Details
| Original language | English |
|---|---|
| Pages (from-to) | 1292-1302 |
| Number of pages | 11 |
| Journal | Journal of Physical Chemistry C |
| Volume | 124 |
| Issue number | 2 |
| Early online date | 17 Dec 2019 |
| Publication status | Published - 16 Jan 2020 |
Abstract
Elemental doping into semiconductor-based photocatalysts to narrow the bandgap, thus extending the light absorption to visible light region, is a conventional and widely adopted strategy for water splitting (or artificial photosynthesis) application. However, one critical problem but rarely addressed, is the drastically decreased photocatalytic activity under UV light despite of the increased activity in visible light region, resulting in a decreased total performance under full solar spectrum. In order to elucidate the origin of the commonly observed phenomena, herein we choose La,Cr-codoped SrTiO 3 as a proof-of-concept model to probe the effect of dopants on the behavior of photogenerated charge carriers by transient absorption spectroscopy. By observing the excitons, it is found that under UV irradiation, the excitation occurring from the Cr impurity bands limits the excitation of SrTiO 3 from valence band, causing the drastic decrease of the photocatalytic activity over doped material. The widely proposed recombination at dopant sites, however, is not dominant for declining the UV light-irradiated performance, especially in the presence of reactant gas (methanol vapor).
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
Sustainable Development Goals
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In: Journal of Physical Chemistry C, Vol. 124, No. 2, 16.01.2020, p. 1292-1302.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photogenerated Charge Carriers Dynamics on La- and/or Cr-Doped SrTiO3 Nanoparticles Studied by Transient Absorption Spectroscopy
AU - Ichihara, Fumihiko
AU - Sieland, Fabian
AU - Pang, Hong
AU - Philo, Davin
AU - Duong, Anh Thu
AU - Chang, Kun
AU - Kako, Tetsuya
AU - Bahnemann, Detlef W.
AU - Ye, Jinhua
N1 - Funding Information: This work received financial support from the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitectonics (MANA), KAKENHI(18H02065, 18K05207), MEXT, Japan, and Photoexcitonix Project in Hokkaido University. The authors also thank Dr. Jenny Schneider for her fruitful discussion.
PY - 2020/1/16
Y1 - 2020/1/16
N2 - Elemental doping into semiconductor-based photocatalysts to narrow the bandgap, thus extending the light absorption to visible light region, is a conventional and widely adopted strategy for water splitting (or artificial photosynthesis) application. However, one critical problem but rarely addressed, is the drastically decreased photocatalytic activity under UV light despite of the increased activity in visible light region, resulting in a decreased total performance under full solar spectrum. In order to elucidate the origin of the commonly observed phenomena, herein we choose La,Cr-codoped SrTiO 3 as a proof-of-concept model to probe the effect of dopants on the behavior of photogenerated charge carriers by transient absorption spectroscopy. By observing the excitons, it is found that under UV irradiation, the excitation occurring from the Cr impurity bands limits the excitation of SrTiO 3 from valence band, causing the drastic decrease of the photocatalytic activity over doped material. The widely proposed recombination at dopant sites, however, is not dominant for declining the UV light-irradiated performance, especially in the presence of reactant gas (methanol vapor).
AB - Elemental doping into semiconductor-based photocatalysts to narrow the bandgap, thus extending the light absorption to visible light region, is a conventional and widely adopted strategy for water splitting (or artificial photosynthesis) application. However, one critical problem but rarely addressed, is the drastically decreased photocatalytic activity under UV light despite of the increased activity in visible light region, resulting in a decreased total performance under full solar spectrum. In order to elucidate the origin of the commonly observed phenomena, herein we choose La,Cr-codoped SrTiO 3 as a proof-of-concept model to probe the effect of dopants on the behavior of photogenerated charge carriers by transient absorption spectroscopy. By observing the excitons, it is found that under UV irradiation, the excitation occurring from the Cr impurity bands limits the excitation of SrTiO 3 from valence band, causing the drastic decrease of the photocatalytic activity over doped material. The widely proposed recombination at dopant sites, however, is not dominant for declining the UV light-irradiated performance, especially in the presence of reactant gas (methanol vapor).
UR - http://www.scopus.com/inward/record.url?scp=85078665939&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.9b09324
DO - 10.1021/acs.jpcc.9b09324
M3 - Article
VL - 124
SP - 1292
EP - 1302
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 2
ER -