Ion-matching porous carbons with ultra-high surface area and superior energy storage performance for supercapacitors

Zhang, Lifeng; Guo, Yu; Shen, Kechao; Huo, Jinghao; Liu, Yi; Guo, Shouwu

doi:10.1039/c9ta00781d

Cited by 49 publications

(13 citation statements)

References 59 publications

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“…Although the mixtures of ILs/organic solvents could reduce the viscosity and enhance durability in severe environments, this is not a universal strategy, and the wide electrochemical windows of ILs would be sacrificed. More recently, Zhang et al developed the porous carbons with high specific surface area and suitable micropore diameter to match IL ions (Zhang L. et al, 2019). They emphasized the importance of ion matching porous carbons in providing an ion highway for rapid ion transport to form more effective electric double layers, which resulted in superior performance (Figures 7E-G).…”

Section: Non-amphiphilic Il Electrolytesmentioning

confidence: 99%

Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

et al. 2020

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The electrochemical stability of electrolytes is essential to the working potential of supercapacitors. Ionic liquids (ILs) are being considered as safe alternatives to current organic electrolytes and attracting extensive interests owing to their inflammability, widened potential windows, and superior ionic conductivity. Novel supercapacitors with IL electrolytes exhibit attractive energy density and can be utilized in various energy storage systems. Most previous studies focused on electrochemical performances, while rare attentions were devoted to energy storage process details or mechanisms. This review comprehensively summarizes the latest progress on formulated IL electrolytes for different types of supercapacitors, with an emphasis on the intrinsic understanding of the related energy storage mechanisms. Subsequently, comparisons of various IL-based liquid-state electrolytes as well as the state-of-the-art advancements in optimizing ILs electrolytes are introduced. The authors attempt to reveal the inherent correlation between the usage of IL electrolytes and the properties of supercapacitors via referenced works. Some emerging applications of ionogel electrolytes based on conventional polymers and poly(IL)s for flexible supercapacitors are also presented, including the existing problems. In addition, challenges and future perspectives of research in this field are highlighted.

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Section: Non-amphiphilic Il Electrolytesmentioning

confidence: 99%

Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

et al. 2020

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“…The increase is more pronounced in the case of C–KOH sample, which is related to the exceptionally high surface area. Chemical activation of carbon materials leads to the formation of micropores, and it has been well demonstrated that the ion confinement in the micropores can lead to the higher capacitance [ 50 , 51 , 52 , 53 ]. The increase of the scan rate from 10 mV s −1 to 100 mV s −1 leads to the significant distortion of the CV curve shape and the essential decrease of capacitance values for C-non and C–CO 2 samples.…”

Section: Resultsmentioning

confidence: 99%

Chestnut-Derived Activated Carbon as a Prospective Material for Energy Storage

et al. 2020

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In this work, we present the preparation and characterization of biomass-derived activated carbon (AC) in view of its application as electrode material for electrochemical capacitors. Porous carbons are prepared by pyrolysis of chestnut seeds and subsequent activation of the obtained biochar. We investigate here two activation methods, namely, physical by CO2 and chemical using KOH. Morphology, structure and specific surface area (SSA) of synthesized activated carbons are investigated by Brunauer-Emmett-Teller (BET) technique and scanning electron microscopy (SEM). Electrochemical studies show a clear dependence between the activation method (influencing porosity and SSA of AC) and electric capacitance values as well as rate capability of investigated electrodes. It is shown that well-developed porosity and high surface area, achieved by the chemical activation process, result in outstanding electrochemical performance of the chestnut-derived porous carbons.

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“…To further understand the textural properties of as‐prepared ACs, N 2 adsorption‐desorption isotherms and PSD (Figure and Table ). In the typical type I adsorption‐desorption isotherm of each AC, a sharp rise of nitrogen uptake at low relative pressure (P/P 0 < 0.05) is attributed to the existence of micropores (Figure a) . Moreover, the inconspicuous type H2 hysteresis loops of AC‐4‐550 and AC‐4‐650 at a high relative pressure (0.4‐1.0) are caused by their small amount of small mesopores .…”

Section: Resultsmentioning

confidence: 99%

Almond Shell‐Derived Carbons under Low‐Temperature Activation with Ultra‐High Surface Area and Superior Performance for Supercapacitors

et al. 2019

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Nitrogen containing almond shell‐derived porous carbons (ACs) have been synthesized by adding sodium amide (NaNH2) as activator in calcination process. The optimized carbon material is denoted as AC‐4‐550 (mass ratio of NaNH2/C equals 4 and activation temperature is 550 °C). AC‐4‐550 possesses a high specific surface area of 3249.68 m2 g−1 and total pore volume of 1.85 cm3 g−1 with approximately a half proportion of micropores. Theoretically, the heteroatoms generate pseudocapacitance and wettability, the high specific surface area provides more active adsorption sites for ions, the micropores reduce the thickness of electrical double layer to enhance capacitance and the mesopores speed up the ion transmission. In a three‐electrode supercapacitor in 6 M KOH aqueous electrolyte, the specific capacitance reached to 440.29 F g−1 at 1 A g−1, even 240.00 F g−1 at 50 A g−1. And after 10 000 cycles, AC‐4‐550 retains 92% capacitance at 10 A g−1. Furthermore, the high energy density (129.40 W h kg−1 at a power density of 900 W Kg−1) in a symmetrical coin‐cell capacitor using ionic liquid electrolyte demonstrates the possible applications in practical situation.

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Ion-matching porous carbons with ultra-high surface area and superior energy storage performance for supercapacitors

Abstract: Polypyrrole (PPy)-derived porous carbons with an ion-matching micropore diameter exhibit ultra-high specific surface area and capacitance when used in supercapacitors.

Cited by 49 publications

References 59 publications

Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

Chestnut-Derived Activated Carbon as a Prospective Material for Energy Storage

Almond Shell‐Derived Carbons under Low‐Temperature Activation with Ultra‐High Surface Area and Superior Performance for Supercapacitors

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