塩基内の水素酸化反応のための高い活性を持つプラチナコーティングの銅ナノワイヤ
Shaun M Alia1, Bryan S Pivovar, Yushan Yan
1Department of Chemical and Biomolecular Engineering, University of Delaware , Newark, Delaware 19716, United States.
Journal of the American Chemical Society
|August 20, 2013
まとめ
プラチナでコーティングされた銅ナノワイヤは,アルカリ媒体での強化された水素酸化反応 (HOR) 触媒を示しています. これらの新しいPt/CuNWsは,従来のプラチナ触媒と比較して優れた活性を示しています.
科学分野:
- 電気化学 電気化学について
- 材料科学 材料科学とは
- ナノテクノロジー ナノテクノロジー
背景:
- 水素酸化反応 (HOR) は燃料電池にとって極めて重要です.
- 効率的で費用対効果の高い触媒の開発は不可欠です.
- プラチナベースの触媒は効果的ですが,高価です.
研究 の 目的:
- HOR触媒としてプラチナコーティングされた銅ナノワイヤ (Pt/CuNWs) を合成し,評価する.
- Pt/CuNWsの性能を他のプラチナ触媒と比較するために.
- 触媒活動の強化における銅の役割を理解する.
主な方法:
- 銅ナノワイヤの部分的なガルバン移動によるPt/CuNWsの合成.
- Pt/CuNWsおよび他の触媒 (PtNT(Cu),5% ML Cu/BPPt, BPPt, Pt/C) をアルカリ溶液で電気化学的に試験する.
- 面積と質量の交換電流密度を用いたHOR活動の分析.
主要な成果:
- Pt/CuNWsは,Pt/C.と比較して,HORの活性が著しく高かった.
- Pt/CuNWは,Pt/Cよりも3.5倍の面積交換電流密度と1.9倍の質量交換電流密度を示した.
- 張力および表面効果による銅の含有は,プラチナのHOR活性に恩恵を与えた.
結論:
- Pt/CuNWsは,アルカリ性環境における水素酸化反応の有望な電気触媒である.
- Pt/CuNWの銅の存在は,触媒性能を向上させます.
- Pt/CuNWは,従来のプラチナ触媒よりも潜在的により費用対効果の高い代替品を提供します.
関連する概念動画
Formation of Complex Ions
18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K
Metal-Ligand Bonds
19.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.3K
Complexation Equilibria: The Chelate Effect
1.7K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.7K
Colloidal precipitates
5.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
5.7K
Electrodeposition
2.8K
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...
2.8K


