Porous carboxymethyl cellulose carbon of lignocellulosic based materials incorporated manganese oxide for supercapacitor application

Abstract

The present work developed porous carboxymethyl cellulose (CMC) carbon film from lignocellulosic based materials as supercapacitor electrode. Porous CMC carbon films of bamboo (B) and oil palm empty fruit bunch (O) were prepared through simple incipient wetness impregnation method followed by calcination process before incorporation with manganese oxide (Mn₂O₃). The carbonization produced porous CMC carbon whereby CMCB exhibited higher surface area than CMCO. After Mn₂O₃ incorporation, the crystallite size of CMCB and CMCO were calculated as 50.09 nm and 42.76 nm, respectively whereas Mn₂O₃/CMCB and Mn₂O₃/CMCO composite films were revealed to be 26.71 nm and 35.60 nm in size, respectively. Comparatively, the Mn₂O₃/CMCB composite film exhibited higher electrochemical performance which was 31.98 mF cm^-2 as compared to 24.15 mF cm^-2 by Mn₂O₃/CMCO composite film and both CMC carbon films with fairly stable cycling stability after 1000 charge-discharge cycles. Therefore, it can be highlighted that Mn₂O₃/CMC composite film as prepared from bamboo and oil palm fruit can potentially become the new electrode materials for supercapacitor application.

Keywords: Carboxymethyl cellulose; Porous carbon; Supercapacitor.