Electrochemical characterization on MnFe2O4/carbon black composite aqueous supercapacitors

Kuo, Shin-Liang; Wu, Nae‐Lih

doi:10.1016/j.jpowsour.2006.07.056

Cited by 96 publications

(43 citation statements)

References 17 publications

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“…472 It exhibits high power delivering capability and superior cycling stability in aqueous electrolytes. 473,474 This nanocrystalline MnFe 2 O 4 , acting as an anode material, showed a specific capacitance of 99 F g À1 . 472 An LiMn 2 O 4 cathode showed a specific capacity of 130-100 mA h g À1 at 10-100 C rate within À0.3-0.9 V (vs. Ag/AgCl/saturated KCl (aq.)…”

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confidence: 99%

“…The most important feature of the supporting strategy is that these conductive supports can form a three-dimensional porous conducting network to effectively assist electron transfer and ion transport within MnO x . 22,51,281,333,335,347,[350][351][352][353][354][355][356][357][358][359][360] For instance, a rectangular shape in a cyclic voltammogram 361 and a volumetric specific capacitance of 253 F cm À3 can be obtained from a manganese oxide/carbon composite electrode. 362 Mn oxide/CNT composite electrodes 355 particles were partially coated on the surfaces of MCNTs through a hydrothermal process, a specific capacitance of 550 F g À1 was obtained.…”

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A review of electrode materials for electrochemical supercapacitors

2012

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=72117dd4-3024-4aa6-be53-472cfb3e5a2a http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=72117dd4-3024-4aa6-be53-472cfb3e5a2a In this critical review, metal oxides-based materials for electrochemical supercapacitor (ES) electrodes are reviewed in detail together with a brief review of carbon materials and conducting polymers. Their advantages, disadvantages, and performance in ES electrodes are discussed through extensive analysis of the literature, and new trends in material development are also reviewed. Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density of ES (476 references).

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A review of electrode materials for electrochemical supercapacitors

2012

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“…So that, even that the voltammograms do not show current peaks, it does not mean that the material does not change its oxidation state. 40,41 Specific capacitance (C) values have been calculated according to equation 1:…”

Section: Wettability Studiesmentioning

confidence: 99%

Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

Benedetti¹,

Petri²,

Torresi³

et al. 2010

J. Braz. Chem. Soc.

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Eletrodos macroporosos de MnO 2 foram preparados por eletrodeposição assistida por molde de partículas esféricas coloidais de poliestireno. A molhabilidade desses filmes foi estudada por medidas de ângulo de contato. Medidas de voltametria cíclica foram realizadas com o objetivo de estudar o seu comportamento como eletrodo para supercapacitores. A capacitância específica obtida foi cerca de 60% maior que a obtida por um eletrodo liso, o que mostra que apesar de a molhabilidade do eletrodo macroporoso ser menor, ocorre alguma penetração do eletrólito pelos poros, aumentando a área eletroativa. Por fim, o eletrodo macroporoso apresentou excelente establidade eletroquímica, não sendo observada queda de capacitância após 1000 ciclos de carga e descarga.Macroporous MnO 2 electrodes prepared by template-assisted electrodeposition using spherical polystyrene colloidal particles are studied. The wettability of such electrodes by a LiClO 4 aqueous electrolyte is measured by the contact angle technique. Cyclic voltammetry experiments are performed in order to evaluate the use of these electrodes for electrochemical capacitor applications. The specific capacity obtained is about 60% higher than that obtained for flat MnO 2 surfaces showing that, in spite of the wettability being lower, some penetration of the electrolyte into the pores must occur, increasing the electroactive area with respect to the flat electrode. Furthermore, the macroporous electrode showed excellent electrochemical stability, with neither a capacitance decrease nor a loss of morphology, after 1000 cycles.Keywords: supercapacitors, manganese oxide, porous electrodes, template assisted electro deposition, wettability IntroductionLi-ion batteries are widely used as energy sources for portable electronic devices, and several studies have been carried out in order to improve their performance.1 As charge/discharge processes are limited by reaction kinetics, 2 the search for devices that can deliver high power is an active field. Electrochemical capacitors or supercapacitors are high power sources that can be fully charged/discharged in seconds because they are based on surface faradaic reactions and/or double-layer capacitance.3,4 These devices can be applied together with a battery in order to allow both high energy and power or to replace conventional capacitors based on electrical charge separation. The preparation of high surface area electrodes can improve device performance because more material is available on the surface for charge compensation as well as for energy storage. 2Concerning redox-active materials for supercapacitors, RuO 2 presents the best capacitance values. However, its high cost does not allow its use in practical applications. 5 An alternative low cost, non toxic and environmentally friend material is MnO 2 .6-9 The electrochemical performance of MnO 2 -based supercapacitors and the mechanism of energy storage depend on several aspects, such as morphology, 10,11 structure 12,13 and post synthesis thermal treatment. 14 The major in...

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“…In order to increase the performance of supercapacitors, various permutations and combinations of metal compounds and other organic and inorganic moieties have been investigated [6][7][8][9][10][11][12][13][14][15][16][17][18]. Such materials are added either in situ during synthesis or mixed during the electrode preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Other examples are Vapor Grown Carbon Fiber (VGCF)/ RuO 2 ÁxH 2 O [12], Carbon nanotubes (CNT)/MnO 2 [13][14][15][16], MnO 2 ÁxH 2 O/Carbon Resorcinol Formaldehyde (CRF) [17], and NiO/CNT [6]. Other binary metal compounds and carbon have been reported, such as MnFe 2 O 4 /carbon black [18].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ni/Mn compounds/ordered mesoporous carbon composite for use in an electrochemical supercapacitor

et al. 2011

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The electrochemical behavior of a series of composites synthesized by a combination of incipient wetness impregnation and hydrothermal method for the first time is systematically compared (using cyclic voltammetric and electrochemical impedance spectroscopic analyses). Structural and morphological characterizations of the composites were undertaken using power X-ray diffraction (XRD), N 2 adsorption/desorption isotherms and transmission electron microscopy (TEM). The results indicated that the binary nickel/manganese compounds of the Ni-Mn/ordered mesoporous carbon (OMC) composite had a synergistic effect of both components.

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Electrochemical characterization on MnFe2O4/carbon black composite aqueous supercapacitors

Cited by 96 publications

References 17 publications

A review of electrode materials for electrochemical supercapacitors

A review of electrode materials for electrochemical supercapacitors

Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

Preparation of Ni/Mn compounds/ordered mesoporous carbon composite for use in an electrochemical supercapacitor

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