Low-Temperature Reversible Hydrogen Storage Properties of LiBH4: A Synergetic Effect of Nanoconfinement and Nanocatalysis

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• 作者：Jie Shao ; Xuezhang Xiao ; Xiulin Fan ; Liuting Zhang ; Shouquan Li ; Hongwei Ge ; Qidong Wang ; Lixin Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 29, 2014
• 年：2014
• 卷：118
• 期：21
• 页码：11252-11260
• 全文大小：549K
• 年卷期：v.118,no.21(May 29, 2014)
• ISSN：1932-7455

文摘

LiBH₄ has been loaded into a highly ordered mesoporous carbon scaffold containing dispersed NbF₅ nanoparticles to investigate the possible synergetic effect of nanoconfinement and nanocatalysis on the reversible hydrogen storage performance of LiBH₄. A careful study shows that the onset desorption temperature for nanoconfined LiBH₄@MC-NbF₅ system is reduced to 150 掳C, 225 掳C lower than that of the bulk LiBH₄. The activation energy of hydrogen desorption is reduced from 189.4 kJ mol^鈥? for bulk LiBH₄ to 97.8 kJ mol^鈥? for LiBH₄@MC-NbF₅ sample. Furthermore, rehydrogenation of LiBH₄ is achieved under mild conditions (200 掳C and 60 bar of H₂). These results are attributed to the active Nb-containing species (NbH_x and NbB₂) and the function of F anions as well as the nanosized particles of LiBH₄ and high specific surface area of the MC scaffold. The combination of nanoconfinement and nanocatalysis may develop to become an important strategy within the nanotechnology for improving reversible hydrogen storage properties of various complex hydrides.