Visible Light-Responsive TiO2 Photocathode Achieved by a Rh Dopant

• DOI: 10.1021/acs.jpclett.4c00910
• Publication Date: 2024-06-05T14:10:00Z
• Authors: Yecheng Tang; Kaiwei Liu; Jiaming Zhang; Jiaming Wang; Haifeng Wang; Meng Liu; Jifang Zhang; Guijun Ma
• Keywords: Photocathode; Visible spectrum

Developing an efficient and stable photocathode material for photoelectrochemical solar water splitting remains challenging. Herein, we demonstrate the potential of rutile TiO2 as a by Rh doping with visible light absorption up to 640 nm onset 0.9 V versus reversible hydrogen electrode. The dopant transforms host from n-type semiconductor p-type one, confirmed Mott–Schottky curve kelvin probe force microscopy. Physical analyses further suggest that mechanism is dependent on concentration. Lower levels dopants generate localized Rh3+, while higher favor Rh4+ interacts more strongly O 2p orbitals. latter found not only extend range but also facilitate charge transport. This work elucidates role in adjusting behavior TiO2, it provides promising energy conversion.