Interactions between Graphene and Ionic Liquid Electrolyte in Supercapacitors

Li, Jing; Tang, Jie; Yuan, Jinshi; Zhang, Kun; Shao, Qingguo; Sun, Yige; Qin, Lu‐Chang

doi:10.1016/j.electacta.2016.03.036

Cited by 63 publications

(31 citation statements)

References 38 publications

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“…Electrochemical capacitors (ECs), are considered as one of the most promising candidate for energy storage systems, due to their ability to store high energy, reversibility, high power performance , high rate capability and very long life cycle [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium

Kakaei

Hamidi

Husseindoost

2016

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium

Kakaei

Hamidi

Husseindoost

2016

Journal of Colloid and Interface Science

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“…For example, the ionic conductivity is only~2 mS cm −1 in ILs but as high as~1 S cm −1 in aqueous electrolytes [5,9]. More significantly, the susceptibility of the ILs' electrochemical behaviors to some central factors (e.g., interaction between electrolyte ions and electrode materials [14,15], the pore size influence [16,17], and the heteroatom-doping effect [17,18]) has still defied unambiguous description, which bewilders researchers as to which properties of carbon materials should be highlighted to match with ILs. Accordingly, it is far-reaching to study the structure-performance relation depending on electrolyte and carbon electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Electrolyte-Dependent Supercapacitor Performance on Nitrogen-Doped Porous Bio-Carbon from Gelatin

Deng

Song

et al. 2020

Nanomaterials

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The carbon supercapacitance strongly relies upon the electrolyte’s nature, but the clear-cut structure–performance nexus remains elusive. Herein, a series of bio-carbons with gradually varied pore structure and surface chemistry are derived using a new salt template protocol (with eco-benign KNO3 as the template, activator, and porogen, and cheap gelatin as the carbon precursor), and are used as model systems to probe the dependence of the electrochemical mechanism of such nanocarbons on two typical electrolytes (KOH and EMIBF4). By only adjusting the KNO3 dosage, two pivotal figures of merit of biochar—multiscale porosity and surface functionalization—were finely modulated to construct electric double layers. Electrochemical data clarify that the combined porosity and doping effects all contribute to enhanced supercapacitance, but with only one of the two factors playing the leading role in different electrolytes. Kinetic analysis corroborates the fact that ample heteroatom doping can effectively compensate capacitance by intensive surface redox insertion in KOH, while a suitable pore size dispersion plays a preponderant part in self-amplifying the ion partitioning, and thus dictating a good charge separation in EMIBF4. A quasi-quantitative model of performance–structure relevance in EMIBF4 is judiciously conjectured to hint at a superb ion–pore-size compatibility, in which the bi- and mono-layer ion confinement coupling in integrated single and double ion-sized pores is found to be more useful for curbing notorious over-screening effects and for changing the coordination number, Coulombic ordering, and phase conformation of EMIBF4 in several nm-sized nanopores. This unique energy storage fashion in ion-matching pores promotes the energy density of optimal samples to a novel level of 88.3 Wh kg−1 at 1 kW kg−1, which rivals the overwhelming majority of the reported carbon materials. In short, the comparison case study here reveals a valuable correlation of carbon’s figure of merit and electrolyte type, which may act as a vital rudder to design electrolyte-contingent state-of-the-art supercapacitor materials.

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“…Supercapacitors (SCs), owing to their fast charge/discharge capability and almost unlimited lifetime, have been considered promising energy-storage devices to supply power for various electronic devices [3][4][5] . Because the energy density of SCs is proportional to the square of the working voltage, the amount of energy stored in SCs mainly depends on the stability of the applied electrolyte over the voltage range [6][7][8] . Owing to their wide potential window (>2.5 V), nonvolatility, nonflammability, and high thermal/chemical stability, flexible ionogel SCs (FISCs) based on ionic liquid (IL) electrolytes not only have great promise for achieving a high energy density but are also safe and have a wide usage temperature range in portable and wearable electronics 9 .…”

Section: Introductionmentioning

confidence: 99%

Boosting ion dynamics through superwettable leaf-like film based on porous g-C3N4 nanosheets for ionogel supercapacitors

et al. 2019

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Ionic liquid (IL) electrolytes have enormous potential for the development of high energy density supercapacitors (SCs) owing to their wide potential windows, but ILs are plagued by sluggish ionic diffusion due to their high viscosity and large ion size. Exploiting superwettable electrodes possessing high compatibility with IL electrolytes remains challenging. Inspired by the biological characteristics observed in nature, a unique film electrode with a Monstera leaflike nanostructure is synthesized and used to overcome the aforementioned bottleneck. Similar to the pores in Monstera leaves that allow the permeation of air and water vapor, the film electrode is based on porous g-C 3 N 4 nanosheets (~1 nm thick) as ion-accessible "highway" channels, allowing ultrafast diffusion of IL ions. The film exhibits a high diffusion coefficient (3.68 × 10 −10 m 2 s −1 ), low activation energy (0.078 mJ mol −1 ) and extraordinary wettability in the IL electrolyte, indicating its superior IL ion dynamics. As a proof of concept, flexible ionogel SCs (FISCs) with tailorability and editability are fabricated, which exhibit a high energy density (10.5 mWh cm −3 ), high-power density, remarkable rate capability, and long-term durability, outperforming previously reported FISCs. Importantly, these FISCs can be effectively charged by harvesting sustainable power sources, particularly the rarely studied wind power, for practical applications.

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Interactions between Graphene and Ionic Liquid Electrolyte in Supercapacitors

Cited by 63 publications

References 38 publications

Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium

Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium

Electrolyte-Dependent Supercapacitor Performance on Nitrogen-Doped Porous Bio-Carbon from Gelatin

Boosting ion dynamics through superwettable leaf-like film based on porous g-C3N4 nanosheets for ionogel supercapacitors

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