MnCo<sub>2</sub>O<sub>4</sub> Nanosheet/NiCo<sub>2</sub>S<sub>4</sub> Nanowire Heterostructures as Cathode Materials for Capacitors
Pengfei Hu, Ying Liu, Hengqi Liu, Xiang Wu, Baodan Liu
Abstract
Structural design and regulation of composite electrode materials is crucial for a highly efficient energy storage devices. In this work, we report three-dimensional MnCo2O4/NiCo2S4 nanostructures grown in situ on a Ni foam substrate via a multistep hydrothermal process. The obtained product delivers a specific capacity of 600 C g–1 at 0.5 A g–1 and retains 75% of the initial capacity after 10 000 cycles at 6 A g–1. Furthermore, an assembled asymmetric capacitor possesses an energy density of 90.37 Wh kg–1 at 1349.9 W kg–1 and exhibits a capacity retention of 68% after cycling, demonstrating its potential applications in future smart micro/nano energy storage devices.
Topics & Concepts
NanosheetMaterials scienceCapacitorSupercapacitorHeterojunctionEnergy storageCathodeElectrodeHydrothermal circulationNanowireOptoelectronicsNanotechnologySubstrate (aquarium)VoltageChemical engineeringElectrochemistryElectrical engineeringPower (physics)ChemistryPhysicsPhysical chemistryEngineeringQuantum mechanicsOceanographyGeologySupercapacitor Materials and FabricationAdvancements in Battery MaterialsAdvanced battery technologies research