The highly porous and binder-free flexible paper electrodes can enhance the specific capacitance of symmetric supercapacitors (SCs) due to their large surface and effective ion diffusion pathways. We synthesized the exfoliated graphite (ExG) by the thermal exfoliation method of chemically treated graphite flakes and compressed it into a paper-like thin sheet (binder-free) of ∼0.15 mm thickness. The coin cell SCs with copper (Cu) and stainless steel (SS) as current collectors have been fabricated for the electrochemical measurement. The cyclic voltammetry and galvanostatic charge/discharge measurements are investigated at various scan rates and current densities. The SCs with Cu foil as a current collector perform better than SS-based SCs. The Cu current collector-based SCs showed a specific capacitance of 37.08 mF cm−2, whereas it was ∼29.98 mF cm−2 for SS-based SCs at a 0.01 V s−1 scan rate across a 0–0.6 V potential window. Approximately no degradation in charge storage capacity for more than 15 000 cycles at 0.1 V s−1 shows the ultra-stability of the flexible ExG-based binder-free electrodes. A digital watch is powered using the fabricated pouch cell supercapacitor with copper-based current collectors to show the potential of SCs.
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March 2024
Research Article|
January 05 2024
High areal-capacitance based extremely stable flexible supercapacitors using binder-free exfoliated graphite paper electrode
Jitendra Kumar Yadav
;
Jitendra Kumar Yadav
(Data curation, Formal analysis, Methodology, Validation, Writing – original draft)
Advanced Materials and Device (A-MAD) Laboratory, Department of Physics, Indian Institute of Technology Jodhpur
, Jodhpur, India
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Bharti Rani;
Bharti Rani
(Data curation, Investigation, Methodology, Validation, Writing – original draft)
Advanced Materials and Device (A-MAD) Laboratory, Department of Physics, Indian Institute of Technology Jodhpur
, Jodhpur, India
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Ajay Tiwari
;
Ajay Tiwari
a)
(Data curation, Formal analysis, Methodology, Validation, Writing – original draft)
Advanced Materials and Device (A-MAD) Laboratory, Department of Physics, Indian Institute of Technology Jodhpur
, Jodhpur, India
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Ambesh Dixit
Ambesh Dixit
b)
(Conceptualization, Formal analysis, Funding acquisition, Methodology, Project administration, Resources, Supervision, Writing – review & editing)
Advanced Materials and Device (A-MAD) Laboratory, Department of Physics, Indian Institute of Technology Jodhpur
, Jodhpur, India
b)Author to whom correspondence should be addressed: [email protected]
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b)Author to whom correspondence should be addressed: [email protected]
a)
Present address: Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
J. Renewable Sustainable Energy 16, 014101 (2024)
Article history
Received:
October 25 2023
Accepted:
December 07 2023
Citation
Jitendra Kumar Yadav, Bharti Rani, Ajay Tiwari, Ambesh Dixit; High areal-capacitance based extremely stable flexible supercapacitors using binder-free exfoliated graphite paper electrode. J. Renewable Sustainable Energy 1 January 2024; 16 (1): 014101. https://doi.org/10.1063/5.0184499
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