MnCo2O4 Nanosheet/NiCo2S4 Nanowire Heterostructures as Cathode Materials for Capacitors

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.

Automated summary

The study successfully synthesized three-dimensional MnCo2O4/NiCo2S4 nanostructures on a nickel foam substrate, demonstrating high specific capacity and excellent cycling performance. The assembled asymmetric capacitor showed high energy density and good capacity retention, indicating its potential in future smart micro/nano energy storage devices.