Fabrication of Flexible Supercapacitors From Graphite and Graphene With Cellulose Nanocrystals as Binders

The current global warming is driving the use of clean and renewable energy. Intermittence is a drawback of clean energy. Energy storage is the answer to intermittence. Flow batteries, batteries, capacitors, and supercapacitors are among the most used energy storage devices in the world. In this paper, capacitors made from graphite and commercial graphene were fabricated. The obtained specific capacitances reached 851 F g −1 , indicating that the devices meet the performance standard for supercapacitors. The devices were fabricated using cellulose nanocrystals as binding material in the electrode, thus using an environmentally friendly binding material. Cyclic voltammetry revealed a quasi‐rectangular process. Charge–discharge cycles revealed a storage mechanism of electrical double layer. The Warburg impedance indicates the diffusive impedance of electrolyte ions in the devices.