Auto-combustion synthesis, structural analysis, and electrochemical solid-state hydrogen storage performance of strontium cobalt oxide nanostructures.

Hydrogen storage in transition mixed metal oxides (MMOs) are predicted from their tendency for adsorption-desorption hydrogen. Hydrogen itself requires initial forces pressure for initiation of condensation. MMOs, based on their effective immobilization matrices, are potential nanocatalysts for energy storage. Even various materials are highlighted for hydrogen storage; however, their adsorption capacities are insufficient for real applications. Here we report, for the first time, a novel hydrogen storage MMOs (Sr 2 Co 9 O 14 nanoparticles) potential for physical hydrogen sorption, containing a redox species. This polycrystalline nanoparticle is prepared via a combustion method in the presence of various fuels like glucose, fructose, sucrose, lactose, and maltose. The glucose supports the pure and homogenous formation of Sr 2 Co 9 O 14 nanoparticles consisting the particles less than 100 nm. Interestingly, a maximum discharge capacity of around 950 mA h/g at room temperature has recorded; emphasizing Sr 2 Co 9 O 14 nanoparticles is a potential substrate for hydrogen storage. • Auto-combustion utilize for production of Sr 2 Co 9 O 14 nanostructures. • Variation of reducing agents foster particles formation. • Polycrystalline Sr 2 Co 9 O 14 nanostructures well growth in glucose. • A mixed conductive matrix, and crystalline texture support hydrogen storage ability. • Presence of redox species in structure enhance hydrogen discharge properties. [ABSTRACT FROM AUTHOR]