|Title:||KSCN-induced Interfacial Dipole in Black TiO<inf>2</inf> for Enhanced Photocatalytic CO<inf>2</inf> Reduction||Authors:||TSAI-YU LIN
Lin, Ming Chang
Chung, Po Wen
Li, Chia Shuo
Fu, Fang Yu
Chen, Kuei Hsien
|Keywords:||artificial photosynthesis | black TiO 2 | CO reduction 2 | interfacial dipole | photocatalyst | solar fuel||Issue Date:||24-Jun-2019||Journal Volume:||11||Journal Issue:||28||Source:||ACS Applied Materials and Interfaces||Abstract:||
© 2019 American Chemical Society. 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 nanocluster-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.
|Appears in Collections:||凝態科學研究中心|
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