Preparation of cobalt oxide thin films and its use in supercapacitor application

Kandalkar, S.G.; Gunjakar, Jayavant L.; Lokhande, C.D.

doi:10.1016/j.apsusc.2008.02.163

Cited by 270 publications

(116 citation statements)

References 18 publications

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“…To reduce the cost of RuO 2 some low cost metal oxides such as NiO, CoOx and MnO x etc. have been investigated as electrode materials for electrochemical capacitors [26,27]. Nano-composites of these metal oxides with high surface area carbon materials have been shown to enhance the capacitance as reported by Zheng et al [28].…”

Section: Introductionmentioning

confidence: 99%

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

Nwanya

Jafta

Ejikeme

et al. 2014

Electrochimica Acta

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Polyanine and its nanocomposite WO 3 /PANI films were deposited on Fluorine doped tin oxide (FTO) glass slides by simple Chemical Bath Deposition Method. The morphology and crystalline structure of the composite film was studied using Atomic force (AFM) and Scanning Electron Microscopy, while the electrochemical capacitive properties were determined using Cyclic Voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS). The WO 3 / PANI nano-composite exhibited multiple colors (electrochromism) during the CV scans, from brownish green to transparent to light green then back to brownish green. Surprisingly, the integration of the PANI with the WO 3 led to synergistic performance of nanohybrid wherein a true electrochemical double layer capacitor was obtained. Also, interestingly and unlike literature reports, the CBD method led to excellent capacitance retention (> 98%) of the PANI even at 1000 continuous cycles. This work demonstrates that simple CBD can be used to get WO 3 / PANI films that give good electrochromism and pseudocapacitance comparable to the ones obtained by other methods. Hence the obtained nanocomposite film of WO 3 / PANI can be a promising material for electrochromic and energy storage applications.

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Section: Introductionmentioning

confidence: 99%

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

Nwanya

Jafta

Ejikeme

et al. 2014

Electrochimica Acta

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“…that have the electrochemical signature of a capacitive electrode, i.e., a linear dependence of the charge stored with changing potential within the window of interest, but in which charge storage originates from electron-transfer mechanisms, rather than simply relying on the accumulation of ions in the electrochemical double layer (as with activated carbons). Despite this clear definition, many battery-type electrodes such as Ni(OH) 2 6,7 or other materials that exhibit faradaic behavior (even those that are electrochemically irreversible) 8,9 have been presented in the literature as pseudocapacitive materials, which leads to confusion for readers because the concept of "capacitance" (F) cannot apply to purely faradaic behavior, where "capacity" (coulomb, C, or mAh) is the most appropriate and meaningful metric to use in such cases.…”

mentioning

confidence: 99%

To Be or Not To Be Pseudocapacitive?

Brousse

Bélanger

Long

2015

J. Electrochem. Soc.

2,234

1,107

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There are an increasing number of studies regarding active electrode materials that undergo faradaic reactions but are used for electrochemical capacitor applications. Unfortunately, some of these materials are described as "pseudocapacitive" materials despite the fact that their electrochemical signature (e.g., cyclic voltammogram and charge/discharge curve) is analogous to that of a "battery" material, as commonly observed for Ni(OH) 2 and cobalt oxides in KOH electrolyte. Conversely, true pseudocapacitive electrode materials such as MnO 2 display electrochemical behavior typical of that observed for a capacitive carbon electrode. The difference between these two classes of materials will be explained, and we demonstrate why it is inappropriate to describe nickel oxide or hydroxide and cobalt oxide/hydroxide as pseudocapacitive electrode materials.

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“…18, 19 Hu and Cheng 21 demonstrated that binary hydrous Co-Ni oxide showed a large capacitance of ca. 730 F g −1 at 25 mV s −1 and 4 o C, due to its highly porous nature.…”

mentioning

confidence: 99%

“…Nickel oxide, 9-13 cobalt oxide, [14][15][16][17][18][19] and Co-Ni mixed oxide 20,21 have been studied as alternative electrode materials to RuO 2 . Nickel oxide was seen as a possibility to improve the capacitance and to enhance charge-storage capability by the control of surface morphology.…”

mentioning

confidence: 99%

Supercapacitive Properties of Co-Ni Mixed Oxide Electrode Adopting the Nickel Foam as a Current Collector

Cho¹,

Nam²,

Park³

et al. 2012

Bulletin of the Korean Chemical Society

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Three-dimensional porous nickel foam was used as a current collector to prepare a Co-Ni oxide/Ni foam electrode for a supercapacitor. The synthesized Co-Ni oxide was proven to consist of mixed oxide phases of Co 3 O 4 and NiO. The Co-Ni oxide/Ni foam electrode prepared was characterized by morphological observation, crystalline property analysis, cyclic voltammetry, and impedance spectroscopy. Cyclic voltammetry for the electrode showed high specific capacitances, such as 936 F g −1 at 5 mV s −1 and 566 F g −1 at 200 mV s, and a comparatively good cycle performance. These improved results were mainly due to the dimensional stability of the nickel foam and its high electrical contact between the electrode material and the current collector substrate.

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Preparation of cobalt oxide thin films and its use in supercapacitor application

Cited by 270 publications

References 18 publications

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

To Be or Not To Be Pseudocapacitive?

Supercapacitive Properties of Co-Ni Mixed Oxide Electrode Adopting the Nickel Foam as a Current Collector

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