Preparation and Application of Flower-Rods-Like Bi2S3/Co3O4/rGO/Nickel Foam Supercapacitor Electrode

Herein, we prepared a new nanocomposite Bi2S3/Co3O4/rGO/Ni foam substrate (BCGN) electrode through hydrothermal synthesis and annealing process. SEM clearly shows that the Bi2S3/rGO/Ni foam substrate and Co3O4/rGO/Ni foam substrate prepared under the experimental conditions are cuboid-shaped and curd-shaped, respectively. However, the shape of BCGN is a perfect combination of the above two. We call this cuboid full of petals a flower-rods-like. The BET test found that the specific surface area of this unique morphology is as high as 152.7 cm2 g-1, which is beneficial to charge transfer and improves the overall electrochemical reaction performance of the electrode. In addition, electrochemical performance test displayed that the BCGN electrode had a high specific capacitance of 2214.3 F·g-1 at 1 A·g-1. More importantly, BCGN//AC asymmetric supercapacitors have a high energy density of 133.4 Wh·kg-1 at a power density of 800.1 W·kg-1 and a power density of 70.5 Wh·kg-1 at a high power density of 8568.2 W·kg-1. And under the condition of 10 A·g-1 current density, the capacitance retention rate is still extremely high 99.4% after 10000 continuous charge and discharge tests. In practical application, two BCGN//AC series can make the 2.5V bulb maintain a high brightness for 1 minutes.