Preparation of Ruthenic Acid Nanosheets and Utilization of Its Interlayer Surface for Electrochemical Energy Storage

Sugimoto, Wataru; Iwata, Hidehisa; Yasunaga, Yutaka; Murakami, Yasushi; Takasu, Yoshio

doi:10.1002/anie.200351691

Cited by 535 publications

(367 citation statements)

References 22 publications

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“…RuO2ns is very stable under electrochemical conditions similar to what has been applied in this study [21,22]. This is also clear from the almost constant redox peaks attributed to RuO2ns (E1/2= 0.13 and 0.65 V vs. RHE) before and after ADT.…”

Section: Resultssupporting

confidence: 69%

Improving oxygen reduction reaction activity and durability of 1.5nm Pt by addition of ruthenium oxide nanosheets

Takimoto

Chauvin

Sugimoto

2013

Electrochemistry Communications

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The durability of commercial carbon supported Pt nanoparticles with average particle size of 1.5 nm (20 mass% Pt/C) has been improved by the addition of ruthenium oxide nanosheets (RuO2ns) without sacrificing the initial activity towards oxygen reduction reaction.The initial oxygen reduction reaction activity of the composite catalyst was slightly higher than as-received Pt/C. The electrocatalytic activity after consecutive potential cycling tests of the composite catalyst was c.a. 1.3 times higher than non-modified Pt/C. The increased durability of the composite catalyst is attributed to the improved preservation of the electrochemically active Pt surface area with the addition of ruthenium oxide.

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Section: Resultssupporting

confidence: 69%

Improving oxygen reduction reaction activity and durability of 1.5nm Pt by addition of ruthenium oxide nanosheets

Takimoto

Chauvin

Sugimoto

2013

Electrochemistry Communications

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“…[1][2][3][4][5][6] Nanostructured electrode materials are key components in the advancement of future energy technologies; thus, strategies for preparing high-performance nanomaterials are required. 5 However, direct synthesis of complex nanostructures still remains a challenge in areas of materials science.…”

mentioning

confidence: 99%

Growth of Manganese Oxide Nanoflowers on Vertically-Aligned Carbon Nanotube Arrays for High-Rate Electrochemical Capacitive Energy Storage

et al. 2008

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Manganese oxide nanoflower/carbon nanotube array (CNTA) composite electrodes with hierarchical porous structure, large surface area, and superior conductivity was controllable prepared by combining electrodeposition technique and a vertically aligned CNTA framework. This binder-free manganese oxide/CNTA electrode presents excellent rate capability (50.8% capacity retention at 77 A/g), high capacitance (199 F/g and 305 F/cm 3 ), and long cycle life (3% capacity loss after 20 000 charge/discharge cycles), with strong promise for high-rate electrochemical capacitive energy storage applications.In development of energy storage devices, nanostructured electrode materials have attracted great interest, as they show not only higher capacities but also better rates than traditional materials. 1-6 Nanostructured electrode materials are key components in the advancement of future energy technologies; thus, strategies for preparing high-performance nanomaterials are required. 5 However, direct synthesis of complex nanostructures still remains a challenge in areas of materials science. 7,8 Nowadays, much research on electrochemical capacitors (ECs) is aimed at increasing power and energy densities as well as lowering fabrication costs while using environmentally friendly materials. Specifically, it was found that RuO 2 exhibits prominent capacitive properties as ECs electrode materials; 9 however, its high cost excludes it from wide application. Relatively low cost materials such as MnO x and NiO x can also be used as electrode materials, but their poor rate capability need to be enhanced. 10,11 Manganese oxides (MO) have been thoroughly investigated because of their importance in industrial applications, such as catalysis and energy storage. [12][13][14][15][16] Over the years various nanostructured manganese oxides, including dendritic clusters, nanocrystals with different shapes, nanowires, nanotubes, nanobelts, and nanoflowers, have been synthesized. [17][18][19][20][21][22][23][24] In order to greatly increase electrochemical performance of manganese oxides, a hierarchical porous structure 25 with high electronic conductivity 26 must be considered. Nevertheless, up to now, no method has been reported to fabricate hierarchical porous and binder-free manganese oxide composite electrodes with superior electronic conductive paths. In this paper, we realized this goal by a combination of a carbon nanotube array (CNTA) framework and an electrodeposition technique to fabricate a composite structure, that is, well-dispersed manganese oxide nanoflowers on a vertically aligned CNTA. CNTA is excellent for electrodepositing transition metal oxides because of its regular pore structure, high surface area, homogeneous property (binderfree), and excellent conductivity. [27][28][29][30] The experimental results show that the manganese oxide/CNTA composite electrode exhibits superior rate performance (50.8% capacitance retention at 77 A/g) in an EC, thus, making it very promising for high-rate electrochemical capacitive energy ...

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“…Many of these compounds display redox properties resulting in levels of Faradaic-or pseudo-capacitances much higher than those achievable from electrochemical double layer effects alone. [22][23][24] Indeed, the theoretical pseudocapacitance of MnO2 is 1370 F/g, which is extremely high. 25 Moreover, a growing selection of layered oxides and hydroxides are showing great promise in this area.…”

mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nano-platelets by the addition of carbon nanotubes. Electrodes based on MnO2 nano-platelets do not display high areal capacitance because the electrical properties of such films are poor, limiting the transport of charge between redox sites and the external circuit.In addition, the mechanical strength is low, limiting the achievable electrode thickness, even in the presence of binders. By adding carbon nanotubes to the MnO2-based electrodes, we have increased the conductivity by up to eight orders of magnitude, in line with percolation theory.The nanotube network facilitates charge transport, resulting in large increases in capacitance, especially at high rates, around 1 V/s. The increase in MnO2 specific capacitance scaled with nanotube content in a manner fully consistent with percolation theory. Importantly, the mechanical robustness was significantly enhanced, allowing the fabrication of electrodes that were 10 times thicker than could be achieved in MnO2-only films. This resulted in composite films with areal capacitances up to 40 times higher than could be achieved with MnO2-only electrodes.

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Preparation of Ruthenic Acid Nanosheets and Utilization of Its Interlayer Surface for Electrochemical Energy Storage

Cited by 535 publications

References 22 publications

Improving oxygen reduction reaction activity and durability of 1.5nm Pt by addition of ruthenium oxide nanosheets

Improving oxygen reduction reaction activity and durability of 1.5nm Pt by addition of ruthenium oxide nanosheets

Growth of Manganese Oxide Nanoflowers on Vertically-Aligned Carbon Nanotube Arrays for High-Rate Electrochemical Capacitive Energy Storage

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

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