Low-cost supercapacitor based on colloidal graphite

• Main Author: Dos Santos Klem, Maykel [UNESP]
• Publication Date: 2021
• Other Authors: Nogueira, Gabriel Leonardo [UNESP], Alves, Neri [UNESP]
• Format: Article
• Language: eng
• Source: Repositório Institucional da UNESP
• Download full: http://dx.doi.org/10.1590/1980-5373-MR-2021-0013; http://hdl.handle.net/11449/233754
• topic: Aquadag; Colloidal Graphite; Energy Storage; Supercapacitor

Here we report the production and characterization of a low-cost supercapacitor with electrodes based on colloidal graphite. We characterized the as-prepared device in terms of cyclic voltammetry (CV), Galvanostatic charge/discharge (GCD), and impedance spectroscopy. The supercapacitor exhibited good electrochemical performance with a high capacitance of 22 F g-1for a discharge current of 2 mA. Long-term cyclability tests show that the device can keep about 85% of its capacitance after 500 cycles, even without encapsulation. We found power and energy densities of 110 W kg-1and 3 Wh kg-1, respectively. All the experimental results indicate that the colloidal graphite Aquadag® is a promising material for application in supercapacitors.