Electrochemical investigation of graphene/nanoporous carbon black for supercapacitors

Sarpoushi, Mahdi Robat; Nasibi, Mahdi; Moshrefifar, Masoud; Mazloum-Ardakani, Mohammad; Ahmad, Zaki; Riazi, Hamid

doi:10.1016/j.mssp.2015.01.037

Cited by 8 publications

(1 citation statement)

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“…All the CNOs deviated from the ideal value of 90 • at low frequencies, indicating the faradaic contributions to the charge storage mechanism [13]. In this regard, the electron density of the aromatic rings could lead to greater faradaic contributions and, consequently, a larger deviation in φ (73.2 • vs. 90 • ) [69,70]. The Bode plot of the impedance vs. frequency (Figure 11c) also shows that the pyr-CNOs possessed a lower impedance than the ox-CNOs, including that the functionalization process that was performed with the pyrene groups could restore the intrinsic properties of the nanomaterial, despite the previous oxidation process.…”

Section: Sample Specific Capacitance (Equation (2)) (F/g) Specific Camentioning

confidence: 94%

Evaluation of the Covalent Functionalization of Carbon Nano-Onions with Pyrene Moieties for Supercapacitor Applications

et al. 2020

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Herein, we report the surface functionalization of carbon nano-onions (CNOs) through an amidation reaction that occurs between the oxidized CNOs and 4-(pyren-4-yl)butanehydrazide. Raman and Fourier transform infrared spectroscopy methods were used to confirm the covalent functionalization. The percentage or number of groups in the outer shell was estimated with thermal gravimetric analysis. Finally, the potential applications of the functionalized CNOs as electrode materials in supercapacitors were evaluated by cyclic voltammetry and electrochemical impedance spectroscopy. Functionalization increased the specific capacitance by approximately 138% in comparison to that of the pristine CNOs, while acid-mediated oxidation reduced the specific capacitance of the nanomaterial by 24%.

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Section: Sample Specific Capacitance (Equation (2)) (F/g) Specific Camentioning

confidence: 94%