Preparation and Photocatalytic Hydrogen Production of Pt-Graphene/TiO2 Composites from Water Splitting
| Autor: | Shiao-Shing Chen, Dan-Dan Zheng, Nhat-Thien Nguyen, Chang-Tang Chang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Hydrogen Biomedical Engineering chemistry.chemical_element Bioengineering 02 engineering and technology General Chemistry 010501 environmental sciences engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Catalysis chemistry engineering Photocatalysis Water splitting General Materials Science Noble metal Composite material 0210 nano-technology Energy source Photocatalytic water splitting 0105 earth and related environmental sciences Hydrogen production |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 18:48-55 |
| ISSN: | 1533-4880 |
| Popis: | Hydrogen is considered as a promising energy source with its high energy yield, renewable, environment friendly properties. TiO2 modified with noble metal and nonmetal is widely used. In this study, Pt and graphene (GN) were used to modify TiO2 nanoparticles. GN/TiO2 (TG), Pt-TiO2 (PT), Pt-GN/TiO2 (PTG) was successfully synthesized by modified Hummers' method, alcohol thermal and photodeposition method, respectively. The characterizations of the synthesized catalysts by UV-vis/DRS, components analysis, XRD and TEM analysis were conducted. Results showed the maximum hydrogen production rate was approximately 4.71 mmol h-1 g-1 when the Pt content was 1.0 wt.%. Higher and lower than 1.0 wt.% of Pt loading content both result in low efficiency of hydrogen production. The situation of graphene is similar to Pt. The optimal ratio for grapheme is 10 wt.%. The highest hydrogen production rate is 6.58 mmol h-1 g-1 by 1.5 wt.% Pt-5 wt.% GN/TiO2 (1.5PTG5), which is about 1.4 and 2.2 times higher than that of Pt-TiO2 and GN/TiO2 binary composites, respectively. The utilization of low-cost graphene can reduce the use of noble metal Pt in photocatalytic hydrogen production. The mechanism of Pt-GN/TiO2 for the improved photocatalytic activity is proposed. 0.1 g L-1 is found to be the optimum catalyst concentration for optimal hydrogen production. |
| Databáze: | OpenAIRE |
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