在Pt表面上的Pd-Ru对促进氧化和性介质的进化
Longsheng Cao1, Fernando A Soto2, Dan Li1
1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA.
Nature communications
|August 22, 2024
概括
在性介质中的氧化反应的白金催化剂使用-对增强. 这种新的方法可以提高燃料电池和氨压缩机的催化活性,而不会牺牲表面积.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧化反应 (HOR) 对性燃料电池和电化学氨压缩机至关重要.
- 目前 (Pt) 催化剂用于性介质中的HOR是昂贵的,并且由于反应动力学缓慢,需要高负载.
- 过渡金属装饰可以提高Pt催化剂活性,但往往会降低电化学活性表面积,限制质量活性.
研究的目的:
- 为了增强催化剂的活性,用于氧化反应在性介质.
- 为了克服在过渡金属装饰的Pt催化剂中减少表面积的局限性.
- 为性燃料电池和氨压缩机开发一种更有效,更具成本效益的催化剂.
主要方法:
- 装饰- (Pd-Ru) 对 (Pt) 上使用温和的催化热热解方法.
- 使用扩展的X射线吸收细结构 (EXAFS) 和高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 进行装饰催化剂的表征.
- 计算模拟包括密度函数理论 (DFT) 和ab-initio分子动力学 (AIMD) 以了解多吸附.
主要成果:
- 在Pt上成功装饰了Pd-Ru对,由EXAFS和HAADF-STEM证实.
- DFT和AIMD模拟显示了Pd和Ru药物的首选吸附点.
- 装饰Pd-Ru的Pt催化剂实现了高质量交换电流密度为1557±85Ag-1的HOR.
- 在氨压缩机应用中证明了卓越的性能.
结论:
- Pd-Ru对装饰策略有效地增强了性介质中HOR的Pt催化剂活性.
- 这种方法避免了通常在其他装饰方法中观察到的电化学活性表面积的减少.
- 开发的催化剂在提高性燃料电池和电化学氨压缩机的效率方面显示出显著的希望.
相关概念视频
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
11.9K
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...
11.9K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
7.7K