Assembling γ-graphyne surrounding TiO2 nanotube arrays: an efficient p–n heterojunction for boosting photoelectrochemical water splitting. Issue 42 (18th October 2021)

• Record Type: Journal Article
• Authors: Qiu, Dong; He, Chengli; Lu, Yuxuan; Li, Qiaodan; Chen, Yang; Cui, Xiaoli
• Is Part Of: Dalton transactions. Volume 50:Issue 42(2021)
• Page Start: 15422
• Page End: 15432
• Publication Date: 2021-10-18
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt01810h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : γ-Graphyne was adequately integrated into TiO2 nanotube arrays to produce a p–n heterojunction with a compatible energy band, which enhances visible light harvesting and promotes charge separation for boosting photoelectrochemical water splitting. Abstract : Photoelectrochemical water splitting is an excellent strategy for hydrogen generation and it is pivotal to the development of photoanodes with sufficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In this work, we rationally constructed a γ-graphyne/TiO2 (GY/TiO2 ) p–n heterojunction in which p-type γ-graphyne nanosheets were distributed in the three-dimensional space surrounding TiO2 nanotube arrays. The GY/TiO2 photoanode achieves a photocurrent density of 0.75 mA cm −2 at 1.23 V ( vs. RHE), 1.7 times that of bare TiO2, and extends the electron lifetime of TiO2 from 0.51 to 1.16 ms. The improvement arises from moderate γ-graphyne modification, contributing to broadened light absorption, the suppressed recombination of electron–hole pairs, an increase in charge transfer, and a higher injection efficiency of surface electrons. This work provides a reliable approach for the utilization and conversion of sustainable solar energy.