水酸化触媒へのインターフェイス・プロトン・カップリング・電子移転の再構成エネルギー
Matthew Kessinger1, Alexander V Soudackov2, Jenny Schneider1
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina27599, United States.
Journal of the American Chemical Society
|October 31, 2022
まとめ
この研究は,水酸化触媒におけるインターフェイス電子移転 (ET) とプロトン結合ET (PCET) の再構成エネルギーを定量化している. 発見は,Marcus-Gerischer理論を証明する,高いpHで太陽の水酸化の運動的優位性を明らかにする
科学分野:
- 光触媒
- 無機化学
- 物理化学
背景:
- 効率的な太陽水酸化には,インターフェイス電子移転 (ET) と陽子結合ET (PCET) の運動を理解する必要があります.
- マーカス・ゲリッシャー理論は ET反応における再構成エネルギーの分析に不可欠です.
- この理論をPCETに拡張することは,触媒プロセスを最適化するために不可欠です.
研究 の 目的:
- インジウム亜鉛酸化物 (ITO) から水酸化触媒への界面ETとPCETの再構成エネルギー (λ) を決定する.
- これらの界面反応の動力学に対するpHの影響を調査する.
- マーカス・ゲーリッシャー理論をPCETに拡張する
主な方法:
- 可視光照射下でのインターフェイスETとPCET反応の運動分析.
- リオーガナイゼーションエネルギーを抽出するための実験データへのマーカス-ゲリッシャー理論の適用.
- 内部圏の再編成エネルギー貢献を明らかにする計算モデルです.
主要な成果:
- リオーガナイゼーションエネルギーは,ET に対して λ = 0. 40 ± 0. 02 eV,PCET に対して λ = 0. 90 ± 0. 02 eVを決定した.
- PCETの速度定数は,ETとは異なり,pHの増加とともに減少した.
- PCETのより大きな内部球体再構成エネルギーは計算的に確認されました.
結論:
- マーカス・ゲリッシャー理論は,PCETに確実に拡張され,反応機構の洞察を提供することができる.
- 太陽光による水酸化は,PCETが減少したため,高いpHで運動的に好ましい.
- 効率的な光触媒の設計には 重組エネルギーを理解することが重要です
関連する概念動画
Oxidation and Reduction of Organic Molecules
7.1K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
7.1K
Electron Transport Chains
101.2K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
101.2K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
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.
2.4K
Interfacial Electrochemical Methods: Overview
351
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
351
Oxidative Cleavage of Alkenes: Ozonolysis
10.9K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.9K
Redox Equilibria: Overview
616
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
616


![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)