Composites of Manganese oxide/Carbon aerogel from Water Hyacinth for supercapacitor application

Abstract

This study describes the synthesis of cellulose aerogel using water hyacinth, glutaraldehyde (GA), polyvinyl alcohol (PVA), and carboxymethyl cellulose (CMC). The carbonization process of cellulose aerogel into carbon aerogel was investigated under N2 atmosphere at temperatures of 600 °C, 700 °C, and 800 °C, using a heating rate of 10 °C/min and a fixed duration of 2 h. To enhance the properties of the carbon aerogel, Manganese oxide particles were attached to its surface through a metal wetting method utilizing Mn(NO3)2.4H2O at a concentration of 5 %. The results indicate that cellulose aerogel carbonized at 700 °C exhibits higher electrical storage capacity compared to the aerogels carbonized at the other two temperatures. The capacitance of the supercapacitor reaches its maximum value when the Mn content is 24.31 %. In galvanostatic charge/discharge (GCD) test, the maximum capacitance is achieved at a current density of 0.2 A/g.