Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 28, Pages 11287-11292Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202002136
Keywords
MXene; photocatalytic H-2 evolution; photoexcited charge separation; two-dimensional heterostructures; ZnIn2S4 nanosheets
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Funding
- Singapore National Research Foundation [NRF-NRFI2018-03]
- Chinese Scholarship Council
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Photocatalysts derived from semiconductor heterojunctions that harvest solar energy and catalyze reactions still suffer from low solar-to-hydrogen conversion efficiency. Now, MXene (Ti3C2TX) nanosheets (MNs) are used to support the in situ growth of ultrathin ZnIn2S4 nanosheets (UZNs), producing sandwich-like hierarchical heterostructures (UZNs-MNs-UZNs) for efficient photocatalytic H-2 evolution. Opportune lateral epitaxy of UZNs on the surface of MNs improves specific surface area, pore diameter, and hydrophilicity of the resulting materials, all of which could be beneficial to the photocatalytic activity. Owing to the Schottky junction and ultrathin 2D structures of UZNs and MNs, the heterostructures could effectively suppress photoexcited electron-hole recombination and boost photoexcited charge transfer and separation. The heterostructure photocatalyst exhibits improved photocatalytic H-2 evolution performance (6.6 times higher than pristine ZnIn2S4) and excellent stability.
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