Journal
NANOSCALE
Volume 11, Issue 17, Pages 8138-8149Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr00168a
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Funding
- Center for Nanophase Materials Sciences, DOE Office of Science User Facility
- China Scholarship Council
- National Science Foundation [DGE-1650044, 1511818]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1511818] Funding Source: National Science Foundation
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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 mu mol h(-1) g(cat)(-1)) than that of pristine g-C3N4 (7.1 mu mol h(-1) g(cat)(-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.
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