Metal-organic framework derived Co3O4/TiO2 heterostructure nanoarrays for promote photoelectrochemical water splitting. (16th July 2021)

• Record Type: Journal Article
• Authors: Ding, Qijia; Gou, Lantong; Wei, Danrui; Xu, Dongbo; Fan, Weiqiang; Shi, Weidong
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 49(2021)
• Page Start: 24965
• Page End: 24976
• Publication Date: 2021-07-16
• Subjects: Co-MOF -- Co3O4/TiO2 -- Electrostatic adsorption -- Photoelectrochemical -- Water splitting; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.05.065
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, we proposed a simple and new method to fabricate Metal-organic frameworks (MOFs) derived Co3 O4 modified TiO2 nanorods (NRs) photoelectrode by immersion and anneal treatment. The positively charged Co-MOF (ZIF-67) was adsorbed on the negatively charged TiO2 NRs by electrostatic interaction, and then annealed in air to obtain the Co3 O4 /TiO2 photoelectrodes. The photoelectrochemical (PEC) performance of the Co3 O4 /TiO2 photoelectrodes has been significantly improved compared with the pure TiO2, the best photocurrent density of Co3 O4 /TiO2 photoelectrode could reach 1.04 mA/cm 2 (1.23 V vs RHE) which was almost 1.65 times than that of pure TiO2 . On the Co3 O4 /TiO2 photoelectrodes, the significant improvement in PEC performance could be attributed to the constructed p-n heterostructure, which can promote charge transfer within the system and improve the efficiency of electron/hole separation. Meanwhile, under the action of the MOFs-derived Co3 O4, the number of active sites increases significantly and visibly improve the photoresponse performance. Highlights: Co-MOF (ZIF-67) was located on the surface of TiO2 nanorods (NRs) through electrostatic attraction. Using Co-MOF (ZIF-67) as the precursor, the Co3 O4 /TiO2 photoelectrodes were obtained by calcination. The Co3 O4 /TiO2 binary heterostructure shows high-efficiency PEC performance. This method can be widely applied to other semiconductor photoelectrodes.