酸化マンガンと金の相互作用を理解し,電気触媒による水の酸化のための強化された活性につながります
Yelena Gorlin1, Chia-Jung Chung, Jesse D Benck
1Department of Chemical Engineering, ‡Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
Journal of the American Chemical Society
|March 26, 2014
まとめ
酸化マンガンに金のナノ粒子を加えると,酸素進化反応 (OER) の活性が著しく上昇する. この発見は,再生可能エネルギー技術のための先進的な非貴金属電触媒を開発するためのスケーラブルな経路を提供します.
科学分野:
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
- カタリシス カタリシス カタリシス
背景:
- 酸素進化反応 (OER) のための効率的な電気触媒の開発は,再生可能エネルギー技術にとって極めて重要です.
- OERの移行金属酸化物に関する以前の研究は,貴金属の支柱効果に関して矛盾する結果をもたらしました.
研究 の 目的:
- OERの活性を増強するために,移行金属酸化物触媒とそれらの金属支柱との相互作用を明確にするために.
- 電気触媒における金 (Au) と酸化マンガン (MnO(x)) の相乗効果を調査する.
主な方法:
- 納米粒子の金 (Au) を支柱として,納米粒子の酸化マンガン (MnO(x)) を活性触媒として構成した触媒システムを試験した.
- Au-MnO ((x)) システムのOER活動と売上高頻度 (TOF) を定量化しました.
主要な成果:
- Au-MnO (x) システムは,純粋なMnO (x) と比較して,OER活動の有意な向上を示した.
- 純粋なMnO (x) 触媒については,以前に報告されたよりも数桁高い回転頻度 (TOF) を観測した.
- AuとMnO (x) の間の局所的な相互作用が,集団的な効果ではなく,活性増強の原因であることを示す証拠を提供した.
結論:
- 金と酸化マンガンの間の局所的な相互作用は,OERの性能を相乗的に高めます.
- わずかな量の黄金でさえ,非貴金属ベースのOER触媒の活性を大幅に改善することができます.
- このアプローチは,持続可能なエネルギーアプリケーションのための改良された電気触媒を設計するためのスケーラブルな戦略を提供します.
さらに関連する動画
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
14.1K
09:02Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
Published on: June 18, 2020
12.9K
関連する概念動画
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.2K
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...
2.2K
02:58Balancing Redox Equations
48.4K
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...
48.4K
01:24Microbes and Other Elemental Cycles
89
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
89
01:08Electrodeposition
2.7K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
2.7K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
15.6K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
15.6K
01:30Ladder Diagrams: Redox Equilibria
921
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
921