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Published on: February 11, 2016
Preparation of Pt cluster-modified CdS nanorod via galvanic replacement reaction for photocatalytic hydrogen
Jiaqi Wang1,2, Jinhua Xiong1,2, Zimo Chen1
1Fujian Provincial Key Laboratory of Clean Energy Materials, Longyan University, Longyan 364000, People's Republic of China.
Abstract:
A novel galvanic replacement reaction (GR) method was developed for preparing Pt cluster-modified CdS nanorod (NR) photocatalysts with enhanced hydrogen evolution performance. The as-prepared CdS NR synthesized via a hydrothermal method was calcined to create an oxide surface layer, which was induced to generate Cd0by photogenerated electrons. GR was completed by the reduction of Pt precursors into Pt clusters by Cd0, achieving a targeted deposition of Pt on the active sites of CdS. Structural and spectroscopic characterizations (x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy, Raman, and UV-vis) confirmed the formation of highly dispersed Pt clusters on CdS NR. The optimal photocatalyst (CdS/2%Pt-GR) was achieved using PtCl4as the precursor with a 2 wt% loading. CdS/2%Pt-GR exhibited a hydrogen evolution rate of 237.7μmol h-1in the lactic acid solution, 2.6, 13.3, and 7.1 times that of CdS-NR-air-2%Pt-CR, CdS-NR-air-2%Pt-PD, and CdS-NR-2%Pt-PD, respectively. Moreover, CdS/2%Pt-GR possessed an excellent photocatalytic stability.
