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易倍体育官网:近期,易倍体育官网-教师张刘挺等在《Journal of Materials Chemistry A》上发表研究成果

发布时间:2017-02-24动态浏览次数:144

    近期,易倍体育官网-教师张刘挺等的“Enhanced hydrogen storage properties of MgH2with numerous hydrogen diffusion channelsprovided by Na2Ti3O7 nanotubes”研究成果在《Journal of Materials Chemistry A》上发表。

论文简介如下:

    Na2Ti3O7 nanotubes (NTs) with a uniform diameter of 10 nm and Na2Ti3O7 nanorods (NRs) with a diameterof 100–500 nm were synthesized via a hydrothermal method and a solid-state method, respectively, andthen introduced into MgH2 by ball milling to catalyze the hydrogenation/dehydrogenationprocess. TheMgH2–Na2Ti3O7 NT and MgH2–Na2Ti3O7 NR composites can desorb 6.5 wt% H2 within 6 min and 16min at 300 C, respectively, while the bulk MgH2 hardly releases any hydrogen even over a much longertime. In addition, isothermal rehydrogenation measurements show that the MgH2–Na2Ti3O7 NTcomposite can absorb 6.0 wt% H2 within 60 s at 275 C and can even absorb 1.5 wt% H2 within 30 minat a temperature as low as 50 C. TEM and HRTEM analyses indicatethat the Na2Ti3O7 NTs arehomogeneously distributed in MgH2, which catalyze the de-/rehydrogenation of MgH2 and meanwhileoffer numerous diffusion channels to significantly accelerate the transportation of hydrogen atoms.Moreover, compared with bulk MgH2 and the MgH2–Na2Ti3O7 NR composite, the activation energy ofthe MgH2–Na2Ti3O7 NT composite is significantly decreased to 70.43 kJ mol1. Such Na2Ti3O7 NTs witha unique morphology of the catalyst being distributed as nanotubes in MgH2 are believed to pave theway for the future design of hydrogen storage materials with excellent hydrogen storage performances.

本网全文下载:pubs.rsc.org/en/content/articlelanding/2017/ta/c7ta00566k#!divAbstract

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