在Pt/TiO2催化二极管上对电子转移到表面CO键的直接控制
Prashant Deshlahra1, William F Schneider, Gary H Bernstein
1Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Journal of the American Chemical Society
|September 28, 2011
概括
我们展示了在/二氧化 (Pt/TiO2) 交叉点的电压控制电子转移,改变一氧化碳 (CO) 吸附键. 这种催化二极管为表面化学控制提供了新的途径.
科学领域:
- 表面科学是一门学科.
- 不同质的催化剂.
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 控制金属半导体接口的电子传输对于催化和电子设备至关重要.
- 一氧化碳 (CO) 在金属表面的吸附是一种研究表面化学键的模型系统.
- 现有的修改表面键的方法往往缺乏外部电子控制.
研究的目的:
- 通过应用外部电压来研究在Pt/TiO2连接处控制电子转移的情况.
- 探索电子转移和被吸附的CO的振动频率之间的相关性.
- 为了证明多层催化二极管在电压控制的表面化学中的潜力.
主要方法:
- 多层催化二极管结构的制造,具有Pt/TiO2连接点.
- 使用红外吸收光谱来监测CO吸附和振动频率.
- 进行红外偏振和视角依赖的研究,以探测分子方向和近距离效应.
主要成果:
- 在 Pt/TiO2 连接处表现出 Schottky 二极管的行为.
- 应用电压直接调节电子转移,导致吸附的CO振动频率的可逆转移.
- 振动频率的变化取决于CO分子的方向和接近Pt/TiO2接口的距离.
结论:
- 金属支接口的外部电子修改可以控制金属吸附剂键.
- 催化二极管为电压驱动的表面化学键的控制提供了一种新的方法.
- 潜在的应用包括先进的异质催化,化学传感器和等离子体装置.
相关概念视频
Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Controlled-Current Coulometry: Overview
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
Processes at Electrodes
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...


