EDLC characteristics with high specific capacitance of the CNT electrodes grown on nanoporous alumina templates

Wen, Sun; Jung, Mi; Joo, Oh‐Shim; Mho, Sun‐il

doi:10.1016/j.cap.2005.07.008

Cited by 38 publications

(12 citation statements)

References 7 publications

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“…AAO templates have often been utilized for carbon nanotube growth [621,[631][632][633][634][635][636][637][638], while cylindrical carbon nanotubes with various diameters [631-637] and triangular [638] cross-sections have been 94j 1 Highly Ordered Anodic Porous Alumina Formation by Self-Organized Anodizing synthesized using the CVD approach. An array of parallel and multiwalled carbon nanotubes with uniform diameter and periodic arrangement was achieved by using the AAO template [4,634,635].…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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Section: Carbon Nanotubesmentioning

confidence: 99%

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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“…Lee and Pyun 2006;Lee et al 2004;Lee et al 2007;Leitner et al 2006;Li et al 2007;Liu et al 2006;Miller and Dunn 1999;Mitani et al 2006;Morishita et al 2007;Nam et al 2007;Nanbu et al 2006;Okajima et al 2005aOkajima et al , 2005bPollak et al 2007;Prasad et al 2004;Sugimoto et al 2005Sugimoto et al , 2006Tashima et al 2007;Toyoda et al 2004;Wan et al 2007; Wang and Xia 2005;Wang et al 2006;Wen et al 2006;Xing et al 2006;Xu et al 2007;Yamada et al 2007;Yang et al 2005;Zhou et al 2007;Zhu et al 2006;Zolfaghari et al 2007). Figures 1a-1c presents voltammetric curves for ideal capacitor (a), for ideal resistor (b), and a typical curve for actual (nonideal) electrochemical capacitor (c).…”

Section: Introductionmentioning

confidence: 94%

“…Usually the current is plotted as a function of voltage. In several publications, the quantities other than current, e.g., current per unit of mass (Chang and Hu 2006;Fischer et al 2007;Hu et al 2007aHu et al , 2007bHu et al , 2007cHuang et al 2007;Kim and Mitani 2006;Lee et al 2007;Mitani et al 2006;Nanbu et al 2006;Okajima et al 2005aOkajima et al , 2005bPrasad et al 2004;Sugimoto et al 2005;Toyoda et al 2004;Wen et al 2006;Xing et al 2006), current per unit of surface area (Chang and Hu 2006;Karandikar et al 2007;Lee and Pyun 2006;Yang et al 2005;Zhu et al 2006;Nam et al 2007) or capacitance per unit of mass (Barbieri et al 2005;Frackowiak et al 2002;Gryglewicz et al 2005;Jurewicz et al 2004;Lee et al 2004;Leitner et al 2006;Liu et al 2006;Okajima et al 2005aOkajima et al , 2005bPollak et al 2007;Sugimoto et al 2006) are plotted as a function of voltage. These quantities are obtained by multiplication of the current by a constant number, and as we show later, the method proposed in the present study applies for all these types of plots.…”

Section: Introductionmentioning

confidence: 99%

Quantitative assessment of hysteresis in voltammetric curves of electrochemical capacitors

2009

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A family of coefficients for quantitative assessment of hysteresis in cyclic voltammetric (CV) curves of electrochemical capacitors and of electrodes for electrochemical capacitors has been defined. Hysteresis index 1 (HI1) is based on the maximum in the difference in current measured at the same potential in ascending and descending branch of CV curve, and HI2 is based on the average difference in current measured at the same potential in ascending and descending branch of CV curve. The values of HI1 and HI2 range from 0 (no hysteresis) to 1 for an ideal capacitor. CV curves of two commercially available electrochemical capacitors over a potential range 0-1500 mV at scan rate of 5 mV/s showed HI1 of 0.94 and 0.97 and HI2 of 0.77 and 0.83, respectively. At the same experimental conditions, a series of 52 home made electrochemical capacitors showed HI1 up to 0.7 and HI2 up to 0.55. HI1 and HI2 measured at constant scan rate (5, 20 or 50 mV/s) in that series of capacitors showed a correlation coefficient >0.98 while HI1 and HI2 measured at different scan rates showed limited correlation. 98 CV curves of electrochemical capacitors and of electrodes for electrochemical capacitors from literature, obtained at various conditions show HI1 from 0.42 to 1, HI2 from 0.27 to 0.97, and a correlation coefficient of 0.90 between HI1 and HI2.

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“…Supercapacitors can be broken down into two categories. This is based on the charge storage mechanism: Electrochemical double layer capacitors (EDLCs) is usually exemplified by carbon materials and its derivates, such as carbon nanotube [11,12], fullerene [13,14], carbon fiber [15,16], activated carbon (AC) [17], and graphene oxide (GO) [18] in which charge can be stored via electrostatic accumulation of ions at the electrode/electrolyte interface, and on the other side, pseudo-capacitors based on metal oxides (NiO, Fe 3 O 4 , MnO 2, SnO 2 , etc) [19][20][21] and conducting polymers (PANI, PPy, etc) via fast and reversible redox faradaic reactions [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

High power density supercapacitor devices based on nickel foam–coated rGO/MnCo2O4 nanocomposites

Chebil

Kuzgun

Dridi

et al. 2020

Ionics

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New nanocomposite electrode material of rGO/MnCo 2 O 4 was freely loaded on flexible substrate on nickel foam and prepared by a simple, cost-effective, and eco-friendly pathway. The results show that the spinel manganese cobaltite (MnCo 2 O 4) with reduced graphene oxide (rGO) nanocomposite forms a uniform deposit and densely covers on the nickel foam (NF). The electrochemical measurements were investigated in three methods, such as cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The synergistic effects from rGO and MnCo 2 O 4 deliver outstanding an excellent electrochemical performance that was not realized by any of these components alone. The electroactive material exhibits a high specific capacitance of C sp = 808 F/g at 2 mV/s in 1 M KOH solution. Furthermore, this device delivers an excellent power density of P = 7658 W/kg and a high energy density of E = 15.2 Wh/kg. More importantly, cycling retention is 135% after 1000 charge/discharge cycles. This study proposes that the as-prepared (rGO/MnCo 2 O 4)/nickel foam has a potential application and a promising candidate for energy storage devices.

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EDLC characteristics with high specific capacitance of the CNT electrodes grown on nanoporous alumina templates

Cited by 38 publications

References 7 publications

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Quantitative assessment of hysteresis in voltammetric curves of electrochemical capacitors

High power density supercapacitor devices based on nickel foam–coated rGO/MnCo2O4 nanocomposites

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