The study of electrochemical behavior of cobalt doped ZnMoO₄ as an electrode material for energy storage applications

Transition metal molybdates based electrode material were widely investigated in research, recently. Among them, the exploration of ZnMoO₄ as an electrode material was limited due to its poor electrical conductivity and formation of bulkier morphology during the synthesis is the major barrier for its application in supercapacitor, despite of its low cost and Eco friendliness. In this work, we have synthesized Cobalt doped ZnMoO₄ as an electrode material and analyzed its electrochemical performance. Different concentration (0.1 mMol to 0.4 mMol) of cobalt was doped with ZnMoO₄ and studied its electrochemical behavior using Cyclic Voltammetry (CV), Galvanostatic charge–discharge (GCD), Electrochemical Impedence analysis (EIS) and stability studies. These results reveal that cobalt doping greatly helps in improving the conductivity of ZMO and delivered very high specific capacitance value of 253 F g⁻¹ at 1 A g⁻¹ compared to that of bare ZMO by reducing the particle size to nanoscales. In addition, CZMO-3 has delivered excellent stability with better capacitance retention as 87% after 14,000 cycles. Also, the symmetric capacitor device fabricated with CZMO-3 has exhibited 86% of capacitance retention after 1000 cycles of charge–discharge studies. These results shows the potential application of CZMO-3 as an electrode material for energy storage applications.