High areal-capacitance based extremely stable flexible supercapacitors using binder-free exfoliated graphite paper electrode

• DOI: 10.1063/5.0184499
• Publication Date: 2024-01-05T11:18:15Z
• Authors: Jitendra Kumar Yadav; Bharti Rani; Ajay Tiwari; Ambesh Dixit
• Keywords: Current collector; Horizontal scan rate; Exfoliation joint

The highly porous and binder-free flexible paper electrodes can enhance the specific capacitance of symmetric supercapacitors (SCs) due to their large surface effective ion diffusion pathways. We synthesized exfoliated graphite (ExG) by thermal exfoliation method chemically treated flakes compressed it into a paper-like thin sheet (binder-free) ∼0.15 mm thickness. coin cell SCs with copper (Cu) stainless steel (SS) as current collectors have been fabricated for electrochemical measurement. cyclic voltammetry galvanostatic charge/discharge measurements are investigated at various scan rates densities. Cu foil collector perform better than SS-based SCs. collector-based showed 37.08 mF cm−2, whereas was ∼29.98 cm−2 0.01 V s−1 rate across 0–0.6 potential window. Approximately no degradation in charge storage capacity more 15 000 cycles 0.1 shows ultra-stability ExG-based electrodes. A digital watch is powered using pouch supercapacitor copper-based show