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嵌入在半孔碳纳米纤维中的碳化物与Pt之间的强烈相互作用使得持久的氧气减少成为可能

Siwen Zhou¹, Wentuan Bi², Jujia Zhang²

¹School of Materials Science and Engineering, Anhui University, Hefei, Anhui, 230601, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|April 30, 2024

概括

新的碳化纳米纤维为质子交换膜燃料电池 (PEMFC) 中的电催化剂提供了稳定,高性能的替代碳支,增强了氧降解反应 (ORR) 活性和耐用性.

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:

碳上的 (Pt) 是质子交换膜燃料电池 (PEMFC) 的标准电催化剂.
传统的碳支器在高潜力下降解,降低燃料电池性能.
开发强大的催化剂支对于推进PEMFC技术至关重要.

研究的目的:

调查嵌入在半孔碳纳米纤维 (m-TiCN NFs) 中的碳化物作为Pt电催化剂的耐用替代支.
为了评估电化学活性和稳定性 Pt 支持m-TiCN NFs 氧降解反应 (ORR).

主要方法:

在碳纳米纤维 (m-TiCN NFs) 中嵌入的半孔碳化的合成.
在m-TiCN NF支上固定纳米粒子 (Pt NPs).
用循环电压测量和电化学阻抗光谱等技术对ORR活性和耐久性Pt/m-TiCN NF进行电化学表征.
使用美国能源部 (DOE) 协议下开发的催化剂制造和测试PEMFC.

主要成果:

m-TiCN NFs在高潜力下提供了出色的稳定性,并与 Pt NPs产生强烈的相互作用.
Pt/m-TiCN NFs显著增强ORR活性和耐久性,在50,000个循环后电化学表面积 (ECSA) 损失<5%.
使用 Pt/m-TiCN NF 的 PEMFC 实现了 1.22 W cm-2 的峰值功率密度,在 DOE 协议下,在 30,000 个循环后,仅以 3% 的损失保持性能.

结论:

m-TiCN NFs是PEMFC中的Pt电催化剂的一个有希望的耐腐蚀支材料.
强大的Pt-支持相互作用和m-TiCN NF固有的稳定性导致优越的ORR性能和燃料电池耐用性.
这项工作为开发下一代电催化剂提供了可行的策略,用于高效且持久的燃料电池应用.

关键词:

碳腐蚀腐蚀的原因氧减少反应反应的氧减少反应.有孔的纳米纤维.强金属支相互作用的相互作用碳化物碳化物

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