Facile Synthesis of Schlumbergera Bridgesii-Like Nanostructured Co₃O₄@MnO₂ as High Performance Electrode Materials for Supercapacitors

Abstract

Tailored nanoarchitecture design is of great significance for the performance of supercapacitors, especially for heterostructure composites. Herein, we report a facile two-step hydrothermal strategy to prepare Co 3 O 4 @MnO 2 nanocomposites, where the well-aligned Co 3 O 4 nanograss array is capable of loading numerous and uniformly vertical MnO 2 nanosheets that present an open structure of a nanoflower pattern. The microstructure of the nanograsses and nanoflower can be regulated by adjusting the hydrothermal process. The optimized Co 3 O 4 @MnO 2 displays a Schlumbergera bridgesii-like nanostructure with a maximum specific capacitance of 5038.19 F g −1 as well as excellent capacity retention of as high as 97.48% after undergoing 5000 cycles at 10 A g −1 . The assembled symmetric supercapacitor also exhibits a high energy density of 1467.23 Wh kg −1 and a maximum power density of 5500.07 W kg −1 . This work provides a tunable strategy for the fabrication of heterostructure nanostructured composite for supercapacitor.