Journal
APPLIED SURFACE SCIENCE
Volume 573, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151491
Keywords
Nb2CTX; MXene; CdS; Schottky heterojunction; Photocatalytic hydrogen production
Categories
Funding
- National Natural Science Foundation of China [51902137, 51672113]
- Key Research and Development Plan of Jiangsu Province [BE2019094]
- Six Talent Peaks Project of Jiangsu Province [TD-XCL-004]
- Qing Lan Project of Jiangsu Province of China [[2016]15]
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A one-step solvothermal method was used to grow CdS nanorods on Nb2CTX, forming a 1D/2D Schottky heterojunction to enhance photocatalytic activity. The CdS/Nb2CTX composite showed significantly improved hydrogen production rate under visible light compared to pristine CdS.
Constructing heterojunction photocatalyst with a suitable band energy structure and well-defined interfacial contact is considered to be an effective way for solar-to-hydrogen conversion. CdS with suitable band structure is expected to be an excellent candidate in photocatalytic water splitting to produce hydrogen, but fast recombination of photo-generated carries usually hinders its applications. Nb2CTX, with lower Fermi energy level than Ti3C2TX, has been used as co-catalyst for photocatalysis due to its excellent electroconductivity and hydrophilicity. In this work, a one-step solvothermal method is used to grow in-situ one-dimensional (1D) CdS nanorods on two-dimensional (2D) Nb2CTX under the action of electrostatically driven self-assembly, ensuring the intimate contact at the CdS/Nb2CTX interface to form the 1D/2D Schottky heterojunction. Correspondingly, the CdS/Nb2CTX composite helps to accelerate the separation of electron-hole and charge transfer of CdS, and thus improving its photocatalytic performance. The optimized CdS/Nb2CTX composite (CdS/Nb2CTX-60) presents enhanced photocatalytic activity with hydrogen production rate of 5.3 mmol.g(-1).h(-1) under visible light, which is 1.7 times higher than that of pristine CdS.
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