陽子交換膜 (PEM) の水電解析アノドのための低Ir重量TiO2サポートされた酸素進化触媒の反応性と安定性
Hoang Phi Tran1,2, Hong Nhan Nong1, Matej Zlatar3,4
1Department of Chemistry, Chemical Engineering Division, The Electrochemical Energy, Catalysis and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany.
Journal of the American Chemical Society
|November 11, 2024
まとめ
この研究では,緑の水素の生産のためのイリジウム需要を大幅に減らす新しいTiO2サポートされたIr@IrO ((OH)) コアシェル触媒を導入しています. この新しい触媒は,酸素の進化反応の活性と水電解剤の安定性を高めます.
科学分野:
- 材料科学
- 電気化学
- キャタリシス
背景:
- イリジウム (Ir) の需要を削減することは,緑の水素生産のためのプロトン交換膜水電解剤 (PEM WE) の経済的な実行可能性にとって極めて重要です.
- イリジウムベースの触媒は,PEM WEにおける酸素進化反応 (OER) に不可欠であるが,その高いコストは,効率の向上を必要とする.
研究 の 目的:
- PEM WEでOERの性能を向上させるためのイリジウム含有量が減少した新しい触媒を発見し,特徴づけること.
- 新しい触媒の構造と活動の関係と,動作条件下での安定性を調査する.
主な方法:
- TiO2-サポートされたIr@IrO(OH) コアシェルナノ粒子の合成と特徴付け.
- オペランドXASやICP-MSのようなテクニックを用いて,OERの活動と安定性を電気化学的に評価する.
- 顕微鏡分析 (HAADF-EDX) で,触媒形態と触媒サポート相互作用 (CSI) を理解する.
主要な成果:
- Ir@IrO(OH) / TiO2コアシェル触媒は,OERの質量活性が著しく増加した (約. 1.53 VRHE) と商用基準と比較した.
- イリジウムの負荷は減少し,イリジウムの利用量を0.075gIr kW-1に低下させ,可動的なアノド層の厚さを実現した.
- 触媒は特殊な形態学的安定性と強いCSIを証明し,オペラントXASは可逆的なIr-O結合収縮と活性電気性O ((I-) 種の形成を明らかにした.
結論:
- TiO2 サポートの Ir@IrO ((OH)) コアシェルナノ粒子触媒は,グリーン水素生産におけるイリジウム消費を削減する有望な経路を提供します.
- 強力な触媒-サポート相互作用とIr-O結合のダイナミックな進化は,強化された触媒活動と安定性の鍵です.
- この発見により,より費用対効果が高く,持続可能なPEMの水分解技術への道が開けています.
さらに関連する動画
関連する概念動画
Electrolysis
26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K
Radical Oxidation of Allylic and Benzylic Alcohols
1.9K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
1.9K
Redox Equilibria: Overview
532
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...
532
Redox Titration: Other Oxidizing and Reducing Agents
245
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
245
Balancing Redox Equations
51.8K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
51.8K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
1.9K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.9K


