Effect of Graphene Content on the Corrosion Resistance and Hydrogen Adsorption-desorption Properties of the Vanadium-based Hydrogen Storage Battery

The microstructure,phase composition,corrosion resistance,hydrogen adsorption and desorption properties of the VTiNi vanadium-based hydrogen storage battery added with various contents of graphene were tested and analyzed in this paper. The results show that the graphene could significantly improve the corrosion resistance,hydrogen adsorption and desorption properties of the vanadium-based hydrogen storage battery. With increasing the graphene content,the corrosion potential of the vanadiumbased hydrogen storage battery first positively then negatively shifted,the maximum hydrogen adsorption content first increased then decreased,and the time for hydrogen adsorption to saturation first decreased then increased with the platform pressure of hydrogen desorption first basically unchanged then increased.With 1% of the optimum graphene content for the vanadium-based hydrogen storage battery,the corrosion potential positively shifted by 414 mV,the maximum hydrogen adsorption content increased by 24%,and the time for hydrogen adsorption to saturation decreased by 44%,respectively compared to that of the battery without adding graphene.