Archive | 2021
Mesoporous Co2NiO4 nanotube arrays grown on the carbon cloth for high-performance pseudocapacitors
Abstract
Supercapacitors, known as ultra capacitors or electrochemical supercapacitors (ESCs), are considered as promising candidates for energy storage because they have the advantages of higher power densities, longer cycle lives, a short charging time, low maintenance cost, and so forth. There are mainly two kinds of supercapacitors based on the charge and discharge mechanism. The first is carbon-based materials with a large specific surface area, which charge and discharge by an electric double layer mechanism. The second is pseudocapacitance materials (transition metal oxides and conductive polymers), where the charging and discharging is based on the redox reaction of the active materials. Graphene has attracted the most attention in supercapacitors owing to their unique twodimensional structure, remarkable chemical stability, high surface area, and high electrical conductivity. The research of mixed transition metal oxide has also become a hotspot recently. This work concerns the preparation, characterization of Co2NiO4 composite on carbon cloth for high-performance pseudocapacitors. We design and synthesize Co2NiO4 porous nanotubes through a template with a simple electrochemical method followed by a thermal annealing treatment. We prepare Co2NiO4 nanotubes were by a template together with simple the electrochemical method followed by a thermal annealing treatment. A nanosheets-shape form on the ZnO nanorods firstly and then turns in to 3D a hollow nanostructure is composed of a nanotube with a porous nanosheet. Owing to these advantageous structural features, the Co2NiO4 nanotubes electrode presents good specific capacitance, charge/discharge ability, and cycling stability. The Co2NiO4 electrode exhibits a maximum areal capacitance of 0.17 F/cm2 at 0.1 mA/cm2. The specific capacitance of the Co2NiO4 electrode shows 95% capacitance retention over 5000 cycles.