赤外線誘発異常欠陥媒介のプラズモンの熱い電子移転により,光触媒的水素の進化が強化される
Zichao Lian1, Fan Wu1, Jiangzhi Zi1
1School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China.
Journal of the American Chemical Society
|July 7, 2023
まとめ
新しいCuS@ZnSコア@シェルナノ結晶は 効率的な太陽光から燃料への変換のために 赤外線を活用します これらのナノ結晶は,新しいプラズモン誘発の欠陥媒介のキャリア転送メカニズムを通じて,水素進化反応における強化された光触媒活性を示しています.
科学分野:
- 材料科学
- 光触媒
- ナノテクノロジー
背景:
- 太陽光発電の効率的な利用は 持続可能な燃料生産に不可欠です
- 太陽エネルギーの約半分を占める赤外線は 太陽光から燃料に変換する過程で 十分に活用されていないままです
- 光触媒活性を増強するための先進的な材料の開発は不可欠です.
研究 の 目的:
- 赤外線 (IR) 領域における局所的な表面プラズモン共鳴 (LSPR) を用いたCuS@ZnSコア@シェルナノ結晶 (CSNC) を合成し,特徴づけること.
- 水素進化反応 (HER) でのCSNCの光触媒活性強化を調査する.
- "プラズマ誘発欠陥媒介キャリア移転" (PIDCT) と呼ばれる基礎メカニズムを明らかにし,パフォーマンスの改善に責任があります.
主な方法:
- CuS@ZnSコア@シェルナノ結晶 (CSNC) の合成
- IR光領域におけるLSPR特性の特徴
- キャリアダイナミクスを研究するための時間解像度トランジントスペクトロスコーピー.
- 近赤外線照射下での水素進化反応 (HER) の光触媒活性の評価
主要な成果:
- CSNCは,IR地域で強いLSPRの特徴を示しています.
- HERは29. 2%の高い量子収量を達成した.
- CuS@ZnS CSNCは,対照物質と比較して,HER率 (26. 9 μmol h−1 g−1) を有意に増加させました.
- ヘテロインターフェイスにおけるユニークなPIDCTメカニズムが,性能の鍵として特定されました.
結論:
- CuS@ZnS CSNCは,IR光を用いた水素進化の効果的な光触媒である.
- PIDCTメカニズムは,LSPRによって生成されたキャリア運動を最適化するための経路を提供します.
- LSPRナノ結晶の欠陥工学は,太陽光から燃料への変換効率を改善するための有望な戦略を提供します.
関連する概念動画
Photosystem II
59.9K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
59.9K
Photoelectric Effect
30.7K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
30.7K
The Z-Scheme of Electron Transport in Photosynthesis
12.6K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
12.6K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.1K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.1K
Radical Formation: Homolysis
3.6K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.6K
Photoluminescence: Applications
1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
1.3K


