摘要： With the aid of supercritical CO 2 , Fe-, Ni-, Pd-, and Au-nanoparticle-decorated nanostructured carbon materials (graphene, activated carbon, carbon black, and carbon nanotubes) are synthesized for catalyzing the dehydrogenation of LiAlH 4 . The effects of the metal nanoparticle size and distribution, and the type of carbon structure on the hydrogen release properties are investigated. The Fe/graphene nanocomposite, which consists of ∼2 nm Fe particles highly dispersed on graphene nanosheets, exhibits the highest catalytic performance. With this nanocomposite, the initial dehydrogenation temperature can be lowered (from ∼135 °C for pristine LiAlH 4 ) to ∼40 °C without altering the reaction route (confirmed by in situ X-ray diffraction), and 4.5 wt% H 2 can be released at 100 °C within 6 min, which is faster by more than 135-fold than the time required to release the same amount of H 2 from pristine LiAlH 4 . With the aid of supercritical CO 2 , the synthesized Fe/graphene nanocomposite exhibits superior catalytic activity for the dehydrogenation of complex hydrides. 出版日期： 2014-10-09 識別號： ISSN: 2040-3364 識別號： EISSN: 2040-3372 識別號： DOI: 10.1039/c4nr03357d
