A study on electrochemical hydrogen storage properties of truncated octahedron cobalt cerium molybdate nanocrystals synthesized by solution combustion method

Abstract

Hydrogen energy is a key role in novel renewable energy production/consumption technologies. Traditional hydrogen energy systems are suffered from low density, high production cost, low efficiency, and storage complications. With the advent of solid-state hydrogen storage technology, many of above shortcomings are fulfilled, however, there are several unknown points, particularly in mixed metal oxides, which need more attention. Herein, we report the production of an engineered truncated octahedron shaped nanocrystal containing cobalt (Co), cerium (Ce), and Molybdenum (Mo) ions, emphasizing the general formula CoCe2(MoO4)4 via a solution combustion method. Experimental observations reveal that the CoCe2(MoO4)4 nanocrystals are purely formed in maltose at 700 °C, with almost regular truncated octahedron morphology, having an octahedral edge-size of around 45 nm. This morphological arrangement exhibits significantly an enhanced electrochemical hydrogen storage performance, in an alkaline medium, with maximum discharge capacity of ~4750 mAh/g.