Details
| Original language | English |
|---|---|
| Pages (from-to) | 25881-25887 |
| Number of pages | 7 |
| Journal | RSC Advances |
| Volume | 8 |
| Issue number | 46 |
| Early online date | 19 Jul 2018 |
| Publication status | Published - 2018 |
Abstract
The Surface Plasmon Resonance (SPR) driven photocatalytic H 2 production upon visible light illumination (≥500 nm) was investigated on gold-loaded TiO 2 (Au-TiO 2). It has been clearly shown that the Au-SPR can directly lead to photocatalytic H 2 evolution under illumination (≥500 nm). However, there are still some open issues about the underlying mechanism for the SPR-driven photocatalytic H 2 production, especially the explanation of the resonance energy transfer (RET) theory and the direct electron transfer (DET) theory. In this contribution, by means of the EPR and laser flash photolysis spectroscopy, we clearly showed the signals for different species formed by trapped electrons and holes in TiO 2 upon visible light illumination (≥500 nm). However, the energy of the Au-SPR is insufficient to overcome the bandgap of TiO 2. The signals of the trapped electrons and holes originate from two distinct processes, rather than the simple electron-hole pair excitation. Results obtained by Laser Flash Photolysis spectroscopy evidenced that, due to the Au-SPR effect, Au NPs can inject electrons to the conduction band of TiO 2 and the Au-SPR can also initiate e -/h + pair generation (interfacial charge transfer process) upon visible light illumination (≥500 nm). Moreover, the Density Functional Theory (DFT) calculation provided direct evidence that, due to the Au-SPR, new impurity energy levels occurred, thus further theoretically elaborating the proposed mechanisms.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
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In: RSC Advances, Vol. 8, No. 46, 2018, p. 25881-25887.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - New insights into the surface plasmon resonance (SPR) driven photocatalytic H2 production of Au–TiO2
AU - Nie, Jinlin
AU - Schneider, Jenny
AU - Sieland, Fabian
AU - Zhou, Long
AU - Xia, Shuwei
AU - Bahnemann, Detlef W.
N1 - Funding information: Financial Support from the China Scholarship Council is gratefully acknowledged. The authors would like to thank the LNQE for TEM measurements. J. S. and D. B. kindly acknowledge ?nancial support from the Federal Ministry of Education and Research (BMBF) for the project “DuaSol” (03SF0482C). F. S. and D. B. kindly acknowledge ?nancial support from the Federal Ministry of Education and Research (BMBF) for the project “PureBau” (13N13350).
PY - 2018
Y1 - 2018
N2 - The Surface Plasmon Resonance (SPR) driven photocatalytic H 2 production upon visible light illumination (≥500 nm) was investigated on gold-loaded TiO 2 (Au-TiO 2). It has been clearly shown that the Au-SPR can directly lead to photocatalytic H 2 evolution under illumination (≥500 nm). However, there are still some open issues about the underlying mechanism for the SPR-driven photocatalytic H 2 production, especially the explanation of the resonance energy transfer (RET) theory and the direct electron transfer (DET) theory. In this contribution, by means of the EPR and laser flash photolysis spectroscopy, we clearly showed the signals for different species formed by trapped electrons and holes in TiO 2 upon visible light illumination (≥500 nm). However, the energy of the Au-SPR is insufficient to overcome the bandgap of TiO 2. The signals of the trapped electrons and holes originate from two distinct processes, rather than the simple electron-hole pair excitation. Results obtained by Laser Flash Photolysis spectroscopy evidenced that, due to the Au-SPR effect, Au NPs can inject electrons to the conduction band of TiO 2 and the Au-SPR can also initiate e -/h + pair generation (interfacial charge transfer process) upon visible light illumination (≥500 nm). Moreover, the Density Functional Theory (DFT) calculation provided direct evidence that, due to the Au-SPR, new impurity energy levels occurred, thus further theoretically elaborating the proposed mechanisms.
AB - The Surface Plasmon Resonance (SPR) driven photocatalytic H 2 production upon visible light illumination (≥500 nm) was investigated on gold-loaded TiO 2 (Au-TiO 2). It has been clearly shown that the Au-SPR can directly lead to photocatalytic H 2 evolution under illumination (≥500 nm). However, there are still some open issues about the underlying mechanism for the SPR-driven photocatalytic H 2 production, especially the explanation of the resonance energy transfer (RET) theory and the direct electron transfer (DET) theory. In this contribution, by means of the EPR and laser flash photolysis spectroscopy, we clearly showed the signals for different species formed by trapped electrons and holes in TiO 2 upon visible light illumination (≥500 nm). However, the energy of the Au-SPR is insufficient to overcome the bandgap of TiO 2. The signals of the trapped electrons and holes originate from two distinct processes, rather than the simple electron-hole pair excitation. Results obtained by Laser Flash Photolysis spectroscopy evidenced that, due to the Au-SPR effect, Au NPs can inject electrons to the conduction band of TiO 2 and the Au-SPR can also initiate e -/h + pair generation (interfacial charge transfer process) upon visible light illumination (≥500 nm). Moreover, the Density Functional Theory (DFT) calculation provided direct evidence that, due to the Au-SPR, new impurity energy levels occurred, thus further theoretically elaborating the proposed mechanisms.
UR - http://www.scopus.com/inward/record.url?scp=85050732712&partnerID=8YFLogxK
U2 - 10.1039/C8RA05450A
DO - 10.1039/C8RA05450A
M3 - Article
VL - 8
SP - 25881
EP - 25887
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 46
ER -