Nitrogen-doped mesoporous graphene nanoflakes for high performance ionic liquid supercapacitors

Arkhipova, Ekaterina A.; Иванов, А. С.; Маслаков, К. И.; Savilov, S. V.

doi:10.1016/j.electacta.2020.136463

Cited by 23 publications

(15 citation statements)

References 49 publications

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“…The morphology of the carbon derivatives has a direct influence on the available active sites for charge accumulation. In graphene, the aggregation due to the van der Waals forces and the π–π interaction between the graphene nanosheets ,, leads to poor contact between the surface of the material and the electrolyte, which affects the transport of ions and electrons. ,,, …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of N-Doped Carbon-Based Electrodes for Supercapacitors

Orlando

Lima

et al. 2022

ACS Appl. Electron. Mater.

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Capacitors are a ubiquitous component of many modern-day electronics that provide remote sensing, power conditioning, electrical noise filtering, signaling coupling or decoupling, and short-term memory storage. With the desire for flexible, smaller, and more powerful electronics, capacitors and other electrical components will have to be improved to meet these growing demands. Carbon-derived materials are good candidates for use as electrodes in electrochemical capacitors (i.e., supercapacitors) because of their nanoscale and flexible architecture. However, implementations of these materials tend to have inferior specific capacitance and energy density compared with other options. In this work, different carbon derivatives (graphene oxide, Claisen graphene, activated charcoal oxide, and activated charcoal Claisen) were chemically modified via nitrogen doping to optimize the capacitance, power density, energy density, and the overall electrochemical performance of the resulting supercapacitors. Devices with a two-electrode configuration were assembled and confirmed the superior performance for all N-doped carbon derivatives in all analyzed parameters (specific capacitance, energy density, and power density) when compared with their undoped counterparts. The maximum areal capacitance obtained was 421.44 mF/cm2 for the N-doped activated charcoal oxide, which represents an improvement of 242.2% in comparison with the corresponding nonmodified sample, in addition to a 153% improvement in the energy density and strong retention in specific capacitance (in the order of 86% at 1000 cycles of operation).

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Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of N-Doped Carbon-Based Electrodes for Supercapacitors

Orlando

Lima

et al. 2022

ACS Appl. Electron. Mater.

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“…The energy density of FASP10‐800 can reach up to 55.4 Wh kg −1 at power density of 87.5 W kg −1 and can still maintain 35.2 Wh kg −1 at high power density of 8.75 kW kg −1 , much better than that of AC. Satisfactorily, these values of FASP10‐800 can be compared with or even surpass many porous carbons in literature, as displayed in SI Table S4 [6,11,23,37–43] …”

Section: Resultsmentioning

confidence: 88%

Hierarchical Nanoporous C/C Composite from Humic Fulvic Acid and Sulfonated Pitch for High‐Energy‐Density EDLC Electrodes

et al. 2021

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As a new type of energy storage device, electric double layer capacitors (EDLCs) possess fast charge/discharge speed and good cycling stability. However, the low energy density and high production cost of EDLC electrodes are still big challenges. Herein, a hierarchical nanoporous C/C composite is synthesized by chemical recombination and subsequent activation strategy from low‐cost carbon resources, namely renewable humic fulvic acid (FA) and industrial sulfonated pitch (SP). Profiting from the abundant polycyclic aromatic hydrocarbons in SP and plentiful oxygen‐containing groups in FA, the resultant nanoporous C/C composite has both high e‐conductivity and high specific surface area (SSA). Thus, this porous C/C composite can be directly fabricated as EDLC electrode without any conductive agent. By fully exploiting the synergistic effect between high e‐conductivity and high SSA, it shows excellent electrochemical stability in EMIMBF4 ionic liquid electrolyte. Furthermore, it possesses a higher specific gravimetric capacitance (117 F g−1) than that of pure FA‐based porous carbon (92.5 F g−1) at a current density of 1 A g−1. More importantly, the maximum energy density can be as high as 55.4 Wh kg−1, largely better than commercial activated carbon.

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“…2). The N1s spectrum of N-GNFs shows the contribution from pyridinic (398.1 eV; N6), pyrrolic (399.4 eV; N5), and graphitic (also called as quaternary) (401.1 eV; N-G) nitrogen species, along with oxidized pyridine N-oxides (402.5 eV), R-ONO (403.8 eV), R-NO 2 (405.5 eV), and R-ONO 2 (407.4 eV) forms [15] (Table 1). The total nitrogen content (6.2-6.6 at %) is virtually independent of the synthesis time.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Nitrogen Heterosubstitution in Graphene Nanoflakes: An Effective Approach to Improving Performance of Supercapacitors with Ionic Liquid Electrolyte

Arkhipova

Иванов

Маслаков

et al. 2021

Russ. J. Phys. Chem.

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Nitrogen-doped graphene nanoflakes with a high nitrogen content (6.6 at %) and developed mesoporosity were synthesized via pyridine pyrolysis. They were tested in a supercapacitor with a non-aqueous electrolyte: a 1.2 M solution of ionic liquid Et4N+TFSI− in acetonitrile. It was found that incorporation of nitrogen into the graphene layers nearly tripled the specific capacitance of the electrode, compared to the undoped nanoflakes.

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Nitrogen-doped mesoporous graphene nanoflakes for high performance ionic liquid supercapacitors

Cited by 23 publications

References 49 publications

Electrochemical Performance of N-Doped Carbon-Based Electrodes for Supercapacitors

Electrochemical Performance of N-Doped Carbon-Based Electrodes for Supercapacitors

Hierarchical Nanoporous C/C Composite from Humic Fulvic Acid and Sulfonated Pitch for High‐Energy‐Density EDLC Electrodes

Nitrogen Heterosubstitution in Graphene Nanoflakes: An Effective Approach to Improving Performance of Supercapacitors with Ionic Liquid Electrolyte

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