Electrodeposited ruthenium oxide thin films for supercapacitor: Effect of surface treatments

Patake, V.D.; Lokhande, C.D.; Joo, Oh‐Shim

doi:10.1016/j.apsusc.2008.11.005

Cited by 166 publications

(63 citation statements)

References 17 publications

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“…In particular, the specific capacitance value for the supercapacitors based on hNiO-RuO 2 /CNT electrode can reach 947.1 F g −1 (based on total mass of metal oxides) at scan rate of 20 mV s −1 . This value is much higher than the recent data reported for RuO 2 Figure 5 Cyclic voltammograms of hCoO-RuO2 (a1, c1), hCuO-RuO2 (a2, c2), hFe2O3-RuO2 (a3, c3), hNiO-RuO2 (a4, c4), hCu0.6Ni0.4O-RuO2 (a5, c5), and commercial RuO2 (a6, c6) supported on carbon (a1, a2, a3, a4, a5, a6) and carbon nanotubes (c1, c2, c3, c4, c5, c6) at different scan rates; galvanostatic chargedischarge curves of hCoO-RuO2 (b1, d1), hCuO-RuO2 (b2, d2), hFe2O3-RuO2 (b3, d3), hNiO-RuO2 (b4, d4), hCu0.6Ni0.4O-RuO2 (b5, d5), and commercial RuO2 (b6, d6) supported on carbon (b1, b2, b3, b4, b5, b6) and carbon nanotubes (d1, d2, d3, d4, d5, d6) at different current densities.…”

Section: Resultscontrasting

confidence: 54%

“…Synthesis of the transition metal (Co, Cu, Fe, Ni, CuNi) nanoparticles In a typical synthesis of a monometallic or bimetalic transition metal nanoparticles, 102.8 mg of Ni(acac) 2 , 104.7 mg of Cu(acac) 2 , 102.9 mg of Co(acac) 2 , 141.3 mg of Fe(acac) 3 , or a mixture consisting of 51.4 mg of Ni(acac) 2 and 52.4 mg of Cu(acac) 2 was added to 20 mL of oleylamine in a threenecked flask fitted with a condenser and a stir bar. The solution was heated and kept at target temperature (160°C for Ni, Co and Fe, 190°C for Cu, and 190°C for CuNi) under flowing N 2 for 2 h for the reduction of transition metal ions by oleylamine.…”

Section: General Materialsmentioning

confidence: 99%

“…The chemical reagents, including ruthenium(III) chloride (RuCl 3 , Ru content 45-55%), cupper(II) acetylacetonate (Cu(acac) 2 , 97.5%), nickel(II) acetylacetonate (Ni(acac) 2 , 97.5%), cobalt(II) acetylacetonate (Co(acac) 2 , 97.5%) and iron(III) acetylacetonate (Fe(acac) 3 , 97.5%) and oleylamine (70%, technical grade) from Sigma-Aldrich, potassium hydroxide (KOH, 99%), ethanol (99.5%), methanol (99%), and toluene (99.5%) from Beijing Chemical Works, stainless steel gauze (200 mesh woven from 0.05 mm diameter wire) and commercial ruthenium(IV) oxide hydrate (RuO 2 ·xH 2 O, 54% Ru) with product number of 346088 from J&K Scientific Ltd., Vulcan XC-72 carbon powders with a BET surface area of 250 m 2 g −1 and an average particle size of 40-50 nm (XC-72C) from Cabot Corporation, carbon black with a BET surface area of 62 m 2 g −1 (SUPER C65) from Swiss Timcal Ltd., and polytetrafluoroethylene (PTFE, 60 wt.% aqueous dispersion) and multi-walled carbon nanotubes (CYL2-60) with a diameter of 40-60 nm, a length of 1-2 μm and a specific surface area of 100-150 m 2 g −1 from Shanghai Aladdin Bio-Chem Technology Co., Ltd., were used as received. Deionized water was produced by a Milli-Q Ultrapure-water purification system.…”

Section: General Materialsmentioning

confidence: 99%

“…This is an unavoidable loss of active materials, which reduces the value of maximum specific capacitance with the increase of cycle numbers and affects the cycling stability of the pesudocapacitors. Despite the cyclic-stability issue, pesudocapacitors are still appealing due to their appropriate potential windows [1], higher energy density than that of conventional carbon materials, and better stability than conductive polymers [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors

et al. 2016

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Engineering the internal structure and chemical composition of nanomaterials in a cost-effective way has been challenging, especially for enhancing their performance for a given application. Herein, we report a general strategy to fabricate hollow nanostructures of ruthenium-based binary or ternary oxides via a galvanic replacement process together with a subsequent thermal treatment. In particular, the as-prepared NiO-RuO2 hollow nanostructures loaded on carbon nanotubes (hNiO-RuO2/CNT) with RuO2 mass ratio at 19.6% for a supercapacitor adopting the KOH electrolyte exhibit high specific capacitances of 740 F g −1 at a constant current density of 1 A g −1 with good cycle stability. The specific capacitance for hNiO-RuO2/CNT electrodes maintains 638.4 F g −1 at a current density of 5 A g −1 . This simple approach may shed some light on the way for making a wide range of metal oxides with tunable nanostructures and compositions for a variety of applications.

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Section: Resultscontrasting

confidence: 54%

Section: General Materialsmentioning

confidence: 99%

Section: General Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors

et al. 2016

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“…6,7 Many materials have been used to fabricate supercapacitor electrodes, such as carbon 8 and metal oxides, e.g., RuO 2 and NiO x . 9,10 Also, conducting polymers of polyaniline, polypyrrole, poly (3,4-ethylenedioxythiophene), and polythiophene are widely employed as electrode materials in supercapacitor applications. 11,12 Conducting polymers mainly store energy through a faradaic current resulting from the transfer of charge between electrode and electrolyte (pseudocapacitors).…”

mentioning

confidence: 99%

Mesoporous Polyaniline Films for High Performance Supercapacitors

Khdary

Abdesalam

Enany

2014

J. Electrochem. Soc.

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High surface area mesoporous polyaniline (M-PANI) films can be produced on the surface of glassy carbon electrodes by the electrochemical polymerization from a composite made by mixing a Brij 98 surfactant with a water solution of aniline and sulfuric acid. The surfactant serves as a structure directing agent. When the quantity of Brij 98 in the composite was 45% by weight, it formed a hexagonal phase that comprises a template of cylinders arranged on a hexagonal lattice with a hydrophilic core. The aniline monomer infiltrated the core of the templates. When the potential of the glassy carbon electrode was cycled, the polymerization occurred inside the hollow core and cast it with the PANI film. Subsequently, the Brij 98 template was removed by a thorough washing with water to produce a well-ordered M-PANI film. The structure and the surface morphology of the M-PANI films were fully characterized by a scanning electron microscope and a transmission electron microscope. The electrochemical capacitance properties were investigated using electrochemical techniques, e.g., cyclic voltammetry, galvanostatic cycling and electrochemical impedance. The data showed a significant increase in the specific capacitance (as high as 532 F g −1 ) of the M-PANI films when compared with a non M-PANI electrode, which delivered a specific capacitance of 228 F g Supercapacitors, also known as electrochemical capacitors, have attracted immense attention as one type of efficient energy storage device because of their unique capability to store and release the charge at a very high rate.1,2 Supercapacitors store electrical charges at the interface between high surface area electrodes and liquid electrolytes. The energy stored in supercapacitors comes from the non-faradaic current due to charging of the electrical double layer as well as the pseudocapacitance produced by the faradaic current, which is caused by oxidation-reduction processes that take place at the surface of the electroactive materials.3-5 Therefore, supercapacitors could store capacitances several orders of magnitude higher than conventional capacitors while still maintaining the unique advantage of a high power density and exhibiting excellent reversibility with a long life cycle. 6,7 Many materials have been used to fabricate supercapacitor electrodes, such as carbon 8 and metal oxides, e.g., RuO 2 and NiO x . 9,10Also, conducting polymers of polyaniline, polypyrrole, poly(3,4-ethylenedioxythiophene), and polythiophene are widely employed as electrode materials in supercapacitor applications. 11,12 Conducting polymers mainly store energy through a faradaic current resulting from the transfer of charge between electrode and electrolyte (pseudocapacitors). The charge-transfer process is usually accompanied by electrosorption, oxidation-reduction reactions, and intercalation processes.13 When oxidation occurs, ions are transferred to the polymer backbone and, in case of reduction, the ions are released back into the solution; therefore, the charge-discharge process in con...

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Graphene‐Polypyrrole Nanocomposite: An Ideal Electroactive Material for High Performance Supercapacitors

et al. 2015

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Electrodeposited ruthenium oxide thin films for supercapacitor: Effect of surface treatments

Cited by 166 publications

References 17 publications

Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors

Hollow MO x -RuO2 (M = Co, Cu, Fe, Ni, CuNi) nanostructures as highly efficient electrodes for supercapacitors

Mesoporous Polyaniline Films for High Performance Supercapacitors

Graphene‐Polypyrrole Nanocomposite: An Ideal Electroactive Material for High Performance Supercapacitors

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