High electrochemical performance of MnCo2O4.5 nanoneedles/NiCo LDH nanosheets as advanced electrodes of supercapacitor

MnCo2O4.5@NiCo layered double hydroxides (LDHs) are synthesized on nickel foam (NF) using the hydrothermal-calcination-hydrothermal method. It retains MnCo2O4.5 nanoneedles and NiCo LDH nanosheets structures, improving its electrochemical performance. The composite has an excellent specific capacity (1266 C g(-1) when current density is 2 A g(-1)) and deliver an outstanding initial capacity retention (96.8% when current density is 20 A g(-1)). Moreover, the self-assembled MnCo2O4.5@NiCo LDH/NF//AC (actived carbon) asymmetric supercapacitor (ASC) provides the highest energy density of 33.3 W h kg(-1) when the power density is 798 W kg(-1) and has a long cycle life of 81% at 5 A g(-1) after 7000 cycles. The above results provide a useful strategy for new-generation energy storage devices with excellent properties.

Automated summary

MnCo2O4.5@NiCo layered double hydroxides (LDHs) were synthesized on nickel foam (NF) using hydrothermal-calcination-hydrothermal method, retaining the structures of MnCo2O4.5 nanoneedles and NiCo LDH nanosheets, resulting in improved electrochemical performance. The composite exhibited excellent specific capacity (1266 C g(-1) at 2 A g(-1) current density) and demonstrated outstanding initial capacity retention (96.8% at 20 A g(-1) current density). Furthermore, the self-assembled MnCo2O4.5@NiCo LDH/NF//AC (activated carbon) asymmetric supercapacitor (ASC) achieved the highest energy density of 33.3 W h kg(-1) at a power density of 798 W kg(-1) and maintained a long cycle life of 81% at 5 A g(-1) after 7000 cycles.