All layered iron vanadate (FeV3O9.2.1H2O) as electrode for symmetric supercapacitor application in aqueous electrolyte

Abstract

Iron vanadate (FeV3O9.2.6H2O) which belongs to a group of transition metal vanadates with characteristics of relatively large working potential window, multiple electrochemical reactions, which gives it high spe-cific capacitance, makes them promising electrode material for supercapacitor application. In this report, we synthesized layer structured FeV3O9.2.1 H2O (FVO), with lesser water content via sol-gel method. Our FVO material demonstrated excellent electrochemical activities as both positive and negative electrodes in three-electrode system using aqueous electrolyte with specific capacitance of 73 F g-1 and 291 F g-1, re-spectively. Additionally, we employed FVO in two-electrode symmetry system where FVO electrode serves as both anode and cathode. It exhibited high capacitance of 83 Fg-1 with 92% initial capacitance retention after 6000 cycles, and high energy density of 36 Wh kg-1.(c) 2022 Elsevier B.V. All rights reserved.