Ultra-fast green synthesis of a defective TiO<inf>2</inf> photocatalyst towards hydrogen production
Issued Date
2024-08-02
Resource Type
eISSN
20462069
Scopus ID
2-s2.0-85200703833
Journal Title
RSC Advances
Volume
14
Issue
33
Start Page
24213
End Page
24225
Rights Holder(s)
SCOPUS
Bibliographic Citation
RSC Advances Vol.14 No.33 (2024) , 24213-24225
Suggested Citation
Kunthakudee N., Puangpetch T., Ramakul P., Serivalsatit K., Ponchio C., Hunsom M. Ultra-fast green synthesis of a defective TiO<inf>2</inf> photocatalyst towards hydrogen production. RSC Advances Vol.14 No.33 (2024) , 24213-24225. 24225. doi:10.1039/d4ra04284k Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/100477
Title
Ultra-fast green synthesis of a defective TiO<inf>2</inf> photocatalyst towards hydrogen production
Corresponding Author(s)
Other Contributor(s)
Abstract
An ultra-fast green synthesis of defective titanium dioxide (TiO2) photocatalysts was conducted by the microwave-assisted method using l-ascorbic acid (l-As) as a reducing agent. Effect of l-As concentrations on the chemical-, optical- and photoelectrochemical properties as well as the photocatalytic performance towards the hydrogen (H2) production was explored. The obtained TiO2 nanoparticles (NPs) illustrated the brown fine powders with different brownness levels depending on the concentrations of l-As. A high l-As concentration provided a high brownness of TiO2 NPs with a high generation of Ti3+ defects and oxygen vacancies (Ov), which can extend the light absorption towards the visible and near-infrared regions, suppress the recombination rate of electron-hole pairs, promote the photocurrent response and minimize the interface charge transfer resistance. An appropriate quantity of generated defects and good porous properties played a crucial role in photocatalytic H2 production. Under fluorescence illumination, the sample synthesized with a TiO2 and l-As weight ratio of 1 : 0.25 (PAs0.25) exhibited the highest H2 production rate (∼162 μmol g−1 h−1 in the presence of 1 wt% Au co-catalyst) with a slight drop (∼8.2%) after the 5th use (15 h). The synthesis method proposed in this work provides a new insight to an ultra-fast synthesis of defective TiO2 NPs using an eco-friendly chemical precursor under non-severe conditions.