Dandelion-Like CuCo2O4@ NiMn LDH Core/Shell Nanoflowers for Excellent Battery-Type Supercapacitor

Dandelion-like CuCo2O4 nanoflowers (CCO NFs) with ultrathin NiMn layered double hydroxide (LDH) shells were fabricated via a two-step hydrothermal method. The prepared CuCo2O4@NiMn LDH core/shell nanoflowers (CCO@NM LDH NFs) possessed a high specific surface area (similar to 181 m(2)center dot g(-1)) with an average pore size of similar to 256 nm. Herein, the CCO@NM LDH NFs exhibited the typical battery-type electrode material with a specific capacity of 2156.53 F center dot g(-1) at a current density of 1 A center dot g(-1). With the increase in current density, the rate capability retention was 68.3% at a current density of 10 A center dot g(-1). In particular, the 94.6% capacity of CCO@NM LDH NFs remains after 2500 cycles at 5 A center dot g(-1). An asymmetric supercapacitor (ASC) with CCO@NM LDH NFs//activated carbon (AC) demonstrates a remarkable capacitance of 303.11 F center dot g(-1) at 1 A center dot g(-1) with excellent cycling stability. The coupling and synergistic effects of multi-valence transition metals provide a convenient channel for the electrochemical process, which is beneficial to spread widely within the realm of electrochemical energy storage.

Automated summary

Dandelion-like CuCo2O4 nanoflowers with ultrathin NiMn layered double hydroxide shells were fabricated via a two-step hydrothermal method. The prepared CuCo2O4@NiMn LDH core/shell nanoflowers possessed a high specific surface area and exhibited typical battery-type electrode material characteristics. An asymmetric supercapacitor with CuCo2O4@NiMn LDH nanoflowers//activated carbon showed outstanding capacitance and cycling stability.