2D/2D heterojunction of Ti3 C2 /g-C3 N4 nanosheets for enhanced photocatalytic hydrogen evolution

Nanoscale
Tongming SuZili Wu

Abstract

Photocatalytic hydrogen evolution from water has received enormous attention due to its ability to address a number of global environmental and energy-related issues. Here, we synthesize 2D/2D Ti3C2/g-C3N4 composites by electrostatic self-assembly technique and demonstrate their use as photocatalysts for hydrogen evolution under visible light irradiation. The optimized Ti3C2/g-C3N4 composite exhibited a 10 times higher photocatalytic hydrogen evolution performance (72.3 μmol h-1 gcat-1) than that of pristine g-C3N4 (7.1 μmol h-1 gcat-1). Such enhanced photocatalytic performance was due to the formation of 2D/2D heterojunctions in the Ti3C2/g-C3N4 composites. The intimate contact between the monolayer Ti3C2 and g-C3N4 nanosheets promotes the separation of photogenerated charge carriers at the Ti3C2/g-C3N4 interface. Furthermore, the ultrahigh conductivity of Ti3C2 and the Schottky junction formed between g-C3N4/MXene interfaces facilitate the photoinduced electron transfer and suppress the recombination with photogenerated holes. This work demonstrates that the 2D/2D Ti3C2/g-C3N4 composites are promising photocatalysts thanks to the ultrathin MXenes as efficient co-catalysts for photocatalytic hydrogen production.

References

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Citations

Aug 31, 2019·Nanotechnology·Tongming SuZili Wu
Jun 5, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Titas Kumar Mukhopadhyay, Ayan Datta
Dec 29, 2020·Journal of Colloid and Interface Science·Yuwei LiaoYaorong Su
Feb 24, 2021·Chemical Society Reviews·Sharafadeen GbadamasiNasir Mahmood
Sep 21, 2019·Nano-micro Letters·Yuliang SunXiao-Feng Wang
Aug 1, 2021·Advances in Colloid and Interface Science·Mengxi TanYang Bai
Oct 17, 2019·ACS Applied Materials & Interfaces·Yujie LiJian Tian

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Methods Mentioned

BETA
X-ray
transmission electron microscopy
AFM

Software Mentioned

Avantage Data System

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