AUTHOR=Chen Xi , Li Zhao , Zhang Yue , Liu Dongming , Wang Chunyang , Li Yongtao , Si Tingzhi , Zhang Qingan 

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

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00283

DOI=10.3389/fchem.2020.00283

ISSN=2296-2646

ABSTRACT=<p>To reveal the synergistic effect of nanoconfinement and metallic catalysis on the hydrogen storage properties of LiBH<sub>4</sub>, the nanoporous Ni-based alloy (np-Ni) was prepared herein by dealloying of the Mn<sub>70</sub>Ni<sub>30</sub> alloy in (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> solution, and then LiBH<sub>4</sub> was loaded into np-Ni to construct the LiBH<sub>4</sub>/np-Ni hydrogen storage system using wet impregnation. It was found that dehydrogenation of the LiBH<sub>4</sub>/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<sub>4</sub>/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.</p>