| 查看: 1895 | 回复: 9 | |||
| 【奖励】 本帖被评价8次，作者isoglucose增加金币 6 个 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[资源]
分享一篇Nano Letters 燃料电池的最新文章
|
|||
|
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 ] |
回复此楼» 收录本帖的淘帖专辑推荐
 宝贝 |
» 猜你喜欢
关于碳量子点抗菌的研究
已经有15人回复
-
南大化学调剂
已经有11人回复
-
分析化学论文润色/翻译怎么收费?
已经有182人回复
-
硫酸钠溶液浓度与密度曲线
已经有0人回复
-
0703调剂
已经有4人回复
-
1
已经有21人回复
-
0703 调剂
已经有5人回复
-
招收
已经有0人回复
-
西南某211招27届博士
已经有30人回复
-
大连工业杰青/长江团队-生物质材料-储能电池方向招收2026级博士生
已经有0人回复
» 本主题相关商家推荐: (我也要在这里推广)
» 本主题相关价值贴推荐，对您同样有帮助:
- Nature materials 固体氧化物燃料电池电极材料新文章
已经有147人回复
- 微米纳米版2011年7月--12月资源帖汇总
已经有9人回复
- 2008年nature 上由M.Armand和J.-M.Tarascon写的一篇关于锂电池方面的综述
已经有47人回复
- 微生物燃料电池相关文章
已经有24人回复
- 微纳版九月份活动贴和资源帖汇总——期待大家的参与与分享
已经有87人回复
- 虫友有福了：JACS 2010年太阳能电池/燃料电池/锂电池相关文献全下载
已经有139人回复
- 【分享】德美研发出氢燃料电池新型催化剂
已经有4人回复
9楼2012-02-17 14:19:26
★★★★★ 五星级,优秀推荐
|
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
7楼2012-01-18 05:47:20
