RuO<sub>2</sub>·nH<sub>2</sub>O Nanoparticles Anchored on Carbon Nano-onions: An Efficient Electrode for Solid State Flexible Electrochemical Supercapacitor

Muniraj, Vedi Kuyil Azhagan; Kamaja, Chaitanya Krishna; Shelke, Manjusha V.

doi:10.1021/acssuschemeng.5b01627

Cited by 108 publications

(58 citation statements)

References 26 publications

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“…Figure S7c (Supporting Information) shows a typical Ru3p 1/2 peak at 485 eV and Ru3p 3/2 peak at 462.5 eV from RuO 2 . The Ru3p 3/2 peak can be deconvoluted into two peaks at 462.3 eV from RuO 2 and 464.0 eV from Ru(OH) 2 . Overall, the XPS results suggest that nano‐RuO 2 particles formed in the fibers are in hydrated form (RuO 2 · x H 2 O), which is beneficial for charge storage and ionic transport …”

Section: Resultsmentioning

confidence: 92%

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Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Zhai

Wang

Karahan

et al. 2018

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119

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Compactness and versatility of fiber-based micro-supercapacitors (FMSCs) make them promising for emerging wearable electronic devices as energy storage solutions. But, increasing the energy storage capacity of microscale fiber electrodes, while retaining their high power density, remains a significant challenge. Here, this issue is addressed by incorporating ultrahigh mass loading of ruthenium oxide (RuO ) nanoparticles (up to 42.5 wt%) uniformly on nanocarbon-based microfibers composed largely of holey reduced graphene oxide (HrGO) with a lower amount of single-walled carbon nanotubes as nanospacers. This facile approach involes (1) space-confined hydrothermal assembly of highly porous but 3D interconnected carbon structure, (2) impregnating wet carbon structures with aqueous Ru ions, and (3) anchoring RuO nanoparticles on HrGO surfaces. Solid-state FMSCs assembled using those fibers demonstrate a specific volumetric capacitance of 199 F cm at 2 mV s . Fabricated FMSCs also deliver an ultrahigh energy density of 27.3 mWh cm , the highest among those reported for FMSCs to date. Furthermore, integrating 20 pieces of FMSCs with two commercial flexible solar cells as a self-powering energy system, a light-emitting diode panel can be lit up stably. The current work highlights the excellent potential of nano-RuO -decorated HrGO composite fibers for constructing micro-supercapacitors with high energy density for wearable electronic devices.

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Section: Resultsmentioning

confidence: 92%

“…And importantly, no crystalline diffraction peaks from RuO 2 (e.g., JCPDS file 40‐1290) were observed, even though the mass loading is high, which suggests that amorphous RuO 2 was formed in the fiber. Previous studies have reported that amorphous RuO 2 possesses higher capacitance than its crystalline structure …”

Section: Resultsmentioning

confidence: 95%

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Zhai

Wang

Karahan

et al. 2018

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119

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“…The obtained monolith was taken and washed thoroughly with distilled water before using it further. Of note, it is important to maintain the right ratio of Ni(OH) 2 and GS for being used as a good supercapacitor electrode since the capacitance is different for each of the individual constituents, the GS contributing much less toward the overall capacitance. In this study, two samples with graphene contents of 16.5% and 24.9% were prepared.…”

Section: ■ Experimental Proceduresmentioning

confidence: 99%

“…1,2 In comparison with the widely used and common double-layer capacitors, pseudocapacitors (for example, metal oxide, metal hydroxide, and polymers) have higher specific capacitance, as a result of which they are widely explored and considered for supercapacitor applications. 3−5 But, the use of these materials has been disadvantaged by their low cyclic stability and rate capability, due to the low conductivity of these materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Ni(OH)₂ Nanoflowers/Graphene Hydrogels: A New Assembly for Supercapacitors

Wang

Jayakumar

Xu³

et al. 2016

ACS Sustainable Chem. Eng.

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A novel structure of graphene-based hybrid hydrogels was constructed, in which α-Ni(OH) 2 nanoflowers with nanopetals thicknesses of approximately 20 nm were uniformly anchored on a three-dimensional graphene framework. Benefiting from the unique morphological nickel hydroxide nanoflowers and hydrogels, the nickel hydroxide nanoflowers/ graphene hydrogels exhibited great specific capacitances (1 A·g −1 ; 1632 F·g −1 ), great rate capabilities, and longer cycle life (after 1000 cycles, 95.2% capacitance retention) when used as electrodes in supercapacitors. ■ INTRODUCTIONSupercapacitors or ultracapacitors are emerging as the sustainable energy storage systems of the future for varied large-scale applications, mostly in portable electronics, biomedical devices, electric vehicles, and high power applications and so on. 1,2 In comparison with the widely used and common double-layer capacitors, pseudocapacitors (for example, metal oxide, metal hydroxide, and polymers) have higher specific capacitance, as a result of which they are widely explored and considered for supercapacitor applications. 3−5 But, the use of these materials has been disadvantaged by their low cyclic stability and rate capability, due to the low conductivity of these materials.Graphene (GS), has attractive characteristic properties, which makes it an outstanding material compared to many other carbonaceous materials; its excellent characteristic properties of high surface area and attractive electromechanical properties makes it the right material which can be used as a supporting surface for anchoring pseudocapacitive materials to improve both the overall capacitance and cycling stability. Though numerous graphene-based composites that were developed to date have succeeded in effectively improving the overall capacitive performance, many a time, the irreversible and unfavorable restacking of the graphene layers has led to a drastic decrease in the surface area, thereby limiting the free crusade of electron and ions. 6−8 Porosity being one of the vital factors influencing the capacitive performance of electrode materials, graphene-based mesoporous materials, such as graphene-based foams, aerogels, and hydrogels, have been able to attract substantial interest. 9−11 Graphene-based hybrid hydrogels belong to a class of hydrated materials containing a large amount of water, which have received particular attention in the recent times. 12,13 On one hand, the hydrogels have the advantage of being used as electrode materials without a binder, resulting in the reduction in the electrode preparation steps, and also any reduction in the specific capacitance caused by polymer binders used in the slurry preparation for the electrode material. On the other hand, these unique graphene-based hybrid hydrogels are highly hydrophilic in nature and have a high surface area (∼1000 m 2 · g −1 as per methylene blue molecular adsorption studies), allowing fast ion diffusions and electron transport through the hierarchical, porous and conductive graphene hydrogel network...

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“…are still being extensively investigated at present. As typical electrode active species, RuO 2 is the most promising pseudocapacitive electrode material among the transition metals with remarkably high specific capacitance, high chemical and thermal stability, and good electrochemical redox properties, then their hybrid such as RuO 2 /reduced grapheme [33], RuO 2 ·nH 2 O/carbon nano-onions [34], RuO 2 /CNFs [35], etc. are also developed to get reasonable structure and improve their performance.…”

Section: Carbon-based Materials For Pseudocapacitorsmentioning

confidence: 99%

Carbon-Based Electrode Materials for Supercapacitor: Progress, Challenges and Prospective Solutions

Jian¹,

Liu²,

Gao³

et al. 2016

JEE

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Carbon-based materials are typical and commercially active electrode for supercapacitors due to their advantages such as low cost, good stability and easy availability. In the light of energy storage, supercapacitors mechanism is classified into EDLCs (electrochemical double layer capacitors) and pseudocapacitors. Multidimensional carbon nanomaterials (active carbon, carbon nanotube, graphene, etc.), carbon-based composite and corresponding electrolyte are the critical and important factor in the eyes of researcher. In this minireview, we will discuss the storage mechanism and summarize recent developed novel carbon and carbon-based materials in supercapacitors. The techniques to design the novel nanostructure and high performance electrodematerials that facilitate charge transfer to achieve high energy and power densities will also be discussed.

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RuO₂·nH₂O Nanoparticles Anchored on Carbon Nano-onions: An Efficient Electrode for Solid State Flexible Electrochemical Supercapacitor

Cited by 108 publications

References 26 publications

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Ni(OH)₂ Nanoflowers/Graphene Hydrogels: A New Assembly for Supercapacitors

Carbon-Based Electrode Materials for Supercapacitor: Progress, Challenges and Prospective Solutions

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RuO2·nH2O Nanoparticles Anchored on Carbon Nano-onions: An Efficient Electrode for Solid State Flexible Electrochemical Supercapacitor

Cited by 108 publications

References 26 publications

Nano‐RuO2‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Nano‐RuO2‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Ni(OH)2 Nanoflowers/Graphene Hydrogels: A New Assembly for Supercapacitors

Carbon-Based Electrode Materials for Supercapacitor: Progress, Challenges and Prospective Solutions

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RuO₂·nH₂O Nanoparticles Anchored on Carbon Nano-onions: An Efficient Electrode for Solid State Flexible Electrochemical Supercapacitor

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Ni(OH)₂ Nanoflowers/Graphene Hydrogels: A New Assembly for Supercapacitors