Abstract
The combination of high specific surface area and high porosity content as diffusion routes for adsorption/desorption in monodispersed solid state mixed oxide ceramic nanosized hollow porous particles enabled high hydrogen storage capacity with promising platform for controlled gas molecules delivery. The synthesized thin-walled nanoparticles were characterized for crystallinity, bond structure, morphology, and surface activity/adsorption profiles. The optimum molar ratio mixture of equal parts ceria and germania in hollow porous nanoparticles stored up to 7.8 wt% with specific surface area near 6100 m2/g and about 2 cm3/g volume content of 2.9 Å pores. The maximum discharge capacity of ∼5600 mAh/g after 12 cycles of this mesoporous structure provided a considerable storage performance and reversibility at ambient conditions. The structure dependency of storage was attributed to structural characteristics in CeO4 - GeO6 polyhedras and alterations between oxidation states in ceria.
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