Details
| Original language | English |
|---|---|
| Article number | 1424 |
| Number of pages | 12 |
| Journal | CATALYSTS |
| Volume | 11 |
| Issue number | 12 |
| Early online date | 23 Nov 2021 |
| Publication status | Published - Dec 2021 |
Abstract
Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2 /BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoat-ings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2 /BiVO4 heterostructures correspond to type I and type II het-erostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2 /BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion.
Keywords
- Charge separation, Charge transfer, Heterojunctions, Heterostructures, Metal oxide surfaces, Photostimulated hydrophilicity, Surface energy, Work function
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: CATALYSTS, Vol. 11, No. 12, 1424, 12.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of the Type of Heterostructures on Photostimulated Alteration of the Surface Hydrophilicity
T2 - TiO2 /BiVO4 vs. ZnO/BiVO4 Planar Heterostructured Coatings
AU - Maevskaya, Maria V.
AU - Rudakova, Aida V.
AU - Koroleva, Alexandra V.
AU - Sakhatskii, Aleksandr S.
AU - Emeline, Alexei V.
AU - Bahnemann, Detlef W.
N1 - Funding Information: Funding: The reported study was funded by RFBR, project number 19-32-90111.
PY - 2021/12
Y1 - 2021/12
N2 - Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2 /BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoat-ings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2 /BiVO4 heterostructures correspond to type I and type II het-erostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2 /BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion.
AB - Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2 /BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoat-ings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2 /BiVO4 heterostructures correspond to type I and type II het-erostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2 /BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion.
KW - Charge separation
KW - Charge transfer
KW - Heterojunctions
KW - Heterostructures
KW - Metal oxide surfaces
KW - Photostimulated hydrophilicity
KW - Surface energy
KW - Work function
UR - http://www.scopus.com/inward/record.url?scp=85119599871&partnerID=8YFLogxK
U2 - 10.3390/catal11121424
DO - 10.3390/catal11121424
M3 - Article
AN - SCOPUS:85119599871
VL - 11
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 12
M1 - 1424
ER -