Effect of pore morphology of mesoporous carbons on the electrocatalytic activity of Pt nanoparticles for fuel cell reactions
Effect of pore morphology of mesoporous carbons on the electrocatalytic activity of Pt nanoparticles for fuel cell reactions
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DOI：
10.1016/j.apcatb.2010.05.021
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发表时间：
2010-08
影响因子：
22.1
通讯作者：
Shuqin Song;Yeru Liang;Zhenghui Li;Yi Wang;R. Fu;Dingcai Wu;P. Tsiakaras
中科院分区：
文献类型：
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作者：
Shuqin Song;Yeru Liang;Zhenghui Li;Yi Wang;R. Fu;Dingcai Wu;P. Tsiakaras
以有序介孔碳CMK-3和无序蠕虫孔状介孔碳（WMC）为载体材料，研究了介孔碳的孔形貌对Pt纳米粒子燃料电池电催化活性的影响。两种材料具有非常相似的孔特性（孔体积，BET表面积，中孔尺寸），除了孔形态。已经发现，CMK-3可以提供具有更多电化学活性Pt位点和更高电化学表面积的Pt纳米颗粒，因此，与Pt/WMC相比，Pt/CMK-3表现出上级燃料电池反应活性，特别是在液体反应物（例如乙醇）的情况下。这可以归因于通过CMK-3载体的更容易的质量传输，其得益于其六边形排列的碳纳米棒（即中孔）的纳米间距的高有序度和非常好的3D互连，从而导致Pt纳米颗粒的更易接近性。上述结果表明，碳载体的孔形态在其负载的Pt纳米颗粒的电催化活性中起决定性作用，尽管其他结构参数如孔径非常相似。
In the present investigation, the role of the pore morphology of mesoporous carbons in the electrocatalytic activity of Pt nanoparticles for fuel cell reactions has been successfully revealed by adopting ordered mesoporous carbon CMK-3 and disordered wormhole-like mesoporous carbon (WMC) as the support material, respectively. Both materials possess very similar pore characteristics (pore volume, BET surface area, mesopore size) except pore morphology. It has been found that CMK-3 can provide Pt nanoparticles with more electrochemically active Pt sites and higher electrochemical surface area, and thus, Pt/CMK-3 exhibits superior fuel cell reactions activity compared to Pt/WMC, especially in the case of liquid reactants (e.g. ethanol). This could be attributed to the much easier mass transportation through CMK-3 support profiting from both the high ordered degree and the very good 3D interconnection of the nano-spacings of their hexagonally arrayed carbon nanorods (i.e. mesopores), thus leading to more accessibility of Pt nanoparticles. The above results demonstrates that the pore morphology of carbon supports plays a decisive role in the electrocatalytic activity of their supported Pt nanoparticles, although other structure parameters like pore size are very similar.