Tailoring the textural properties of hierarchical porous carbons for supercapacitors

Zhang, Yafei; Zhang, Chuanxiang; Huang, Guangxu; Xing, Baolin; Duan, Yuhua

doi:10.1016/j.matlet.2015.07.020

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…The leakage current behavior is related to the ash content, the values of leakage current and ash contents follow the same sequence of AC1 < AC3 < AC2. The smaller values of leakage current mean less shuttle reactions caused by the ashes in the activated carbons [21]. The less ash content, the smaller leakage current, which is in according to the results in the literature [12].…”

Section: Electrochemical Propertiessupporting

confidence: 81%

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Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors

Kang

Huang

Geng³

et al. 2018

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The ash was removed before or after carbonization of potassium humate to investigate the effect of ash removal methods on pore structure and electrochemical performance of activated carbons for supercapacitors. The activated carbons were prepared by direct carbonization of potassium humate at 700 ℃ for 1 hour under N2 atmosphere with different de-ashing strategies. It was found that ash removal before carbonization was an effective strategy to reduce the ash content of the corresponding activated carbon. When de-ashing treatment was adopted after carbonization, part of the ash in activated carbon was coated with carbon and could not be removed through acid soaking. Moreover, ash removal before carbonization could better contribute to creating the micropores and the ash removed after carbonization performed as templates to mainly generate mesopores. The activated carbon with ash removed before carbonization as electrodes delivered a specific capacitance of 164.84 F/g at a current density of 50 mA/g, and exhibited typical electric double layer capacitive performance as well as lower leakage current of 15.3 µA.

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Section: Electrochemical Propertiessupporting

confidence: 81%

“…The GCD curves of the activated carbons as electrodes presented in Fig. 5 a exhibit typical triangular shapes without obvious voltage drop at the beginning of discharge, indicating the electrodes have the typical capacitive behaviors [21]. Moreover, the specific capacitances calculated from Eq.…”

Section: Electrochemical Propertiesmentioning

confidence: 92%

Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors

Kang

Huang

Geng³

et al. 2018

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“…MC displays a steep uptake below P/P 0 = 0.01 and subsequent saturated adsorption platform, indicating the existence of micropores in large quantity [26,27]. Figure 2(b) shows the pore size distribution (PSD) curves, MG-X display almost the same PSD with the MC's, the pore width range is less than 5 nm, while a remarkable increase happened to the pore volume that the relative pore width range is larger than 5 nm.…”

Section: Resultsmentioning

confidence: 97%

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Huang

Geng

Kang

et al. 2018

Journal of Nanomaterials

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Mesoporous graphene materials (MG-X) were prepared from potassium humate coupled with magnesium acetate. The freezedrying pretreatment and MgO particles not only prevent the agglomeration of graphene sheets and form mesopores but also help to reduce the oxygen content and enlarge the sp 2 carbon domain of MG-X. MG-X possess optimized characteristics including large specific surface area (>1100 m 2 ·g −1 ), high mesoporosity (~90%), and low oxygen content (~7%). When used as supercapacitor electrodes, MG-X demonstrate optimal electrochemical performances among all materials prepared here, such as high gravimetric capacitance (150 F·g −1 at high current density of 3.3 A·g −1) and enhanced rate capability with the capacitance retention of~80% from 0.041 to 3.3 A·g −1 . Moreover, MG-5 exhibits good cycling stability with a capacitance retention of 98.6% after 1000 cycles at 2.46 A·g −1 . This work provides a facile and efficient preparation method for mesoporous graphene materials used as supercapacitor electrodes.

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Porous carbon nanofiber mats from electrospun polyacrylonitrile/polymethylmethacrylate composite nanofibers for supercapacitor electrode materials

Song

Chen

et al. 2018

J Mater Sci

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Tailoring the textural properties of hierarchical porous carbons for supercapacitors

Cited by 12 publications

References 12 publications

Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors

Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Porous carbon nanofiber mats from electrospun polyacrylonitrile/polymethylmethacrylate composite nanofibers for supercapacitor electrode materials

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