Development of High Electrochemical Performance-Reliability TiO2 Nanoparticle-Mulberry Paper Based Supercapacitor

Abstract

The paper-based energy storage systems with lightweight, thin and large scalability have been attracted much attention in the field of next generation research. Along with the advantages of these papers, they have excellent flexibility and wettability, so they have high power density even under mechanical bending and twisting deformation, making them suitable for wearable devices. However, conventional paper has limited electrochemical stability due to its low chemical resistance and decomposition in organic or acidic electrolytes.Mulberry paper can be an outstanding alternative for overcoming the limitations of conventional paper-based energy storage systems. Mulberry fibers form a stronger mechanical network and are longer than conventional paper fibers, so they have excellent chemical strength. Therefore, in this study, a supercapacitor with high electrochemical performance and reliability was produced based on mulberry paper.As high electrochemical performance active materials, TiO2 nanoparticle and graphene oxide nanocomposites were used. A TiO2 nanoparticle was coated on a mulberry paper substate, graphene oxide was coated, and heat treatment was performed at 700℃ under nitrogen atmosphere for 3 hours. Mulberry paper was carbonized to increase areal energy density. It was strongly fixed by the reduced graphene oxide to maintain the flexibility of carbonized mulberry paper and prevent the delamination of the TiO2 nanotube without protection layer.Therefore, it is suitable for wearable energy storage systems because it can maintain excellent charge-discharge cycle reliability and flexibility carbonized mulberry paper by improving areal energy density from carbonized mulberry paper and metal oxides and preventing the delamination of the metal oxide.