KSCN-induced Interfacial Dipole in Black TiO2 for Enhanced Photocatalytic CO2 Reduction

Fang Yu Fu, Indrajit Shown, Chia Shuo Li, Putikam Raghunath, Tsai Yu Lin, Tadesse Billo, Heng Liang Wu, Chih I. Wu, Po Wen Chung, Ming-Chang Lin, Li Chyong Chen*, Kuei Hsien Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)25186-25194
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number28
DOIs
StatePublished - 17 Jul 2019

Keywords

  • artificial photosynthesis
  • black TiO
  • CO reduction
  • interfacial dipole
  • photocatalyst
  • solar fuel

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    Fu, F. Y., Shown, I., Li, C. S., Raghunath, P., Lin, T. Y., Billo, T., Wu, H. L., Wu, C. I., Chung, P. W., Lin, M-C., Chen, L. C., & Chen, K. H. (2019). KSCN-induced Interfacial Dipole in Black TiO2 for Enhanced Photocatalytic CO2 Reduction. ACS Applied Materials and Interfaces, 11(28), 25186-25194. https://doi.org/10.1021/acsami.9b06264