In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 50, No. 42 ( 2021), p. 15422-15432
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/TiO 2 (GY/TiO 2 ) p–n heterojunction in which p-type γ-graphyne nanosheets were distributed in the three-dimensional space surrounding TiO 2 nanotube arrays. The GY/TiO 2 photoanode achieves a photocurrent density of 0.75 mA cm −2 at 1.23 V ( vs. RHE), 1.7 times that of bare TiO 2 , and extends the electron lifetime of TiO 2 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.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1472887-4
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