负白金通过Pt─Ni电子桥梁稳定在缺氧的NiFe-LDH上,用于增强的电催化进化
Shijie Shen1,2, Qingao Li2,3, Huanhuan Zhang2
1School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, China.
Advanced materials (Deerfield Beach, Fla.)
|March 5, 2025
概括
在缺氧的NiFe-LDH中定负电荷的金增强了进化反应. 这种新的催化剂设计可以减少白金.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 进化反应 (HER) 对清洁能源技术至关重要.
- 原子分散 (Pt) 催化剂对 HER 是有前途的,但由于非金属原子与支物的结合,它们经常遭受高氧化状态.
- 优化支金属催化剂的电子结构和协调环境是提高其电催化性能的关键.
研究的目的:
- 开发一种用于提高演化反应 (HER) 性能的新型电催化剂.
- 研究氧气空缺和特定的金属-金属键在调整原子分散的电子特性中的作用.
- 为了实现HER的高催化活性和低超潜能.
主要方法:
- 在缺氧的铁层双氧化物 (NiFe-LDH) 中定原子分散的合成.
- 催化剂的电子结构,协调环境和氧空位度的表征.
- 电化学评估催化剂在演化反应中的性能,使用循环电压测量和时电压测量等技术.
主要成果:
- 通过Pt-Ni键,Pt原子成功地固定在缺氧的NiFe-LDH中,从而降低了Pt的价值状态.
- 在NiFe-LDH中空缺的氧气促进了电子转移,进一步降低了Pt的氧化状态并增强了吸附.
- 与商业Pt/C相比,催化剂表现出异常低的超电位 (4mV在1M KOH中,9mV在1M KPi中在10mA cm-2) 和显著更高的质量活性.
结论:
- 通过Pt-Ni键在缺氧的NiFe-LDH中定原子分散是一种有效的策略来增强HER.
- 催化剂的协调环境和电子结构的合理设计,特别是利用空缺的氧气,提高了催化剂的效率.
- 这项工作为开发用于电化学应用的高性能支金属催化剂提供了新的途径.
更多相关视频
09:18Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
Published on: June 21, 2017
11.4K
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
3.4K
相关概念视频
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
3.2K
02:13Reduction of Alkenes: Catalytic Hydrogenation
11.8K
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...
11.8K
02:50Catalysis
26.5K
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.
26.5K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.6K
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.
7.6K