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首页> 外文期刊>Journal of nanomaterials >Characterization and Hydrogen Storage of Surface-Modified Multiwalled Carbon Nanotubes for Fuel Cell Application
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Characterization and Hydrogen Storage of Surface-Modified Multiwalled Carbon Nanotubes for Fuel Cell Application

机译：用于燃料电池的表面改性多壁碳纳米管的表征和储氢

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The synthesis, identification, and H2storage of multiwalled carbon nanotubes (MWCNTs) have been investigated in the present work. MWCNTs were produced from the catalytic-assembly solvent (benzene)-thermal (solvothermal) route. Reduction of C6Cl6with metallic potassium was carried out in the presence of Co/Ni catalyst precursors at 503–623 K for 12 h. XRD patterns indicated that the abstraction of Cl from hexachlorobenzene and the formation of KCl precipitates were involved in the early stage of the synthesis process of MWCNTs. This result offers further explanation for the formation of MWCNT structure and yield using the solvothermal route depending on the Co/Ni catalyst precursors. The diameter of MWCNTs ranged between 30 and 100 nm and the H2storage capacity of MWCNTs improved when 2.7–3.8 wt% Pd or NaAlH4were doped. The XANES/EXAFS spectra revealed that the Co/Ni catalyst precursors of the MWCNT synthesis were in metallic form and Pd atoms possessed a Pd–Pd bond distance of 2.78 Å with a coordination number of 9.08. Ti-NaAlH4or Pd nanoparticles were dispersed on MWCNTs and facilitated to improve the H2storage capacity significantly with the surface modification process.
机译：在本工作中，已经研究了多壁碳纳米管（MWCNT）的合成，鉴定和H2存储。 MWCNT由催化组装溶剂（苯）-热（溶剂热）路线生产。在Co / Ni催化剂前体存在下，在503–623 K下用金属钾还原C6Cl6 12 h。 XRD图谱表明，六氯苯中Cl的提取和KCl沉淀的形成与MWCNTs合成过程的早期有关。该结果为使用溶剂热途径取决于Co / Ni催化剂前体的MWCNT结构的形成和产率提供了进一步的解释。掺杂2.7–3.8％wt％的Pd或NaAlH4后，MWCNT的直径在30至100nm之间，并且H2的储氢能力得到了改善。 XANES / EXAFS光谱表明，MWCNT合成的Co / Ni催化剂前体为金属形式，Pd原子的Pd-Pd键距为2.78Å，配位数为9.08。 Ti-NaAlH4或Pd纳米颗粒分散在MWCNTs上，并通过表面改性工艺促进了H2储氢能力的显着提高。

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