標題: | KSCN-induced Interfacial Dipole in Black TiO2 for Enhanced Photocatalytic CO2 Reduction |
作者: | Fu, Fang-Yu Shown, Indrajit Li, Chia-Shuo Raghunath, Putikam Lin, Tsai-Yu Billo, Tadesse Wu, Heng-Liang Wu, Chih-I Chung, Po-Wen Lin, Ming-Chang Chen, Li-Chyong Chen, Kuei-Hsien 應用化學系 Department of Applied Chemistry |
關鍵字: | artificial photosynthesis;photocatalyst;CO2 reduction;black TiO2;interfacial dipole;solar fuel |
公開日期: | 17-七月-2019 |
摘要: | Tuning the electronic band structure of black titania to improve photocatalytic performance through conventional band engineering methods has been challenging because of the defect-induced charge carrier and trapping sites. In this study, KSCN-modified hydrogenated nickel nano cluster-modified black TiO2 (SCN-H-Ni-TiO2) exhibits enhanced photocatalytic CO2 reduction due to the interfacial dipole effect. Upon combining the experimental and theoretical simulation approach, the presence of an electrostatic interfacial dipole associated with chemisorption of SCN has dramatic effects on the photocatalyst band structure in SCN H-Ni-TiO2. An interfacial dipole possesses a more negative zeta potential shift of the isoelectric point from 5.20 to 3.20, which will accelerate the charge carrier separation and electron transfer process. Thiocyanate ion passivation on black TiO2 demonstrated an increased work function around 0.60 eV, which was induced by the interracial dipole effect. Overall, the SCN H-Ni-TiO2 photocatalyst showed an enhanced CO2 reduction to solar fuel yield by 2.80 times higher than H-Ni-TiO2 and retained around 88% product formation yield after 40 h. |
URI: | http://dx.doi.org/10.1021/acsami.9b06264 http://hdl.handle.net/11536/152650 |
ISSN: | 1944-8244 |
DOI: | 10.1021/acsami.9b06264 |
期刊: | ACS APPLIED MATERIALS & INTERFACES |
Volume: | 11 |
Issue: | 28 |
起始頁: | 25186 |
結束頁: | 25194 |
顯示於類別: | 期刊論文 |