Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 817-823 |
| Seitenumfang | 7 |
| Fachzeitschrift | Topics in catalysis |
| Jahrgang | 64 |
| Ausgabenummer | 13-16 |
| Frühes Online-Datum | 12 Juni 2020 |
| Publikationsstatus | Veröffentlicht - Nov. 2021 |
Abstract
Series of Sc/V co-doped rutile TiO 2 with different Sc/V ratio was synthesized. Samples were characterized by XRD, SEM, XPS, BET, EPR, diffuse reflectance spectroscopy and Kelvin probe methods. EPR spectroscopy reveals a simultaneous increase of V 4+ and Ti 3+ as vanadium content grows. At the same time, an increase of vanadium concentration in co-doped samples results in stronger absorption in visible light range. However, a photocatalytic activity dependence on the co-dopant ratio demonstrates “volcano” plot behavior with maximum at 75/25 Sc/V ratio, while the work function dependence on Sc/V ratio demonstrates a negative correlation with photocatalytic activity resulting in a minimal value of work function at the same optimal ratio of co-dopant content. The analysis of the experimental results infers that alteration of Sc/V co-doping ratio leads to redistribution between shallow traps, which are not effective in charge carrier recombination, and deep traps, which act as effective recombination centers, with maximal shallow traps concentration corresponding to the optimal Sc/V ratio equal to 75/25, yielding the lowest recombination efficiency and therefore, the highest photocatalytic activity. Redistribution of defect states induced by co-doping should be distinguished as a primary factor of alteration of photocatalytic activity in co-doped TiO 2. Presented results demonstrate that photoactivity of co-doped titania cannot be considered as result of either independent action of dopants or their additive effect.
ASJC Scopus Sachgebiete
- Chemische Verfahrenstechnik (insg.)
- Katalyse
- Chemie (insg.)
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in: Topics in catalysis, Jahrgang 64, Nr. 13-16, 11.2021, S. 817-823.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Effect of Sc3+/V5+ Co-Doping on Photocatalytic Activity of TiO2
AU - Murzin, P.D.
AU - Murashkina, A.A.
AU - Emeline, A.V.
AU - Bahnemann, D.W.
N1 - Funding Information: This research was supported by Russian Foundation for Basic Research (RFBR) via a research grant N18–29–23035_mk and by Saint-Petersburg State University via a research project (Pure ID 51124539). Acknowledgements
PY - 2021/11
Y1 - 2021/11
N2 - Series of Sc/V co-doped rutile TiO 2 with different Sc/V ratio was synthesized. Samples were characterized by XRD, SEM, XPS, BET, EPR, diffuse reflectance spectroscopy and Kelvin probe methods. EPR spectroscopy reveals a simultaneous increase of V 4+ and Ti 3+ as vanadium content grows. At the same time, an increase of vanadium concentration in co-doped samples results in stronger absorption in visible light range. However, a photocatalytic activity dependence on the co-dopant ratio demonstrates “volcano” plot behavior with maximum at 75/25 Sc/V ratio, while the work function dependence on Sc/V ratio demonstrates a negative correlation with photocatalytic activity resulting in a minimal value of work function at the same optimal ratio of co-dopant content. The analysis of the experimental results infers that alteration of Sc/V co-doping ratio leads to redistribution between shallow traps, which are not effective in charge carrier recombination, and deep traps, which act as effective recombination centers, with maximal shallow traps concentration corresponding to the optimal Sc/V ratio equal to 75/25, yielding the lowest recombination efficiency and therefore, the highest photocatalytic activity. Redistribution of defect states induced by co-doping should be distinguished as a primary factor of alteration of photocatalytic activity in co-doped TiO 2. Presented results demonstrate that photoactivity of co-doped titania cannot be considered as result of either independent action of dopants or their additive effect.
AB - Series of Sc/V co-doped rutile TiO 2 with different Sc/V ratio was synthesized. Samples were characterized by XRD, SEM, XPS, BET, EPR, diffuse reflectance spectroscopy and Kelvin probe methods. EPR spectroscopy reveals a simultaneous increase of V 4+ and Ti 3+ as vanadium content grows. At the same time, an increase of vanadium concentration in co-doped samples results in stronger absorption in visible light range. However, a photocatalytic activity dependence on the co-dopant ratio demonstrates “volcano” plot behavior with maximum at 75/25 Sc/V ratio, while the work function dependence on Sc/V ratio demonstrates a negative correlation with photocatalytic activity resulting in a minimal value of work function at the same optimal ratio of co-dopant content. The analysis of the experimental results infers that alteration of Sc/V co-doping ratio leads to redistribution between shallow traps, which are not effective in charge carrier recombination, and deep traps, which act as effective recombination centers, with maximal shallow traps concentration corresponding to the optimal Sc/V ratio equal to 75/25, yielding the lowest recombination efficiency and therefore, the highest photocatalytic activity. Redistribution of defect states induced by co-doping should be distinguished as a primary factor of alteration of photocatalytic activity in co-doped TiO 2. Presented results demonstrate that photoactivity of co-doped titania cannot be considered as result of either independent action of dopants or their additive effect.
KW - Co-doping
KW - Intrinsic defects
KW - Phenol photodegradation
KW - Photocatalysis
KW - Shallow traps
KW - TiO
KW - Work function
UR - http://www.scopus.com/inward/record.url?scp=85086389248&partnerID=8YFLogxK
U2 - 10.1007/s11244-020-01292-1
DO - 10.1007/s11244-020-01292-1
M3 - Article
VL - 64
SP - 817
EP - 823
JO - Topics in catalysis
JF - Topics in catalysis
SN - 1022-5528
IS - 13-16
ER -