Enhanced photoelectrochemical hydrogen production by a composite photoanode constructed with TiO2 nanorods and Cu-modified NH2-MIL-125. (5th May 2023)

• Record Type: Journal Article
• Authors: Sang, Lixia; Liu, Xiaohang; Wang, Xudong; Lei, Lei; Cao, Angran
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 39(2023)
• Page Start: 14697
• Page End: 14706
• Publication Date: 2023-05-05
• Subjects: Hydrogen production -- Photoelectrode -- TiO2 nanorods -- Cu-NH2-MIL-125; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.12.352
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: It is of great interest to enhance the photoelectrochemical hydrogen production rate of TiO2 by utilizing the new Metal-organic frameworks material such as NH2 -MIL-125(Ti), but the assembly method and its details often bring about a significant difference in performances of the composite photoelectrode. In this study, NH2 -MIL-125 is grown on the surface of TiO2 nanorods by an in-situ strategy, and then Cu-modified NH2 -MIL-125/TiO2 photoanode is prepared by impregnation method. Based on the characterization of SEM, UV-VIS DRS and PL spectra, the disc-like NH2 -MIL-125 can improve the light absorptance in visible light region, and the modification of Cu + /Cu 2+ can inhibit the charge recombination in NH2 -MIL-125/TiO2 photoanode, resulting in the improved the carrier transport ability verified by EIS and IMPS. Under AM 1.5 illumination, H2 evolution rate over Cu-NH2 -MIL-125/TiO2 is boosted a great extent, which is 4.6 times than that of pristine TiO2 . Highlights: Cu-NH2 -MIL-125/TiO2 is prepared by in-situ strategy and impregnating method. H2 evolution rate over Cu-NH2 -MIL-125/TiO2 is boosted greatly. The disc-like NH2 -MIL-125 on TiO2 shows the improved visible light absorption. Cu + /Cu 2+ can inhibit the charge recombination in NH2 -MIL-125/TiO2 photoanode.