高分散的Ni-Pt双金属催化剂:协同效应在光催化进化过程中产生了类似Pt的活性
Cong Wang1, Diana Dragoe2, Christophe Colbeau-Justin1
1Institut de Chimie Physique, UMR 8000 CNRS, Université Paris-Saclay, Orsay 91405, France.
ACS applied materials & interfaces
|August 31, 2023
概括
开发具有成本效益的 (Pt) 和 (Ni) 双金属共催化剂用于演化反应 (HER) 是关键. 这项研究揭示了一种协同机制,其中Ni提供电子,Pt捕获电子,增强光催化活性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 摄影化学的使用.
背景情况:
- (Pt) 是进化反应 (HER) 的关键但昂贵的共催化剂.
- 双金属- (Ni-Pt) 催化剂显示出由于增强的光催化活性,可以替代纯Pt.
- 在Ni-Pt催化剂中的协同作用机制需要进一步研究.
研究的目的:
- 调查Ni-Pt双金属催化剂在TiO2.2上的协同光催化机制.
- 要了解催化剂中Ni和Pt之间的电子转移动态.
- 为了优化Ni/Pt比率,为HER.提供具有成本效益和高性能的光催化剂.
主要方法:
- 在TiO2上沉积高度分散的Ni-Pt双金属催化剂,使用放射性还原.
- 使用先进的表征技术研究光生成的电荷载体动态.
- 对演化反应 (HER) 的光催化活性评估.
主要成果:
- 一个协同的电子转移机制被阐明:Ni作为电子供应商,Pt作为电子陷.
- 光催化性能取决于Ni/Pt比,Ni2-Pt1显示最佳结果.
- 与裸体TiO2相比,Ni2-Pt1-编的TiO2的HER性能增加了40倍,显示出强大的稳定性.
结论:
- Ni-Pt双金属催化剂为HER提供了一种成本效益高的替代品,而不是纯Pt.
- 阐明的协同作用机制提高了光催化效率和稳定性.
- 优化Ni-Pt/TiO2为大规模气生产应用提供了一个有前途的材料.
更多相关视频
08:40Synthesis 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
3.6K
11:49A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
Published on: April 10, 2019
9.8K
相关概念视频
02:50Catalysis
27.0K
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.
27.0K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.2K
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...
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...
12.2K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.8K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.8K