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含有的碳封装白金电催化剂,由单壁碳纳米管支持,用于聚合物电解质燃料电池

Qiao Chen¹, Chu-Yang Yu¹, Yong-Chang Zhai²

¹Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan.

|April 14, 2025

概括

在单壁碳纳米管上的含碳外中封装的白金催化剂显著提高了燃料电池的耐用性. 这种增强的催化剂结构克服了聚合物电解质燃料电池氧降解反应中的稳定性问题.

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:

基于 (Pt) 的电催化剂对于聚合物电解质燃料电池 (PEFC) 中的氧降解反应 (ORR) 是必不可少的.
限制PEFC性能的一个关键挑战是传统Pt电催化剂的稳定性差.
开发强大的催化剂支对于提高催化剂耐用性和燃料电池整体效率至关重要.

研究的目的:

合成一种新的Pt电催化剂,在PEFC中增强ORR稳定性.
研究含的碳外和单壁碳纳米管 (SWCNT) 支对催化剂性能和耐用性的影响.
评估膜电极组件 (MEA) 中开发的催化剂的电催化活性和稳定性.

主要方法:

使用增强的直接注射热解合成 (e-DIPS) 方法制造高晶度,高纯度的SWCNT.
对SWCNT进行处理,以产生含的SWCNT (N-SWCNT).
通过易溶液等离子体 (SP) 方法在N-SWCNT (Pt/N-SWCNT) 上封装在无形碳外中的Pt电催化剂的合成.
使用高分辨率传输电子显微镜 (HRTEM) 进行表征.
在单细胞MEA中测试催化剂的性能和耐用性,包括加速耐用性测试 (ADT) 和高压应力测试.

主要成果:

HRTEM证实Pt纳米颗粒有效地被封装在N-SWCNT的含碳外中.
Pt/N-SWCNT-MEA表现出优越的耐用性,在16000个ADT周期后,最大功率密度仅下降20.8%.
在高压后的应力 (1.0-1.5V) 后,Pt/N-SWCNT-MEA的功率密度损失 (39.5%) 与Pt/SWCNT-MEA (48.3%) 和商业Pt/C (93.2%) 相比显著较低.

结论:

含的无形碳外有效地保护Pt纳米粒子,增强催化剂的稳定性.
N-SWCNTs作为一个强大的支持,有助于改善电化学性能和催化剂的耐用性.
开发的Pt/N-SWCNT催化剂由于其增强的活性和稳定性,在PEFC中具有很好的实际应用潜力.

关键词:

碳纳米管是如何使用的燃料电池是指燃料电池的使用方式.氧降解反应反应的氧降解反应金金金是什么意思溶液等离子体溶液中的血溶液.

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