Low-cost supercapacitor based on colloidal graphite

Author(s)

Klema, Maykel dos Santos ^[1] ; Nogueira, Gabriel Leonardo ^[1] ; Alves, Neri ^[1]

Affiliation

^[1] Univ Estadual Paulista UNESP, Fac Tecnol & Ciencias, BR-19060900 Presidente Prudente, SP - Brazil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 24, n. 1 2021.
• Web of Science Citations: 0

Abstract

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(-1) for 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(-1) and 3 Wh kg(-1), respectively. All the experimental results indicate that the colloidal graphite Aquadag (R) is a promising material for application in supercapacitors. (AU)

• FAPESP's process: 15/18091-8 - Study of organic supercapacitors printed onto paper based on PEDOT:PSS
• Grantee: Maykel dos Santos Klem
• Support Opportunities: Scholarships in Brazil - Master