Effect of variation of metals in quaternary metal oxide based electrodes on carbon fiber for super capacitor application

[Display omitted] •Quaternary Metal Oxides were directly grown over carbon fiber substrate via simple hydrothermal approach.•While fabricating the Battery Supercapacitor Hybrid device effects of various metals and metal ratios were observed.•NiCoMoAgOx nanostructure based electrode exhibits high specific capacitance of 530 Fg−1 at current density of 1 Ag−1.•The fabricated BSH composed of the Ni-Co-Mo-Ag oxide positive electrode and activated carbon negative electrode showed capacitance 126 Fg−1 at current density of 1 Ag−1 with a potential window of 0.4–0.5 V and 97 % capacitance retention after 300 charge /discharge cycles.•The resulting materials have tremendous potential to be used as electrodes for flexible supercapacitor. The objective of the present study is to explore novel, cost-effective, environmental friendly electrode materials with enhanced supercapacitor performance. Cobalt and nickel oxide based materials have been widely used for supercapacitor applications. In this work, Nickel-Cobalt-Molybdenum in combination with another metal of group (Ag, Mn, Cu), based quaternary metal oxide (QMO), were directly grown over a carbon fiber via a simple hydrothermal route. Hierarchical 3-D nanostructures of QMOs were synthesized over carbon fiber and characterized to investigate the effect of different metals over electrochemical performance. The Nickel-Cobalt-Molybdenum-Silver oxide electrode attained the best electrocapacitive performance of 530 Fg−1 at current density of 1 Ag−1 owing to its unique structure and high surface area. The fabricated supercapacitor hybrid device composed of the Ni-Co-Mo-Ag oxide positive electrode and activated carbon negative electrode showed capacitance 126 Fg−1 at current density of 1 Ag−1 with a potential window of 0.4–0.5 V and the 97 % capacitance retention. This facile synthesis of novel quaternary metal oxides provides new possibilities for making flexible energy storage devices with higher electro capacitive ability.