Preparation of hybrid paper electrode based on hexagonal boron nitride integrated graphene nanocomposite for free-standing flexible supercapacitors

• Published in: RSC advances Vol. 11; no. 6; pp. 3445 - 3451
• Main Authors: Rajendran, Jerome, Reshetilov, Anatoly N, Sundramoorthy, Ashok K
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 15.01.2021; The Royal Society of Chemistry
• Subjects: Boron; Boron nitride; capacitance; Chemistry; Current density; Discharge; Dispersion; electrical conductivity; Electrical resistivity; electrochemical capacitors; Electrodes; Electronic devices; energy; Energy storage; filtration; Graphene; Nanocomposites; nanosheets; Nanostructure; Raman spectroscopy; Storage systems; Supercapacitors; Vacuum filtration
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d0ra10735b

Flexible energy storage devices have received great interest due to the increasing demand for wearable and flexible electronic devices with high-power energy sources. Herein, a novel hybrid flexible hexagonal boron nitride integrated graphene paper (BN/GrP) is fabricated from 2D hexagonal boron nitride (h-BN) nanosheets integrated with graphene sheets dispersion via a simple vacuum filtration method. FE-SEM indicated that layered graphene nanosheets tightly confined with h-BN nanosheets. Further, the Raman spectroscopy confirmed successful integration of BN with graphene. As-prepared BN/GrP free-standing flexible conductive paper showed high electrical conductivity of 5.36 × 10 4 S m −1 with the sheet resistance of 8.87 Ω sq −1 . However, after 1000 continuous bending cycles, the BN/GrP sheet resistance increased just about 8.7% which indicated good flexibility of the paper. Furthermore, as-prepared BN/GrP showed excellent specific capacitance of 321.95 F g −1 at current density of 0.5 A g −1 . In addition, the power and energy densities were obtained as 3588.3 W kg −1 , and 44.7 W h kg −1 , respectively. The stability of the prepared flexible electrode was tested in galvanostatic charge/discharge cycles, where the results showed the 96.3% retention even after 6000 cycles. These results exhibited that the proposed BN/GrP may be useful to prepare flexible energy-storage systems. As-prepared BN/GrP free-standing flexible conductive paper showed high electrical conductivity of 5.36 × 10 4 S m −1 with the sheet resistance of 8.87 Ω sq −1 . Furthermore, BN/GrP showed excellent specific capacitance of 321.95 F g −1 at current density of 0.5 A g −1 . In addition, the power and energy densities were obtained as 3588.3 W kg −1 , and 44.7 W h kg −1 .