Hybrid Veil-Like Co(OH)₂/rGO Nanocomposites Towards Electrochemical Hydrogen Storage Properties

Abstract

The design and synthesis of new hydrogen storage nanomaterials with high capacity at low cost is extremely desirable but remains challenging for today's development of a hydrogen economy. As a new type hydrogen storage material, Co(OH) 2 /rGO nanocomposites were successfully obtained through a facile method in this study. Through the measurements of X-ray di®raction, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry and galvanostatic charge/discharge, it indicated that Co (OH) 2 /rGO nanocomposites showed a veil-like microstructure, consisting of interlaced nanorods with a diameter of 4-8 nm on rGO nanosheets. The hydrogen storage capacity was up to 400 mAh/g at room temperature, higher than those of graphene and Co(OH) 2 .

Electrochemical Hydrogen Storage Materials: State-of-the-Art and Future Perspectives

“…The composites of graphene and metal compounds have excellent electrochemical hydrogen storage capacity, including oxides ZrO 2 , Al 2 O 3 , TiO 2 , hydroxides Co­(OH) 2 , chalcogenides Co 9 S 8 , and composite oxides Zn 2 GeO 4 , Cd 2 SiO 4 , Co 2 SnO 4 , and CdSnO 3 . Nanocomposites with good specific surface area and porosity are viable materials for sustainable hydrogen storage.…”