Mesoporous anhydrous RuO2 as a supercapacitor electrode material

Subramanian, Vivek; Hall, Sean C.; Smith, Patricia H.; Rambabu, B.

doi:10.1016/j.ssi.2004.01.070

Cited by 255 publications

(129 citation statements)

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“…Generally, a supercapacitor is based on the electrical double layers formed along carbon electrodes, which may provide capacitance of up to 300 F/g in an aqueous electrolyte [8,9]. Oxides of transition metals, such as RuO2 [10][11][12], MnO 2 [13][14][15][16], NiO [17,18], Co 3 O 4 [19], and V 2 O 5 [20,21], possess significantly higher capacitances; however, harvesting such capacitance has been limited by their low conductivity and redox kinetics. To address such intrinsic limitations, a common strategy is to integrate low-dimensional oxide materials with conductive components, such as carbon, which has led to the development of various nanocomposites with significantly improved energy density [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical manganese oxide/carbon nanocomposites for supercapacitor electrodes

et al. 2010

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MnO 2 /carbon nanocomposites with hierarchical pore structure and controllable MnO 2 loading have been synthesized using a self-limiting growth method. This was achieved by the redox reactions of KMnO 4 with sacrificed carbon substrates that contain hierarchical pores. The unique pore structure allows the synthesis of nanocomposites with tunable MnO 2 loading up to 83 wt.%. The specific capacitance of the nanocomposites increased with the MnO 2 loading; the conductivity measured by electrochemical impedance spectroscopy, on the other hand, decreased with increasing MnO 2 loading. Optimization of the MnO 2 loading resulted in nanocomposites with high specific capacitance and excellent rate capability. This work provides important fundamental understanding which will facilitate the design and fabrication of high-performance supercapacitor materials for a large variety of applications.

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Section: Introductionmentioning

confidence: 99%

Hierarchical manganese oxide/carbon nanocomposites for supercapacitor electrodes

et al. 2010

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“…21,195,200,201,210 The presence of ordered nanopores can also lead to better electrolyte diffusion into the electrode material and then improve the completion of the redox reaction, resulting in higher pseudocapacitance. 211 The particle size of RuO 2 ÁxH 2 O can be controlled in different ways, depending on the preparation method. Using a colloidal method, the particle size of RuO 2 ÁxH 2 O can be altered by the amount of NaHCO 3 and the reaction time.…”

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confidence: 99%

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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“…The major difference with other methods that have employed templates is that the present procedure does not involve any heat treatment to remove the template. Such treatment would results in pore collapse, particle ripening, and loss of intra-particle water, in turn leading to smaller surface area and specific capacitance [43] [44]. The specific capacitance is unfortunately smaller than reported values for RuO 2 •nH 2 O prepared by sol-gel synthesis [25,26], most likely due to the larger primary particle size of RuO x (2 to 3 nm in diameter) constituting the walls and possible incomplete oxidation.…”

Section: Resultsmentioning

confidence: 91%

“…Surfactant assisted synthesis of ordered mesoporous RuO 2 have so far lead to material with substantially low capacitance values, i.e. 100 F g -1 [43], [44], which is likely due to particle ripening and pore collapse due to post heat treatment. Two studies have succeeded in the synthesis of high capacitance mesoporous RuO2, albeit with poorly or no ordered structures [45], [46].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area

Sugimoto

Makino

Mukai

et al. 2012

Journal of Power Sources

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In ordered to prepare high capacitance pseudo-capacitive oxides, it is important to design nanostructures with appreciable mesopores. Supramolecular templating has become a popular method to synthesize ordered mesoporous metals; however, the application of the same technique to synthesis of high surface area oxides is more demanding. We present here, the synthesis of ordered mesoporous ruthenium metal by lyotropic liquid crystal templating and its electrochemical conversion to ordered mesoporous ruthenium oxide by a simple, room temperature procedure. The bulk, unsupported metallic ordered mesoporous ruthenium exhibits high surface area of 110 m 2 g -1 , which is comparable to typical supported Ru nanoparticles. The oxide analogue gives a high specific capacitance of 376 F g -1 , owing to the porous structure. These results demonstrate a possible facile and generic process to synthesize oxides with ordered nanostructures by utilization of the various phases that can be obtained with lyotropic liquid crystalline templates such as cubic, hexagonal, lamellar, etc. comparable to state-of-the-art, supported ruthenium nanoparticles.► Ordered mesoporous ruthenium was electrochemically converted to its oxide analogue, with high specific capacitance.

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Mesoporous anhydrous RuO2 as a supercapacitor electrode material

Cited by 255 publications

References 8 publications

Hierarchical manganese oxide/carbon nanocomposites for supercapacitor electrodes

Hierarchical manganese oxide/carbon nanocomposites for supercapacitor electrodes

A review of electrode materials for electrochemical supercapacitors

Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area

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