| アイテムタイプ |
学術雑誌論文 = Journal Article(1) |
| 公開日 |
2023-12-15 |
| 資源タイプ |
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|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| タイトル |
|
|
タイトル |
Photoacoustic Spectroscopic Analysis of Electron-Trapping Sites in Titanium(IV) Oxide Photocatalyst Powder Treated by Ball Milling |
|
言語 |
en |
| その他のタイトル |
|
|
その他のタイトル |
Photoacoustic Spectroscopic Analysis of Electron Trapping Sites in Titanium(IV) Oxide Photocatalyst Powder Treated by Ball Milling |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 著者 |
Shinoda Tatsuki
Yamaguchi Yuichi
Kudo Akihiko
村上, 直也
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| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
Photoabsorption of trapped electrons in rutile titanium(IV) oxide (TiO2) before and after ball-milling and annealing treatments was investigated in a wide range of light wavelengths from visible to mid-infrared (IR) regions using photoacoustic spectroscopy (PAS). In the presence of an electron donor under an inert gas atmosphere, photoacoustic signals for all of the samples were increased by ultraviolet irradiation, resulting in the appearance of broad absorption due to electron accumulation in TiO2. For ball-milled TiO2 with a large specific surface area (34 m2 g–1), mid-IR absorption attributed to free electrons and shallowly trapped electrons was smaller than that of the pristine sample with a small specific surface area (2.8 m2 g–1), but broad absorption ascribed to deeply trapped electrons dramatically increased in the range of near-IR to visible regions. This near-IR–visible absorption was slightly observed even in the presence of oxygen, and it was divided into two parts: one was characteristic near-IR absorption of rutile TiO2 having a peak at ∼1.0 eV below the bottom of the conduction band, while the other was ball-milling-induced absorption with a peak at ∼1.7 eV. By annealing treatment, absorptions of free electrons/shallowly trapped electrons and deeply trapped electrons increased and decreased, respectively, although not as much as in the pristine sample. At that time, the specific surface area also decreased to 18 m2 g–1. In the evaluation of photocatalytic activity, pristine TiO2 showed the highest activity for hydrogen (H2) evolution from an aqueous solution containing an electron donor, whereas the rates of H2 evolution for the ball-milled and subsequently annealed samples were 0.21 and 0.34 times lower than that for the pristine sample. Thus, we found from the results of PAS measurements that the main factor governing the photocatalytic activity is not specific surface area but the presence of deeper-energy electron-trapping sites formed by pulverization with ball milling. |
|
言語 |
en |
| 書誌情報 |
en : The Journal of physical chemistry. C
巻 126,
号 49,
p. 20975-20982,
発行日 2022-12-01
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| 出版社 |
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出版者 |
American Chemical Society |
|
言語 |
en |
| DOI |
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|
関連タイプ |
isVersionOf |
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|
識別子タイプ |
DOI |
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|
関連識別子 |
https://doi.org/10.1021/acs.jpcc.2c07064 |
| NCID |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA1217589X |
| ISSN |
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収録物識別子タイプ |
EISSN |
|
収録物識別子 |
1932-7455 |
| ISSN |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
1932-7447 |
| 著作権関連情報 |
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|
権利情報 |
This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in The Journal of physical chemistry. C, Copyright (c) American Chemical Society after peer review. To access the final edited and published work, see https://doi.org/10.1021/acs.jpcc.2c07064. |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Absorption |
| キーワード |
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|
主題Scheme |
Other |
|
主題 |
Ethanol |
| キーワード |
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|
主題Scheme |
Other |
|
主題 |
Granular materials |
| キーワード |
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|
主題Scheme |
Other |
|
主題 |
Irradiation |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Oxides |
| 出版タイプ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| 査読の有無 |
|
|
値 |
yes |
| 研究者情報 |
|
|
URL |
https://hyokadb02.jimu.kyutech.ac.jp/html/124_ja.html |
10406150.pdf (2.1 MB)
