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分享一篇Nano Letters 燃料电池的最新文章
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康奈尔大学通过三维的显微镜，研究了燃料电池中Pt纳米颗粒的变化过程，发现coalescence是导致电池性能衰减的重要原因。文章的新颖之处在于，用TEM的铜网做了电极，所以可以看到一个电化学反应前后的产物对比。 http://pubs.acs.org/doi/abs/10.1021/nl203920s Abstract We present an electron tomography method that allows for the identification of hundreds of electrocatalyst nanoparticles with one-to-one correspondence before and after electrochemical aging. This method allows us to track, in three-dimensions, the trajectories and morphologies of each Pt−Co nanocatalyst on a fuel cell carbon support. In conjunction with the use of atomic-scale electron energy loss spectroscopic imaging, our experiment enables the correlation of performance degradation of the catalyst with changes in particle/interparticle morphologies, particle−support interactions, and the near-surface chemical composition. We found that aging of the catalysts under normal fuel cell operating conditions (potential scans from +0.6 to +1.0 V for 30 000 cycles) gives rise to coarsening of the nanoparticles, mainly through coalescence, which in turn leads to the loss of performance. The observed coalescence events were found to be the result of nanoparticle migration on the carbon support during potential cycling. This method provides detailed insights into how nanocatalyst degradation occurs in proton exchange membrane fuel cells (PEMFCs) and suggests that minimization of particle movement can potentially slow down the coarsening of the particles and the corresponding performance degradation.[ Last edited by isoglucose on 2012-1-13 at 09:42 ] |
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7楼2012-01-18 05:47:20
★★★★★ 五星级,优秀推荐
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还有另外一篇，大家可以一起参考一下。 Atomic-Resolution Spectroscopic Imaging of Ensembles of Nanocatalyst Particles Across the Life of a Fuel Cell http://pubs.acs.org/doi/abs/10.1021/nl203975u |
2楼2012-01-13 13:23:35
9楼2012-02-17 14:19:26
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