通过氨基分子接口介导的金属电催化剂打破氧气减少的缩放关系
Shuya Xu1, Yunyi Zhang1, Yukun Peng1
1School of Chemistry and Chemical Engineering, Nantong University Nantong 226019 China lfzhang@ntu.edu.cn litongfei@ntu.edu.cn.
Chemical science
|February 25, 2026
概括
一种新的聚乙烯胺 (PEI) 修改的- (PdRh@PEI) 催化剂显著提高了离子交换膜燃料电池 (AEMFC) 中氧降解反应 (ORR) 的效率. 这种接口工程方法提高了能应用的催化剂性能和耐用性.
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:
- 开发稳定和活跃的 (Pd) 基催化剂对于在利用中推进阳离子交换膜燃料电池 (AEMFCs) 是必不可少的.
- 氧降解反应 (ORR) 对AEMFCs至关重要,但由于缩放关系,传统途径面临效率限制.
研究的目的:
- 使用聚乙烯胺 (PEI) 介导的接口修改,为增强的ORR催化而设计一种新的基于Pd的催化剂.
- 为了研究在AEMFC中修改的PdRh金属 (PdRh@PEI) 的性能,以实现高效的能量转换.
主要方法:
- 使用聚乙烯胺 (PEI) 的PdRh金属的接口工程.
- 电催化性能评估,包括半波潜力和质量活动测量.
- 在现场振动光谱和计算调查以了解催化机制.
主要成果:
- PdRh@PEI催化剂实现了高半波潜力 (0.96 V) 和0.9 V的质量活性 (1.23 A mgPd-1),超过了基准Pt/C和其他基于Pd的催化剂.
- PEI修改促进了电子转移到PdRh,降低了d频段中心,并降低了限制速度ORR步骤的激活屏障.
- 催化剂证明了转向氧气减少 (*OOH到 *O) 的离散机制,提高了效率.
结论:
- 聚乙烯胺介导接口工程是开发高性能 Pd 基 ORR 催化剂的有效策略.
- 对于AEMFC应用,PdRh@PEI催化剂非常有前途,其功率密度 (164.3mW cm-2) 和运行耐用性 (>24小时) 都很好.
- 分子接口修改为设计用于能源转换技术的先进催化剂提供了一个强大的途径.
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