One-Step Hydrothermal Synthesis of Nanowire NiCo-LDH/Mn3O4/rGO Electrode Materials for Supercapacitors towards Excellent Electrochemical Performance

Manganese-based materials are widely used as the study of supercapacitor electrode materials due to their high theoretical specific capacitance and abundant resources. At the same time, graphene as a highly conductive material has also attracted considerable attention in the field of electrode materials. In this study, one-step hydrothermal method was used to prepare a novel nanowire-like NiCo-LDH/Mn₃O₄/rGO electrode material by growing NiCo-LDH/Mn₃O₄ nanowires on the surface of reduced graphene oxide (rGO) nanosheets. Nanowire and nanonet NiCo-LDH/Mn₃O₄/rGO electrode materials were prepared by controlling the reaction time. When the reaction time was 6 h, the nanonet NiCo-LDH/Mn₃O₄/rGO-6 electrode material composed of a large number of interlocking growing nanowires exhibited excellent electrochemical performance. At a current density of 1 A g⁻¹, it achieved a high specific capacitance of 1582 F g⁻¹. After 4000 cycles at a current density of 10 A g⁻¹, it retained 87.2% of its capacitance. The asymmetric NiCo-LDH/Mn₃O₄/rGO-6//AC device assembled with a working voltage of 1.6 V exhibited a high energy density of 32.7 Wh kg⁻¹ at a power density of 1293 W kg⁻¹. After 5000 charge-discharge cycles at a current density of 5 A g⁻¹, the capacitance retention rate was as high as 92.4%.