Abstract
Nickel (Ni) and ceria (CeO2) nanoparticles (NPs) containing microporous and graphitic carbon nanofiber (CNF)-activated carbon microfiber (ACF)-based adsorbent was prepared as an efficient hydrogen (H2) storage material at 200 °C and 1 bar. The prepared NiCeO2-ACF/CNF was tested for the H2 storage capacity under batch (static) as well as dynamic (flow) conditions, and the amounts of H2 adsorbed were measured to be approximately the same. In its multiple roles, Ni NP served as the chemical vapor deposition catalyst to grow the CNFs on ACF, besides enhancing H2 adsorption via the spillover mechanism, and decreasing the reduction temperature of CeO2. The experimental data corroborated the positive effects of the synergistic interaction between the Ni and CeO2 NPs and the graphitic characteristics of the CNFs on H2 adsorption. Although CeO2 induced irreversibility in H2 adsorption on NiCeO2-ACF/CNF, the adsorbent was completely regenerated at 300 °C and 1 bar, indicating the developed H2 storage-regeneration process in this study to be effective, practical, and energy efficient.
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