Nanostructured carbons modified with nickel as potential novel reversible hydrogen storage materials: Effects of nickel particle size

LENER, G.; CHANQUÍA, C.; EIMER, G.A.; GARCÍA BLANCO, A.A.; AMAYA-RONCANCIO, S.; OLIVA, M.I.; CARRARO, P.M.; BARRERA, D.; TROIANI, H.

MICROPOROUS AND MESOPOROUS MATERIALS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018 vol. 273 p. 50 - 59

1387-1811

In this study, ordered mesoporous carbons CMK-3 were prepared by a nanocasting method using SBA-15 silica astemplate and sucrose as carbon source. The pure CMK-3 was modified with nickel by wet impregnation methodand the effects on hydrogen storage capacity were studied at different pressures and temperatures. The struc-tural, textural and chemical properties were evaluated in order to investigate their correlation with hydrogenadsorption properties. Also, computational methods (DFT) contributed to the understanding of hydrogen storageinteractions in the Ni/C samples.Two different behaviors on the hydrogen adsorption were obtained after reduction treatment under H2at-mosphere. For the unreduced samples at 77 K, the textural properties were the determining factor in the H2storage capacity. On the other hand, for the reduced samples at room temperatures, the presence of nickelnanoparticles increased the hydrogen adsorption, with a possible dependence of the particle size