WEKO3
アイテム
Study on Titanium Dioxide Nanomaterials for Enhanced Photocatalytic and Dye-Sensitized Solar Cells Performances
https://kagawa-u.repo.nii.ac.jp/records/405
https://kagawa-u.repo.nii.ac.jp/records/405accbf8f4-9be8-4e3c-8f28-5f54596dbc2b
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
本文 (8.0 MB)
|
|
|
|
内容の要旨及び審査結果の要旨 (164.0 kB)
|
|
| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2020-03-09 | |||||||||||||
| タイトル | ||||||||||||||
| タイトル | Study on Titanium Dioxide Nanomaterials for Enhanced Photocatalytic and Dye-Sensitized Solar Cells Performances | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 資源タイプ | ||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||||||
| 資源タイプ | doctoral thesis | |||||||||||||
| アクセス権 | ||||||||||||||
| アクセス権 | open access | |||||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||||
| 著者 |
許, 林峰
× 許, 林峰
|
|||||||||||||
| 抄録 | ||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||
| 内容記述 | Abstract As one of the most promising wide-bandgap semiconductor materials, titanium dioxide (TiO2) has attracted a lot of interest for its potential applications, such as photocatalysts for water splitting and organic contaminator decomposition, dye sensitized solar cells (DSSCs) as well as perovskite solar cells (PSCs). The structure, surface area, crystallinity, and crystal-facet strongly affect its photocatalytic and photovoltaic performances. The present dissertation focusses on the environment-friendly and facile solvothermal processes for synthesis of titanium dioxide nanomaterials of various crystal phases with specific crystal-facets on their surfaces and controllable crystal size from titanium isopropoxide (TTIP) and tetramethylammonium hydroxide (TMAOH), and their enhanced photocatalytic and dye sensitized solar cells performances. The effects of the crystal-facet, nanocomposite of different crystal phase, and crystal morphology on the enhanced photocatalytic and dye sensitized solar cells performances are clarified by the systematical investigations. This dissertation is composed of four chapters as follows: In Chapter I, general introductions to the TiO2 materials, including the physical properties, crystal structures, surface structures, surface energy, photocatalytic reaction, synthesis processes of the TiO2 nanocrystals, and applications of the TiO2 nanocrystals to photocatalysts and solar cells. Furthermore, the purposes and contents of this research are also mentioned. In Chapter II, an environment-friendly and facile one-pot synthesis process for the [111]-faceted anatase nanocrystals with controllable crystal size from titanium isopropoxide (TTIP) and tetramethylammonium hydroxide (TMAOH) are described. The crystal size of anatase nanocrystal is strongly dependent on the pH value of reaction solution. The formation reaction mechanism of the [111]-faceted anatase TiO2 single nanocrystal is given based on the nanostructural study results. The photocatalytic studies on the [111]-faceted anatase TiO2 nanocrystals reveals that the photocatalytic activity is dependent on the crystal facet exposed on the nanocrystals, which increases in an order of non-facet < [111]-facet < {010}-facet for anatase nanocrystals. The photocatalytic activity increasing order matches with the bandgap energy increasing order. For the first time it has unveiled that the blue shift of bandgap energy with reducing crystal size is dependent on the facet exposed on the nanocrystal surface which increases in an order of non-facet < [111]-facet < {010}-facet. The DSSCs performance study also reveals the superiority of the [111]-faceted anatase nanocrystals due to the strong anchoring of the dye molecule on the [111]-faceted surface. In Chapter III, the syntheses of TiO2 polymorphs of brookite and anatase, and brookite-anatase nanocomposite in a mixed solution reaction system of titanium isopropoxide (TTIP) and tetramethylammonium hydroxide (TMAOH) and their photocatalytic performance are described. The hydrothermal formation mechanisms of TiO2 polymorphs were investigated systematically by using XRD, FE-SEM and HR-TEM observations. The titanate nanosheets with lepidocrocite-type layered structure are formed firstly, and then transformed to the TiO2 polymorphs by topotactic structural transformation reactions in the reaction system. The pH value and the concentration of TMA+ play the key roles in formation of TiO2 polymorphs. The brookite presents almost the same photocatalytic activity as that of the anatase, while the brookite-anatase nanocomposite exhibits a distinct higher photocatalytic activity than those of anatase and brookite due to the effective electron-hole separation effect by transferring photogenerated electrons from the brookite conduction band to the anatase conduction band in the nanocomposite, which results decrease of the electron-hole recombination. In Chapter IV, a summary of this dissertation is given. Importance of this dissertation for the fundamental study and applications in the photocatalysts and solar cells are also mentioned. |
|||||||||||||
| 言語 | en | |||||||||||||
| 学位名 | ||||||||||||||
| 言語 | ja | |||||||||||||
| 学位名 | 博士（工学） | |||||||||||||
| 学位授与機関 | ||||||||||||||
| 識別子Scheme | kakenhi | |||||||||||||
| 識別子 | 16201 | |||||||||||||
| 言語 | ja | |||||||||||||
| 機関名 | 香川大学 | |||||||||||||
| 言語 | en | |||||||||||||
| 機関名 | Kagawa University | |||||||||||||
| 学位授与年月日 | ||||||||||||||
| 学位授与年月日 | 2019-03-24 | |||||||||||||
| 学位授与番号 | ||||||||||||||
| 学位授与番号 | 甲第135号 | |||||||||||||
| 論文ID（NAID） | ||||||||||||||
| 識別子タイプ | NAID | |||||||||||||
| 関連識別子 | 500001374666 | |||||||||||||
| 関連サイト | ||||||||||||||
| 関連タイプ | isIdenticalTo | |||||||||||||
| 識別子タイプ | URI | |||||||||||||
| 関連識別子 | https://dl.ndl.go.jp/pid/11478720 | |||||||||||||
| 著者版フラグ | ||||||||||||||
| 出版タイプ | P | |||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_fa2ee174bc00049f | |||||||||||||
| KEID | ||||||||||||||
| 28769 | ||||||||||||||
