Superior capacitive characteristics of RuO2 nanorods grown on carbon nanotubes

Lin, Yusheng; Lee, Kuei‐Yi; Chen, Kuei-Yu; Huang, Ying‐Sheng

doi:10.1016/j.apsusc.2009.08.026

Cited by 46 publications

(18 citation statements)

References 22 publications

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“…This differs from the symmetrical RuO 2 /graphene device in which the voltage drop is evenly divided by the two electrodes at any point of time during charge-discharge. RuO 2 has been shown to be a promising high energy density supercapacitor material, with the caveat of high cost [21,[26][27][28][29][30][31][32][33]. Compared to RuO 2 based supercapacitors reported previously [21,[27][28][29][30][31][32][33], including a RuO 2 /graphene-RuO 2 /graphene pair [21] and a RuO 2 -RuO 2 pair [31], our asymmetrical Ni(OH) 2 /graphene and RuO 2 /graphene supercapacitor shows higher electrochemical performance, especially in terms of higher energy densities (Fig.…”

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confidence: 89%

“…2(e), red data points). The specific capacitance values of our RuO 2 /graphene hybrid are highly competitive with other RuO 2 materials measured in alkaline electrolytes [26][27][28]. Although higher capacitances have been measured for RuO 2 in acidic electrolytes [21,[29][30][31][32][33], alkaline electrolytes are required by the Ni(OH) 2 /graphene hybrid, which is the counter electrode of RuO2/graphene in the asymmetrical supercapacitor as shown below.…”

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Advanced asymmetrical supercapacitors based on graphene hybrid materials

et al. 2011

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Supercapacitors operating in aqueous solutions are low cost energy storage devices with high cycling stability and fast charging and discharging capabilities, but generally suffer from low energy densities. Here, we grow Ni(OH) 2 nanoplates and RuO 2 nanoparticles on high quality graphene sheets in order to maximize the specific capacitances of these materials. We then pair up a Ni(OH) 2 /graphene electrode with a RuO 2 /graphene electrode to afford a high performance asymmetrical supercapacitor with high energy and power density operating in aqueous solutions at a voltage of ~1.5 V. The asymmetrical supercapacitor exhibits significantly higher energy densities than symmetrical RuO 2 -RuO 2 supercapacitors or asymmetrical supercapacitors based on either RuO 2 -carbon or Ni(OH) 2 -carbon electrode pairs. A high energy density of ~48 W·h/kg at a power density of ~0.23 kW/kg, and a high power density of ~21 kW/kg at an energy density of ~14 W·h/kg have been achieved with our Ni(OH) 2 /graphene and RuO 2 /graphene asymmetrical supercapacitor. Thus, pairing up metal-oxide/graphene and metal-hydroxide/graphene hybrid materials for asymmetrical supercapacitors represents a new approach to high performance energy storage.

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confidence: 89%

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Advanced asymmetrical supercapacitors based on graphene hybrid materials

et al. 2011

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“…Using a template method, the particle size of RuO 2 ÁxH 2 O can be controlled by altering the template size. Cui et ala n dL i net al 214,215 reported that nanostructured crystalline RuO 2 particles prepared using a SiO 2 hard template had a narrow size distribution. However, it should be noted that a hard template is often accompanied by a higher pyrolysis temperature, which can lead to well crystallized RuO 2 with a small amount of water, and a relatively low specific capacity of 229 F g À1 for 40 wt% Ru at 10 mV s…”

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confidence: 99%

“…For example, when KOH electrolyte concentration was higher than 0.5 M, the capacitance increased linearly with increasing KOH concentration, whereas when the concentration was lower than 0.5 M, the capacitance decreased sharply with declining concentration. 215 Therefore, the ionic concentration in electrolytes must match the needs of both the electrical double layer and the faradaic reactions. 235 The results demonstrated that the three-dimensional nanotube network of TiO 2 offered a solid support structure for Ru 1-y Cr y O 2 , allowing the active material to be readily available for electrochemical reactions while at the same time improving the active material's utilization.…”

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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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“…Different metal oxides such as RuO 2 , SnO 2 , Fe 3 O 4 and conducting polymers like polyaniline (PANI), polypyrole have been used with CNTs and graphene to improve energy density. [12][13][14][15][16] CNTs suffer with high cost and difficult to decorate with metal oxides nanoparticles due to tubular structure, while graphene suffers with restacking through the van der Waals interactions during the drying process applied in obtaining graphene. This stacking makes difficult for the ions to gain access to the inner layers to form electrochemical double layers and hence result in low capacitance.…”

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Hybrid carbon nanostructure assemblage for high performance pseudo-capacitors

Mishra

Ramaprabhu

2012

AIP Advances

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Investigation of novel nanocomposites for pseudo-capacitors with high capacitance and energy density is the spotlight of current energy research. In the present work, hybrid carbon nanostructure assemblage of graphene and multiwalled carbon nanotubes has been used as carbon support to nanostructured RuO2 and polyaniline for high energy supercapacitors. Maximum specific capacitances of 110, 235 and 440 F g−1 at the voltage sweep rate of 10 mV s−1 and maximum energy densities of 7, 12.5 and 20.5 Wh kg−1 were observed for carbon assemblage and its RuO2 and polyanilne decorated nanocomposites, respectively, with 1M H2SO4 as electrolyte.

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Superior capacitive characteristics of RuO2 nanorods grown on carbon nanotubes

Cited by 46 publications

References 22 publications

Advanced asymmetrical supercapacitors based on graphene hybrid materials

Advanced asymmetrical supercapacitors based on graphene hybrid materials

A review of electrode materials for electrochemical supercapacitors

Hybrid carbon nanostructure assemblage for high performance pseudo-capacitors

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