Electric double layer capacitors based on a composite electrode of activated mesophase pitch and carbon nanotubes

Huang, Cheng; Hsieh, Chien Te; Kuo, Ping Lin; Teng, Hsisheng

doi:10.1039/c2jm15645h

Cited by 78 publications

(39 citation statements)

References 54 publications

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“…The Ragone plot given in Figure 3g compares the energy density and power density of a PEA-Zn-700-40 electrode based on active material loading in a two-electrode cell with those of the other carbon materials. [43,55,58,[59][60][61][62][63][64][65][66][67][68][69][70] At a long current drain time of 310 s, the values of the energy and power densities of PEA-Zn-700-40 based capacitor are 10.3 Wh kg -1 and 122 W kg -1 , respectively, and at a time of 3.6 s, E = 4.89 Wh kg -1 , P = 4903 W kg -1 . It is clear that PEA-Zn-700-40 exhibits much better in terms of both energy density and power density than other common ACs.…”

Section: Resultsmentioning

confidence: 99%

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

et al. 2016

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A series of nitrogen and oxygen enriched porous carbons are prepared from poly-N-phenylethanolamine (PNPEA) and polyaniline (PANI) conducting polymers through pyrolysis, chemical activation, and oxidation processes. Ar or N 2 -adsorption, FT-IR, and X-ray photoelectron spectroscopy are used to characterize the surface areas, pore volumes, surface chemical compositions, and oxygen and nitrogen content. Mikhail and Brunauer micropore analytical method (MP method) is successfully used to analyze the micropore size distribution of the samples. The electrochemical behaviour of the samples is studied in two-and three-electrode cells. The contribution of pseudocapacitance is confirmed by cyclic voltammetry and galvanostatic tests performed in acidic (H 2 SO 4 ) and basic (KOH) media. The potential drop and the equivalent series resistance value certify that the samples with wide micropore size distribution possess low interface resistances. A sample with a BET surface area of 760 m 2 g -1 , nitrogen content of 3.02 at.%, oxygen content of 16.65 at.%, and a wide micropore size distribution, presents the best performance, reaching a value of 370 F g -1 at 0.5 A g -1 and 248 F g -1 at 30 A g -1 , and maintaining capacitance retention ration of 96% at 1 A g -1 (over 1000 cycles) and 92% at 30 A g -1 (over 10000 cycles), respectively. The results obtained for all the samples agree with correlation among capacitance, functional group, and porosity, which indicates that an appropriate selection of the surface chemistry, a reasonable pore size distribution, and a moderate BET surface area, may be promising to achieve high-rate-performance supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

et al. 2016

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“…The electrode processing conditions have also been shown to have a significant effect on the EDLC performance [11][12][13][14][15][16][17][18]28]. For example, forced electrolyte infiltration was found to overcome, to some extent, the capacitance retention problem at high current densities associated with primarily microporous carbons [28].…”

Section: Introductionmentioning

confidence: 97%

“…Recently, there has been considerable attention devoted towards understanding and tailoring the material properties [1][2][3][4][5][6][7][8][9][10] and electrode processing conditions [11][12][13][14][15][16][17][18] to enhance the performance of porous carbons used as electrode materials for supercapacitors. Among the various carbon material properties, the pore size distribution has been shown to play a very significant role [1][2][3][4][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A combined salt–hard templating approach for synthesis of multi-modal porous carbons used for probing the simultaneous effects of porosity and electrode engineering on EDLC performance

Bhandari

Dua

Estevez

et al. 2015

Carbon

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A B S T R A C TA new approach, based on a combination of salt and hard templating for producing multimodal porous carbons is demonstrated. The hard template, silica nanoparticles, generate mesopores ($22 nm), and in some cases borderline-macropores ($64 nm), resulting in high pore volume ($3.9 cm 3 /g) while the salt template, zinc chloride, generates borderline-mesopores ($2 nm), thus imparting high surface area ($2100 m 2 /g). The versatility of the proposed synthesis technique is demonstrated using: (i) dual salt templates with hard template resulting in magnetic, nanostructured-clay embedded ($27% clay content), high surface area ($1527 m 2 /g) bimodal carbons ($2 and 70 nm pores), (ii) multiple hard templates with salt template resulting in tri-modal carbons ($2, 12 and 28 nm pores), (iii) low temperature (450°C) synthesis of bimodal carbons afforded by the presence of hygroscopic salt template, (iv) easy coupling with physical activation approaches. A selected set of thus synthesized carbons were used to evaluate, for the first time, the simultaneous effects of carbon porosity and pressure applied during electrode fabrication on EDLC performance. Electrode pressing was found to be more favorable for carbons containing hard-templated mesopores ($87% capacitance retention at current density of 40 A/g) as compared to those without ($54% capacitance retention).

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“…Wh kg -1 ) [6], activated carbon (< 10 Wh kg -1 ) [63,64], carbon nanotube (< 10 Wh kg -1 ) [65,66] and graphene (< 4 Wh kg -1 ) [67] in aqueous electrolyte, CNW2-2 sample shows outstanding performance. In summary, these above analyses indicate that the optimal voltage window of the CNW2-2 sample in two-electrode systems is 0-1.5 V, a very suitable range for supercapacitors.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Nitrogen doped carbon nanowires prepared from polypyrrole nanowires for potential application in supercapacitors

Wang

Qiu

et al. 2016

Journal of Electroanalytical Chemistry

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Electric double layer capacitors based on a composite electrode of activated mesophase pitch and carbon nanotubes

Cited by 78 publications

References 54 publications

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

A combined salt–hard templating approach for synthesis of multi-modal porous carbons used for probing the simultaneous effects of porosity and electrode engineering on EDLC performance

Nitrogen doped carbon nanowires prepared from polypyrrole nanowires for potential application in supercapacitors

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