...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Surface properties of V_(40)(TiCr)_(51)Fe_8Mn alloy duringhydrogenation/dehydrogenation cycles
【24h】

Surface properties of V_(40)(TiCr)_(51)Fe_8Mn alloy duringhydrogenation/dehydrogenation cycles

机译：V_（40）（TiCr）_（51）Fe_8Mn合金在加氢/脱氢循环过程中的表面性能

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

The bcc alloy V_(40)(TiCr)_(51)Fe_8Mn shows a high reversible hydrogen capacity of 2.22 mass% at room temperature and is therefore expected to be applied as a hydrogen storage material. During the first 10 hydrogenation/dehydrogenation cycles, the capacity decreases markedly from 2.22 to 1.86 mass%. Possible reasons are both internal (including lattice variation, strain, phase transformation, phase disproportion, etc.) and external factors (poisoning by impurities in the gas after decades of cycles mainly).In this work, the surface properties of the V_(40)(TiCr)_(51)Fe_8Mn alloy during 20 hydrogenation/dehydrogenation cycles were investigated by XPS analysis. During hydrogenation/dehydrogenation cycles, the surface becomes oxidized. Particular oxides were known to block hydrogen uptake and might thus be responsible for the capacity decay. It was found that Cr is enriched at the surface. Dense and passive chro-mia forms thereafter around alloy particles and hinder further oxidation and therefore stops further degradation of the hydrogen capacity of the alloy.
机译：bcc合金V_（40）（TiCr）_（51）Fe_8Mn在室温下显示出2.22质量％的高可逆氢容量，因此有望用作储氢材料。在前10个氢化/脱氢循环中，容量从2.22质量％显着降低至1.86质量％。可能的原因既有内部因素（包括晶格变化，应变，相变，相错位等），也有外部因素（主要是经过几十个循环后气体中的杂质会中毒）。在这项工作中，V_（40通过XPS分析研究了（TiCr）_（51）Fe_8Mn合金在20个加氢/脱氢循环中的作用。在氢化/脱氢循环期间，表面被氧化。已知特定的氧化物会阻止氢的吸收，因此可能导致容量下降。发现Cr在表面富集。此后，在合金颗粒周围形成致密的和被动的色差，阻碍了进一步的氧化，因此阻止了合金的氢容量的进一步降低。

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