Microwave aided scalable synthesis of sulfur, nitrogen co-doped few-layered graphene material for high-performance supercapacitors

Rotte, Naresh Kumar; Naresh, Vangapally; Muduli, Sadananda; Reddy, Venu; Srikanth, Vadali Venkata Satya Siva; Martha, Surendra K.

doi:10.1016/j.electacta.2020.137209

Cited by 46 publications

(11 citation statements)

References 51 publications

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“…In addition, compared with carbon atom, nitrogen atom have larger electronegativity, which can cause the polarization of carbon atoms in graphene sheets, thus facilitating the adsorption of electrolyte ions on the surface of the sample and improves its capacitive property. In NOGHs, the pseudocapacitance of different N bonding configurations can be generated under 6 M KOH solutions as follows: 46,47 –C–N–C + H 2 O + e − ↔ –C–NH–C + OH − –C NH + H 2 O + 2e − ↔ –CH–NHOH …”

Section: Resultsmentioning

confidence: 99%

N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors

et al. 2021

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Section: Resultsmentioning

confidence: 99%

N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors

et al. 2021

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“…These nanosheets had a capacitance of 298 F g −1 at 1 A g −1. 30 Other research groups have enhanced the supercapacitive properties of graphene by incorporating additional species that impart pseudocapacitance characteristics 31,32 . Xu et al explored the pseudocapacitance behavior of graphene modified with abundant oxygen functional groups and achieved excellent electrochemical performance 31 .…”

Section: Introductionmentioning

confidence: 99%

Engineering oxygen functional groups in reduced graphene oxide for use in high‐performance flexible supercapacitors

Jang

Kavinkumar

Kim

2022

Intl J of Energy Research

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Summary Graphene‐based flexible supercapacitors (FSCs) are promising energy‐storage devices that can potentially power the next generation of wearable and portable electronics owing to their high‐power densities, quick charging/discharging rates, and excellent cycle lives. The manufacture of FSC devices with extended potential windows can help increase their energy density. However, the poor reaction kinetics of graphene (which has electric double‐layer capacitive properties) can lead to low energy densities. In this study, graphene nanosheets with different oxygen contents are fabricated on a flexible carbon cloth substrate through thermal treatments in an argon atmosphere. The effects of the degree of disorder, surface area, and oxygen moieties on the supercapacitive properties of the nanosheets are explored systematically. Graphene oxide electrodes reduced at 300°C are used as the cathode and anode, and they exhibit large areal capacitances of 82.7 and 324.4 mF cm−2, respectively, at 4 mA cm−2. When the proposed device is used as a symmetric FSC cell, the electrode exhibits an excellent areal capacitance (70.3 mF cm−2 at 1 mA cm−2) and long cycle life in the 0 to 1.4 V voltage window. Furthermore, the FSC cell has a maximum energy density of 19.1 μW h cm−2 at a power density of 0.69 mW cm−2.

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“…[37] Comparative electrochemical characteristics of a few other graphene materials explored as supercapacitor electrodes is shown (Supplementary Table T1). [20,[35][36][37][38][39][40][41] Overall, doped and various morphologies of graphene have been investigated, which may need some expensive instruments or be timeconsuming. Graphene-based supercapacitors depict long cycling stability due to tunable carbon networks, but layers' stacking presents less capacitance comprising its limited realtime application.…”

Section: Introductionmentioning

confidence: 99%

Electrochemically Exfoliated Layered Carbons as Sustainable Anode Materials for Lead Carbon Hybrid Ultracapacitor

et al. 2022

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Lead‐carbon hybrid ultracapacitors (Pb−C HUC) have become apparent as a way out of the sulfation issue of lead‐acid batteries, simultaneously enhancing the system‘s power density and cycle life. In this work, exfoliated graphene oxides (EGO) were synthesized by the electrochemical exfoliation method followed by chemical activation and carbonization at 600 °C (AEGO‐600). The composite electrode delivered 800 F g−1 capacitance at 1 A g−1. The Pb−C HUC fabricated using AEGO‐600 anode and PbO2 cathode can achieve capacitance of 325 F g−1 at 10 A g−1 and retain 71 % capacitance after 15000 charge‐discharge cycles in the voltage range of 2.3–0.8 V. The highly stable capacitance was due to the formation of layered carbons in AEGO‐600 that enhanced the favorable electrolyte ion assessment to maximum active sites. Owing to the facile, cost‐effective synthesis approach and better charge storage behavior, the activated‐exfoliated graphene oxides thus produced could be suitable candidates for future hybrid ultracapacitor systems.

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Microwave aided scalable synthesis of sulfur, nitrogen co-doped few-layered graphene material for high-performance supercapacitors

Cited by 46 publications

References 51 publications

N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors

N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors

Engineering oxygen functional groups in reduced graphene oxide for use in high‐performance flexible supercapacitors

Electrochemically Exfoliated Layered Carbons as Sustainable Anode Materials for Lead Carbon Hybrid Ultracapacitor

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