相关实验视频

Updated: Jul 13, 2025

On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

Published on: March 16, 2018

一个对-Pt电催化剂的模型研究:稳定性,氧化还原特性和间

Lukáš Fusek^1,2, Pankaj Kumar Samal¹, Jiří Keresteš¹

¹Charles University, Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Praha 8, Czech Republic. josef.myslivecek@mff.cuni.cz.

Physical chemistry chemical physics : PCCP

|October 18, 2023

概括

先进的金属氧化物催化剂表现出大小依赖的行为. 较小的ceria纳米岛在水合物上,并使地下氧化还原过渡成为可能,缓解了进化反应.

科学领域:

表面科学是一门科学.
电触媒溶解是一种电触媒.
材料科学是一种材料科学.

背景情况:

金属氧化物催化剂的性能依赖于活性相之间的协同相互作用.
催化剂活性相在反应条件下通过电解质相互作用形成.

研究的目的:

在 (Pt) 上研究二氧化 (CeO2) 纳米岛的表面科学和电化学.
了解CeO2纳米岛在性电解质中在不同电位下的行为.

主要方法:

使用扫描道显微镜 (STM),X射线光电子光谱 (XPS) 和低能电子衍射 (LEED).
使用循环电压计 (CV) 进行了电化学研究.
在0.1M KOH中研究了Pt上的CeO2{111}纳米岛{111}.

主要成果:

观察到CeO2纳米岛的尺寸和制备依赖的行为.
大型纳米岛显示了面积有限的Ce3+/Ce4+氧化还原活性.
较小的纳米岛 (<~5 nm) 转换为含水阶段与地下氧化还原过渡.
在 Pt 上的吸附是独立于 CeO2 覆盖的,归因于间隙.
间化并没有参与的进化,只是调节了反应.

结论:

CeO2纳米岛的尺寸和制备方法极大地影响了它们的电化学特性和与Pt.的相互作用.
水合,较小的CeO2纳米岛表现出独特的氧化还原行为,并可以通过间隔调节进化.
结果为电催化物的金属氧化物/金属接口提供了基本的见解.

更多相关视频

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Published on: June 21, 2017

相关概念视频

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

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.