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To reveal the synergistic effect of nanoconfinement and metallic catalysis on the hydrogen storage properties of LiBH 4 , the nanoporous Ni-based alloy (np-Ni) was prepared herein by dealloying of the Mn 70 Ni 30  alloy in (NH 4 ) 2 SO 4  solution, and then LiBH 4  was loaded into np-Ni to construct the LiBH 4 /np-Ni hydrogen storage system using wet impregnation. It was found that dehydrogenation of the LiBH 4 /np-Ni (1:5) system starts at around 70°C and ends before 400°C, with ~11.9 wt.% of hydrogen desorbed. The apparent dehydrogenation activation energy for the LiBH 4 /np-Ni (1:5) system was remarkable decreased to about 11.4 kJ/mol. After rehydrogenation at 450°C under 8 MPa hydrogen pressure, ~8.2 wt.% of hydrogen can be released from about 60°C upon second dehydrogenation. These obtained results would provide an efficient strategy for improving the hydrogen storage properties of other metal borohydrides.

Enhanced Low-Temperature Hydrogen Storage in Nanoporous Ni-Based Alloy Supported LiBH4