NiO/ZnO Composite Derived Metal-Organic Framework as Advanced Electrode Materials for Zinc Hybrid Redox Flow Battery

NiO/ZnO composite derived metal-organic framework (MOF) is used as to modify carbon felt (CF) via a conventional solid-state reaction followed by ultrasonication. The prepared electrode material is used in zinc-hybrid redox flow batteries (RFBs) due to their high redox activity of Zn2+/Zn. The electrochemical performance of composite modified CF and pre-treated CF was studied by cyclic voltammetry (CV) in 0.5 M aqueous zinc chloride with 5 M potassium hydroxide solutions showed clear confirmation for enhanced electrocatalytic activity. The unique porous structure of NiO/ZnO-derived MOF with increased surface area improves the battery behavior significantlyThe peak current ratio for the as-prepared material is about 3 times higher than that of the pre-treated CF due to more active sites. Zinc-based RFB with modified CF electrode exhibited better electrochemical performance with voltage efficiency (VE, 88 %), which is higher than true redox flow batteries. NiO/ZnO-derived MOF composite is used to modify carbon felt electrode. Alkaline zinc-based electrolyte is used as anolyte and catholyte and exhibits better redox reactions. The peak current ratio increases to 1.07 mA at 10 mA cm-2 for the as-prepared material.image

Automated summary

NiO/ZnO composite derived MOF is used to modify carbon felt electrode, leading to enhanced electrocatalytic activity and higher voltage efficiency in alkaline zinc-based redox flow batteries.