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分享一篇Nano Letters 燃料電池的最新文章
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康奈爾大學(xué)通過(guò)三維的顯微鏡，研究了燃料電池中Pt納米顆粒的變化過(guò)程，發(fā)現(xiàn)coalescence是導(dǎo)致電池性能衰減的重要原因。文章的新穎之處在于，用TEM的銅網(wǎng)做了電極，所以可以看到一個(gè)電化學(xué)反應(yīng)前后的產(chǎn)物對(duì)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樓2012-01-18 05:47:20
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還有另外一篇，大家可以一起參考一下。 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 |
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