Sodium Dodecylbenzene Sulfonate Assisted Electrodeposition of MnO2@C Electrode for High Performance Supercapacitor

In this work, MnO 2 &SDBS electrodes with nano-honeycomb morphology were prepared by ultrasound-assisted electrochemical deposition using sodium dodecylbenzene sulfonate (SDBS) as a surfactant agent. The effect and mechanism of SDBS on the morphology of MnO 2 nanomaterials during the preparation of MnO 2 by electrochemical anodic oxidation was systematically investigated by varying the content of SDBS in the precursor solution. When the SDBS concentration is 2 g · l −1 , the resulting electrode has the best electrochemical performance, and the specific capacitance is up to 407 F · g −1 at the current density of 1000 mA · g −1 . To further enhance its performance, a carbon coating layer was deposited on the surface of the electrode using a method similar to chemical vapor deposition. Finally, the MnO 2 &SDBS@C electrode with a three-dimensional net-to-film composite structure with a high specific surface area, hierarchical structure and interconnect with nickel foam supports were obtained. The electrode has excellent electrochemical performance, and the specific capacitance is still up to 289 F · g −1 at a high current density of 5000 mA · g −1 . Furthermore, the specific capacitance of the electrode was maintained at 83.9% after 500 cycles of charging and discharging at a current density of 2000 Am·g −1 .