减轻O中间体的吸附强度超过PdRhCu三极金属通过联结体效应用于实际PEMFC中的增强氧气减少
Shuya Xu1, Luping Zhang1, Yunyi Zhang1
1School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
The journal of physical chemistry letters
|February 17, 2025
概括
这项研究引入了一种新型的 - - 铜 (PdRhCu) 金属催化剂,可显著增强质子交换膜燃料电池 (PEMFC) 的氧降解反应 (ORR) 动力学. 新的催化剂提供了卓越的活性和耐用性,克服了CO中毒问题.
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:
- 质子交换膜燃料电池 (PEMFC) 对于清洁能源至关重要,但它们的商业化受到酸氧还原反应 (ORR) 缓慢动力学的限制.
- 基于的纳米材料虽然对ORR充满希望,但由于优化表面吸附的挑战,它们的内在活性较低,并且受到CO中毒.
- 开发高效和稳定的电催化剂对于推进PEMFC技术至关重要.
研究的目的:
- 开发一种超薄的PdRhCu三元金属催化剂,以促进PEMFC中的酸性ORR.
- 调查 Cu 加入增强催化活性和稳定性的机制.
- 为了证明这个新的催化剂在一个功能性的PEMFC中的潜力.
主要方法:
- 合成超薄的PdRhCu三元金属.
- 电化学表征包括循环电压测量和旋转磁盘电极测量.
- 燃料电池性能测试和稳定性评估.
主要成果:
- 该PdRhCu金属烯表现出显著改善的ORR性能,具有0.93V的高半波潜力.
- 催化剂表现出极高的稳定性,在10,000个循环后的活性衰变是可以忽略不计的,并且具有卓越的抗CO中毒能力.
- 用PdRhCu金属组装的PEMFC实现了最大功率密度为820 mW cm-2的高电催化稳定性.
结论:
- 在PdRh合金中加入Cu有效地向下移动d频段中心,削弱中间吸附和降低ORR能量障碍.
- PdRhCu金属代表了酸性ORR电催化剂设计的重大进步.
- 这项工作为通过工程金属电催化剂实际实施PEMFC铺平了道路.
更多相关视频
相关概念视频
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
02:17Reduction 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
02:24Reduction 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
01:22Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
1.8K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.8K