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

Abstract

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.