Ibrahim, Yusuf O. and Hezam, Abdo and Qahtan, T. F. and Al-Aswad, A. H. and Gondal, M. A. and Drmosh, Q. A. (2020) Laser-assisted synthesis of Z-scheme TiO2/rGO/g-C3N4 nanocomposites for highly enhanced photocatalytic hydrogen evolution. Applied Surface Science, 534. ISSN 1873-5584
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Constructing nanocomposite structures with favorable charge transfer routes is an effective way to obtain highly efficient photocatalysts. Herein, fabrication of indirect and noble metal-free Z-scheme photocatalytic architecture is demonstrated using pulsed laser ablation in liquids (PLAL) technique for the first time. The as-prepared ternary photocatalyst (denoted as TiO2/rGO/g-C3N4) comprises titanium dioxide (TiO2) nanotubes, reduced graphene oxide (rGO) nanosheets, and graphitic carbon nitride (g-C3N4) nanosheets. The photocatalytic activity of the as-synthesized composite is evaluated by monitoring water splitting. Various analytical techniques were employed to investigate the compositional, morphological, structural, and optical properties of the photocatalysts. The system of TiO2/rGO/g-C3N4 with the weight ratio of TiO2 to g-C3N4 of 2:4 and 1% rGO exhibited the highest hydrogen production rate of 32 +/- 1 mmol g(-1)h(-1), which is about 93, 3.8 and 2.6 times higher than those of pure g-C3N4, TiO2, and TiO2/rGO, respectively. This enhanced performance can be ascribed to the strong interfacial bonding (TiO2/rGO/g-C3N4), extended visible light absorption capacity due to higher photo-responsiveness of rGO and g-C3N4, the synergetic effect between TiO2 and g-C3N4 and direct contact between TiO2 and rGO which facilitated efficient separation and transfer of photogenerated charges. This study opens opportunities for the fabrications of different Z-scheme systems for various applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Z-scheme; Laser ablation; Nanocomposites; Water splitting; Photocatalyst |
| Subjects: | D Physical Science > Material Science |
| Divisions: | Department of > Material Science |
| Depositing User: | Mr Umendra uom |
| Date Deposited: | 03 Apr 2021 05:29 |
| Last Modified: | 03 Apr 2021 05:29 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/15453 |
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