Preparation and electrochemical performance study of La-doped nano-flower-like NiMn2O4/CuCo2O4 composite materials
摘要
A La-doped NiMn2O4/CuCo2O4 hybrid was synthesized via a solvothermal method. Structural and morphological characterization confirmed the composite consists of La-modified NiMn2O4 integrated with CuCo2O4, with tetrabutylammonium bromide acting as a morphology-directing agent to induce a hierarchical nanoflower architecture. This highly branched framework offers a substantially enlarged active surface area, promoting electrolyte infiltration and ion transport for improved charge storage. The porous nanoflower structure accommodates cyclic volume changes well, improving mechanical resilience and durable cycling behavior. In terms of electrochemistry, the composite shows an increased specific capacitance of 1890 F g− 1 at 1 A g− 1, keeping 1799 F g− 1 (95.2%) after 3000 cycles test. The asymmetric supercapacitor built by La-NiMn2O4/CuCo2O4/CNTs electrodes can get a specific capacitance of 168 F g− 1 at 1 A g− 1, as well as an energy density of 72.4 Wh·kg− 1 and a power density of 13,500 W·kg− 1 under the high discharge rate of 20 A g− 1. The mixed-component design of the electrode acts as a potential technical approach for the preparation of high-performance supercapacitors.