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-Jul-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
Appears in Collections:Articles