Details
| Original language | English |
|---|---|
| Pages (from-to) | 111-117 |
| Number of pages | 7 |
| Journal | Journal of Photochemistry and Photobiology A: Chemistry |
| Volume | 366 |
| Early online date | 13 Mar 2018 |
| Publication status | Published - 1 Nov 2018 |
Abstract
Plasmonic photocatalysis has recently accelerated the rapid progress in enhancing photocatalytic efficiency upon visible light illumination, increasing the prospect of utilizing sunlight for environmental and energy applications. It has been reported that Au-TiO 2 photocatalysts exhibit photocatalytic activity for H 2 evolution under visible light illumination above 420 nm. This visible-light photocatalytic activity was attributed to the surface plasmon resonance (SPR) effect of the Au nanoparticles and the underlying mechanism has been discussed between the direct electron transfer (DET) process and resonance energy transfer (RET) process. However, most of the experiments have been reported to employ a 420 nm cutoff filter which indeed covers the absorbance tail of TiO 2. In this contribution, it was confirmed that photocatalytic H 2 gas formation over Au-TiO 2 (anatase) can be obtained upon visible light illumination near the absorption edge of TiO 2 (using a 420 nm filter). By means of EPR spectroscopy and Laser Flash Photolysis spectroscopy, we obtained direct experimental evidence that bare anatase TiO 2 can be excited by visible light illumination at 420 nm and excited-state electrons migrate to the surface-loaded Au nanoparticles. In the presence of a 500 nm cutoff filter, however, no SPR-induced H 2 formation was detected, although the plasmon band maximum of Au was completely illuminated. The obtained results revealed the catalytic role of Au on Au-TiO 2 for H 2 evolution upon visible light illumination (≥420 nm), employing pure anatase as TiO 2 source.
Keywords
- EPR spectroscopy, H production, Laser flash photolysis, Surface plasmon resonance, Visible light
ASJC Scopus subject areas
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In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 366, 01.11.2018, p. 111-117.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The role of Au loading for visible-light photocatalytic activity of Au-TiO2 (anatase)
AU - Nie, Jinlin
AU - Schneider, Jenny
AU - Sieland, Fabian
AU - Xia, Shuwei
AU - Bahnemann, Detlef W.
N1 - © 2018 Elsevier B.V. All rights reserved.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Plasmonic photocatalysis has recently accelerated the rapid progress in enhancing photocatalytic efficiency upon visible light illumination, increasing the prospect of utilizing sunlight for environmental and energy applications. It has been reported that Au-TiO 2 photocatalysts exhibit photocatalytic activity for H 2 evolution under visible light illumination above 420 nm. This visible-light photocatalytic activity was attributed to the surface plasmon resonance (SPR) effect of the Au nanoparticles and the underlying mechanism has been discussed between the direct electron transfer (DET) process and resonance energy transfer (RET) process. However, most of the experiments have been reported to employ a 420 nm cutoff filter which indeed covers the absorbance tail of TiO 2. In this contribution, it was confirmed that photocatalytic H 2 gas formation over Au-TiO 2 (anatase) can be obtained upon visible light illumination near the absorption edge of TiO 2 (using a 420 nm filter). By means of EPR spectroscopy and Laser Flash Photolysis spectroscopy, we obtained direct experimental evidence that bare anatase TiO 2 can be excited by visible light illumination at 420 nm and excited-state electrons migrate to the surface-loaded Au nanoparticles. In the presence of a 500 nm cutoff filter, however, no SPR-induced H 2 formation was detected, although the plasmon band maximum of Au was completely illuminated. The obtained results revealed the catalytic role of Au on Au-TiO 2 for H 2 evolution upon visible light illumination (≥420 nm), employing pure anatase as TiO 2 source.
AB - Plasmonic photocatalysis has recently accelerated the rapid progress in enhancing photocatalytic efficiency upon visible light illumination, increasing the prospect of utilizing sunlight for environmental and energy applications. It has been reported that Au-TiO 2 photocatalysts exhibit photocatalytic activity for H 2 evolution under visible light illumination above 420 nm. This visible-light photocatalytic activity was attributed to the surface plasmon resonance (SPR) effect of the Au nanoparticles and the underlying mechanism has been discussed between the direct electron transfer (DET) process and resonance energy transfer (RET) process. However, most of the experiments have been reported to employ a 420 nm cutoff filter which indeed covers the absorbance tail of TiO 2. In this contribution, it was confirmed that photocatalytic H 2 gas formation over Au-TiO 2 (anatase) can be obtained upon visible light illumination near the absorption edge of TiO 2 (using a 420 nm filter). By means of EPR spectroscopy and Laser Flash Photolysis spectroscopy, we obtained direct experimental evidence that bare anatase TiO 2 can be excited by visible light illumination at 420 nm and excited-state electrons migrate to the surface-loaded Au nanoparticles. In the presence of a 500 nm cutoff filter, however, no SPR-induced H 2 formation was detected, although the plasmon band maximum of Au was completely illuminated. The obtained results revealed the catalytic role of Au on Au-TiO 2 for H 2 evolution upon visible light illumination (≥420 nm), employing pure anatase as TiO 2 source.
KW - EPR spectroscopy
KW - H production
KW - Laser flash photolysis
KW - Surface plasmon resonance
KW - Visible light
UR - http://www.scopus.com/inward/record.url?scp=85044331232&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2018.03.016
DO - 10.1016/j.jphotochem.2018.03.016
M3 - Article
VL - 366
SP - 111
EP - 117
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
ER -