相关实验视频

Updated: Jun 1, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

通过异质H2的探测通过原子层沉积的Ceria在室温下激活

Carlos Morales¹, Rudi Tschammer¹, Emilia Pożarowska¹

¹Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Zuse-Straße 1, 03046, Cottbus, Germany.

|January 17, 2025

概括

超薄原子层沉积的膜在室温下激活. 这一对于低温传感器至关重要的过程,由于内在膜缺陷,在没有贵金属的情况下发生.

科学领域:

材料科学材料科学材料科学
表面化学表面化学
纳米技术纳米技术

背景情况:

超薄的膜在催化应用中表现出独特的特性.
激活对于各种化学过程和传感器技术至关重要.
贵金属催化剂通常需要高效的解离.

研究的目的:

为了研究在室温下超薄原子层沉积 (ALD) 膜的异解激活能力.
了解表面减少机制和ALD-ceria.内在缺陷的作用.
为了证明ALD-ceria在没有贵金属催化剂的低温探测中的潜力.

主要方法:

使用原子层沉积 (ALD) 制造超薄的膜.
使用近环境压力X射线光电子谱学 (NAP-XPS) 对相互作用的现场分析.
在基于电阻的传感器测试结构中评估传感性能.

主要成果:

在室温下,ALD-ceria膜 (<20 nm) 显示出H2异质活化和显著的表面减少.
降低取决于H2度,特别是在稀释的H2/O2环境中 (<10%H2).
表面氧化诱导电荷转移,将Ce4+降低到Ce3+,模仿没有贵金属的金属氧化物感应机制.
在ALD-ceria的内在缺陷对反应性至关重要; 后化减少了这种活动.
传感器测试结构在低工作温度下对低H2度的反应中显示出阻力变化.

结论:

超薄的ALD-ceria具有室温激活和感应的内在能力,消除了对贵金属催化剂的需求.
观察到的传感机制依赖于表面氧化和电荷转移,受薄膜缺陷结构的影响.
未来的应用可能涉及将ALD-ceria与其他金属氧化物集成在一起,通过界面电荷传输来提高传感器性能.

关键词:

这就是ALD.这是NAP-XPS.这里是CeriaCeria.减少减少减少减少在室温室温.

更多相关视频

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

Published on: August 17, 2016

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

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...

Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.