SWNT-MWNT hybrid architecture for proton exchange membrane fuel cell cathodes
SWNT-MWNT hybrid architecture for proton exchange membrane fuel cell cathodes
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DOI：
10.1021/jp711280j
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发表时间：
2008-06-19
影响因子：
3.7
通讯作者：
Haddon, Robert C.
中科院分区：
文献类型：
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作者：
Ramesh, Palanisamy;Itkis, Mikhail E.;Haddon, Robert C.
将单壁碳纳米管（SWNTs）和SWNT-多壁碳纳米管（MWNT）杂化物负载Pt薄膜作为质子交换膜燃料电池的阴极催化层进行了研究。单壁碳纳米管薄膜的最佳Pt负载量和厚度分别为20-100 μ g Pt/cm（2）和0.3-1.4 μ m。在此最佳范围内，Pt-SWNT薄膜显示出优异的质子传导性，并且能够在催化剂层中没有额外的nation的情况下达到峰值性能。阴极特定的质量活性的Pt的单壁碳纳米管支持被发现减少的Pt负载量和厚度的增加，由于传质的限制。添加Pt-MWNTs的Pt-SWNT薄膜被发现增加的质量传输特性和阴极比质量活性。在大约相同的功率输出下，SWNT-MWNT混合载体显示出比SWNT载体高三倍的质量活性，并且发现最佳混合物是由20-30 μ gPt/cm（2）在SWNT上和5-10 μ gPt/cm（2）在MWNT上组成的混合物。
A thin film of single-wall carbon nanotubes (SWNTs) and SWNT-multiwall carbon nanotube (MWNT) hybrids loaded with Pt have been evaluated as the cathode catalyst layer in proton exchange membrane fuel cells. The optimum Pt loading and thickness for SWNT films is found to be in the range of 20-100 mu g Pt/cm(2) and 0.3-1.4 mu m, respectively. In this optimum range, Pt-SWNT thin films show excellent proton conductivity and are able to reach peak performance without additional nation in the catalyst layer. Cathode-specific mass activity of Pt on a SWNT support is found to decrease as the Pt loading and thickness increase due to mass transfer limitations. Addition of Pt-MWNTs to Pt-SWNT thin films is found to increase the mass transport characteristics and cathode-specific mass activity. A SWNT-MWNT hybrid support shows three times higher mass activity than a SWNT support at about the same power output, and the optimum hybrid is found for a blend composed of 20-30 mu gPt/cm(2) on SWNTs and 5-10 mu gPt/cm(2) on MWNTs.