標題: | Engineering stable Pt nanoparticles and oxygen vacancies on defective TiO2 via introducing strong electronic metal-support interaction for efficient CO2 photoreduction |
作者: | Lin, Liang-Yi Kavadiya, Shalinee He, Xiang Wang, Wei-Ning Karakocak, Bedia Begum Lin, Yu-Chih Berezin, Mikhail Y. Biswas, Pratim 環境工程研究所 Institute of Environmental Engineering |
關鍵字: | CO2 reduction;Flame synthesis;Hydrogenation;Pt/TiO2;Strong electronic metal-support interaction |
公開日期: | 1-Jun-2020 |
摘要: | This work for the first time reports the promoting effect of strong electronic metal-support interaction (EMSI) in N/TiO2-V-O (V-O: oxygen vacancy) for gas-phase CO2 photoreduction. A novel in-situ surface hydrogenation was developed to prepare hydrogenated N/TiO2-V-O in a continuous, high throughput diffusion flame aerosol reactor. The combined results of various characterization techniques confirmed the presence of EMSI between N and defective TiO2-V-O resulted in the enhanced electronic density of N nanoparticles. Both the modulated electronic structure of N 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 N/TiO2-V-O. The optimized N/TiO2-V-O 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-V-O and N/TiO2. More significantly, the EMSI also played a critical role in preserving the surface metallic Pt-0 and oxygen vacancies, and in sustaining high activity of the Pt/TiO2-V-O, whereas rapid catalytic deactivation are observed for both TiO2-V-O and Pt/TiO2. |
URI: | http://dx.doi.org/10.1016/j.cej.2019.123450 http://hdl.handle.net/11536/154106 |
ISSN: | 1385-8947 |
DOI: | 10.1016/j.cej.2019.123450 |
期刊: | CHEMICAL ENGINEERING JOURNAL |
Volume: | 389 |
起始頁: | 0 |
結束頁: | 0 |
Appears in Collections: | Articles |