• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Surfaces and Interfaces in Nanostructured Materials and Trends in LIGA, Miniaturization, and Nanoscale Materials; 20040314-20040318; Charlotte,NC; US >Hydrogen storage properties of multiwall carbon nanotubes grown in oxygen added PECVD
【24h】

Hydrogen storage properties of multiwall carbon nanotubes grown in oxygen added PECVD

机译：增氧PECVD法生长多壁碳纳米管的储氢性能

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hydrogen storage properties of the two kinds of multiwall carbon nanotubes (MWNTs) synthesized by microwave PECVD were evaluated. The first sample grown in CH_4/H_2 reaction gas was curly shaped nanotubes with blocked nanoholes and closed caps and the next sample grown in CH_4/H_2/O_2 reaction gas had less defective structure with connected holes and open caps. The hydrogen storage properties of the carbon nanotubes with these closed and open structures were compared by thermal desorption technique. Though the MWNTs with blocked and closed structure had two different desorption ranges such as 290-330 and about 420 K and evolved about 0.64 and 0.03 wt% of hydrogen respectively, the MWNTs with open structure evolved about 1.94 wt% of hydrogen at ambient temperature. The hydrogen desorption activation energy was also calculated. The obtained hydrogen desorption activation energy of MWNTs with closed and open structure at ambient temperature was -18.5 kj/mol H_2 and -16.5 kJ/mol H_2, respectively. The activation energy of high temperature hydrogen desorption in MWNTs with closed structure was -124.4 kJ/mol H_2. The hydrogen desorbed between 290 and 330 K was the hydrogen physi-sorbed in nano-hole and the hydrogen desorbed at about 420 K was that chemi-sorbed in defects of nanotubes.
机译：评价了微波PECVD法合成的两种多壁碳纳米管的储氢性能。在CH_4 / H_2反应气体中生长的第一个样品是卷曲的纳米管，具有封闭的纳米孔和封闭的帽，在CH_4 / H_2 / O_2反应气体中生长的下一个样品具有较少的缺陷结构，具有连接的孔和开放的帽。通过热脱附技术比较了具有封闭和开放结构的碳纳米管的储氢性能。尽管具有封闭和封闭结构的MWNT具有两个不同的解吸范围，例如290-330和约420 K，并且分别释放出约0.64和0.03wt％的氢，但是具有开放结构的MWNT在环境温度下释放出约1.94wt％的氢。还计算了氢解吸活化能。在室温下，封闭结构和开放结构的多壁碳纳米管的氢解吸活化能分别为-18.5 kj / mol H_2和-16.5 kJ / mol H_2。密闭结构多壁碳纳米管中高温氢解吸的活化能为-124.4 kJ / mol H_2。在290至330 K之间解吸的氢是物理吸附在纳米孔中的氢，在420 K左右解吸的氢是化学吸附在纳米管缺陷中的氢。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号