Heat-treated multi-walled carbon nanotubes as durable supports for PEM fuel cell catalysts
Heat-treated multi-walled carbon nanotubes as durable supports for PEM fuel cell catalysts
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热处理多壁碳纳米管作为 PEM 燃料电池催化剂的耐用支撑
DOI：
10.1016/j.electacta.2011.10.031
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发表时间：
2011-12
影响因子：
6.6
通讯作者：
Mu Pan
中科院分区：
文献类型：
--
作者：
Haifeng lv;Niancai Cheng;Shichun Mu;Mu Pan
为了提高其作为质子交换膜（PEM）燃料电池催化剂载体的电化学稳定性，在氨气氛中对碳纳米管（CNT）进行热处理。采用高分辨透射电子显微镜、氮气吸附、拉曼光谱和X射线光电子能谱等手段研究了热处理后碳纳米管（H-CNTs）结构的温度效应，并通过电化学方法对其抗电化学氧化性能进行了深入研究。在氧化48小时后，与H-CNT相比，CNT上的表面氧化物的量明显高，表明H-CNT具有更高的电化学氧化抗性。Pt纳米粒子支持在碳纳米管和H-CNTs通过在乙二醇溶液中的多元醇过程制造。证明了来自热处理的Pt纳米颗粒在纳米管上的分散的改善，并且结果表明，在1000°C下加热的沉积在H-CNT上的Pt纳米颗粒是电化学可接近的。因此，它们可以用作燃料电池中Pt催化剂的耐用载体。
To improve their electrochemical stability as catalyst supports for proton exchange membrane (PEM) fuel cells, carbon nanotubes (CNTs) are heat treated in an ammonia atmosphere. High-resolution transmission electron microscopy, nitrogen adsorption, Raman spectroscopy, and X-ray photoelectron spectroscopy are employed to study the temperature effect on the structure of the heat-treated CNTs (H-CNTs), and a thorough investigation of their resistance to electrochemical oxidation is also measured by an electrochemical technique. The amount of surface oxides on the CNTs is visibly high in comparison to the H-CNTs after 48h of oxidation, indicating that the H-CNTs have a higher resistance to electrochemical oxidation. Pt nanoparticles supported on both CNTs and H-CNTs are fabricated through a polyol process in an ethylene glycol solution. The improvement of the dispersion of Pt nanoparticles on nanotubes from the heat treatment is demonstrated, and the results show that the Pt nanoparticles deposited on the H-CNTs heated at 1000°C are electrochemically accessible. Therefore, they can be used as a durable support for Pt catalysts in fuel cells.
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