Engineering stable Pt nanoparticles and oxygen vacancies on defective TiO2 via introducing strong electronic metal-support interaction for efficient CO2 photoreduction

Liang Yi Lin, Shalinee Kavadiya, Xiang He, Wei Ning Wang, Bedia Begum Karakocak, Yu Chih Lin, Mikhail Y. Berezin, Pratim Biswas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This work for the first time reports the promoting effect of strong electronic metal-support interaction (EMSI) in Pt/TiO2-VO (VO: oxygen vacancy) for gas-phase CO2 photoreduction. A novel in-situ surface hydrogenation was developed to prepare hydrogenated Pt/TiO2-VO in a continuous, high throughput diffusion flame aerosol reactor. The combined results of various characterization techniques confirmed the presence of EMSI between Pt and defective TiO2-VO resulted in the enhanced electronic density of Pt nanoparticles. Both the modulated electronic structure of Pt and surface oxygen vacancies simultaneously promoted the activation of surface adsorbed carbon intermediates and facilitated the separation of photogenerated charges, eventually boosting the photocatalytic activity of Pt/TiO2-VO. The optimized Pt/TiO2-VO demonstrated a high quantum yield of 1.49% with high CH4 selectivity (81%), which rendered 5.8- and 1.2-fold enhancements over its counterparts of TiO2-VO and Pt/TiO2. More significantly, the EMSI also played a critical role in preserving the surface metallic Pt0 and oxygen vacancies, and in sustaining high activity of the Pt/TiO2-VO, whereas rapid catalytic deactivation are observed for both TiO2-VO and Pt/TiO2.

Original languageEnglish
Article number123450
JournalChemical Engineering Journal
DOIs
StatePublished - 1 Jan 2020

Keywords

  • CO reduction
  • Flame synthesis
  • Hydrogenation
  • Pt/TiO
  • Strong electronic metal-support interaction

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