Controllable synthesis of 3D NiχCo1−χ oxides with different morphologies for high-capacity supercapacitors

摘要: 3D NiχCo1−χ oxides with different morphologies for high-capacity supercapacitors were controllably synthesized via an electrodeposition method combined a simple post annealing process. The synthesis involves the co-electrodeposition of bimetallic (Ni, Co) hydroxide precursor on nickel foam scaffold and subsequent thermal transformation to oxides. crystalline structure, morphology electrochemical performance can be readily manipulated by simply varying Co/Ni molar ratio in electrolyte. With increase ratio, characteristic peak intensities signal sites gradually changed from NiO crystal dominant structure NiCo2O4 finally Co3O4 structure. Moreover, also controlled adjusting In addition, Ni0.61Co0.39 oxide electrode shows large specific capacitance 1523.0 F g−1 at 2 A 95.30% that retained, even high current density 30 g−1. superior rate capability should attributed unique network-like architecture, which enlarge liquid–solid interfacial area, facilitate electron ion transport, further utilization active material. To demonstrate its practical application, asymmetric supercapacitor based as positive activated carbon negative was fabricated. Owing outstanding capacitive behavior electrode, device delivers prominent energy 36.46 W h kg−1 power 142 kg−1, holds great promise potential applications storage.