支持TiO的RuIr合金作为氧化的高效和耐CO催化剂
Lingfei Li1, Haishan Liu1, Chenhui Xu1
1Institute for New Energy Materials & Engineering, School of Materials Science & Engineering, Fuzhou University, Fuzhou City, Fujian Province 350108, PR China; Fujian Engineering Research Center of High Energy Batteries and New Energy Equipment & Systems, Fuzhou University, Fuzhou City, Fujian Province 350108, PR China.
在氧化上的-合金催化剂显示出增强的性氧化反应 (HOR) 活性和CO耐受性. 这种RuIr/TiO催化剂为燃料电池应用提供了一个有前途的替代品.
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:
- (Ru) 是氧化反应 (HOR) 的有希望的催化剂,因为它具有有利的结合能量和氧 afinity.
- 对于Ru催化剂的挑战包括有限的内在活性和对一氧化碳 (CO) 中毒的耐受性差.
- 开发高效且耐用的HOR催化剂对于推进燃料电池技术至关重要.
研究的目的:
- 设计和合成一种高效且耐用的性HOR催化剂,使用在氧化 (RuIr/TiO) 上支的RuIr合金.
- 与商业催化剂相比,研究RuIr/TiO催化剂的催化性能和CO耐受性.
- 阐明负责增强催化活性和耐久性的潜在机制.
主要方法:
- 在氧化 (TiO) 的支持下合成RuIr合金纳米粒子.
- 电化学表征,包括循环电压测量和时测量,以评估HOR活性和耐用性.
- 实验性表征 (例如,X射线衍射,X射线光电子光谱) 和密度函数理论 (DFT) 计算,以分析催化剂结构和电子特性.
主要成果:
- RuIr/TiO催化剂在50mV超电位下表现出10.36A mg-1的质量活性,显著超过商业Pt/C (4.84倍).
- RuIr/TiO表现出极好的CO耐受性,在长时间电解后电流密度仅下降6.85%,低于1000ppmCO/H2,而Pt/C的下降率为27.84%.
- DFT的计算和表征表明,合金和强金属支相互作用调节Ru位点的电子结构,优化H吸附和OH结合,并促进CO氧化.
结论:
- RuIr/TiO合金催化剂对性HOR具有高效和耐用性.
- 合金化Ru与Ir以及与TiO强烈的金属支相互作用是提高催化活性和CO耐受性的关键策略.
- 这项工作为开发燃料电池和其他电化学能量转换系统的先进电催化剂提供了有希望的途径.
更多相关视频
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
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
相关概念视频
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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...
Reduction of Alkenes: 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...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Catalysis
