Effect of hydrothermal treatment on the performance of RuO2–Ta2O5/Ti electrodes for use in supercapacitors

Jow, Jiin-Jiang; Lai, Huen-Hua; Chen, Ho-Rei; Wang, Cheng-Chin; Wu, Mao‐Sung; Ling, Tzong-Rong

doi:10.1016/j.electacta.2009.12.062

Cited by 16 publications

(4 citation statements)

References 34 publications

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“…As shown in Figure f, the capacitance of the RuO 2 -film-based electrode (pink squares) decreased rapidly at the early stage of the repeating potential sweep, which is attributed to the easy detachment of the RuO 2 film from the current collector. Although polymeric binders such as polytetrafluoroethylene (PTFE), , polyvinylidene fluoride (PVDF), ,, and Nafion , were often used to tightly bind RuO 2 electrodes on the current collectors, the addition of the binders resulted in the inevitable deterioration of device properties such as specific capacitance and electrical conductivity. In contrast, the capacitance retention of the 1.0 wt %-RuO 2 /H-PANi electrode (blue circles) was 90.8% of the initial value even after 5000 cycles, indicating that the RuO 2 nanoparticles were well preserved in the PANi hollows.…”

Section: Resultsmentioning

confidence: 99%

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

Kwon

Hong

Ryu

et al. 2017

ACS Appl. Mater. Interfaces

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A major limitation of polyaniline (PANi) electrodes for supercapacitors is the slow rate of ion transport during redox reactions and the resultant easy saturation of areal capacitance with film thickness. In this study, three-dimensionally (3D)-arrayed PANi nanospheres with highly roughened surface nanomorphology were fabricated to overcome this limitation. A hierarchical nanostructure was obtained by polymerizing aniline monomers on a template of 3D-arrayed polystyrene (PS) nanospheres and appropriate oxidative acid doping. The structure provided dramatically increased surface area and porosity that led to the efficient diffusion of ions. Thus, the specific capacitance (C) reached 1570 F g, thereby approaching a theoretical capacitance of PANi. In addition, the retention at a high scan rate of 100 mV s was 77.6% of the C at a scan rate of 10 mV s. Furthermore, 3D-arrayed hollow PANi (H-PANi) nanospheres could be obtained by dissolving the inner PS part of the PS/PANi core/shell nanospheres with tetrahydrofuran. The ruthenium oxide (RuO) nanoparticles (NPs) were also encaged in the H-PANi nanospheres by embedding RuO NPs on the PS nanospheres prior to polymerization of PANi. The combination of the two active electrode materials indicated synergetic effects. The areal capacitance of the RuO-encaged PANi electrode was significantly larger than that of the RuO-free PANi electrode and could be controlled by varying the amount of encaged RuO nanoparticles. The encagement could also solve the problem of detachment of RuO electrodes from the current collector. The effects of the nanostructuring and RuO encagement were also quantitatively analyzed by deconvoluting the total capacitance into the surface capacitive and insertion elements.

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Section: Resultsmentioning

confidence: 99%

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

Kwon

Hong

Ryu

et al. 2017

ACS Appl. Mater. Interfaces

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“…However, when fabricated in this way, only a very thin surface layer of the film can participate in the charge storage process because of its dense morphology. In addition, the films are easily detached from the current collector substrates. , This detachment problem can partly be solved by using polymeric binders, but the addition of these binders leads to an inevitable deterioration in device properties. ,− In order to overcome the limitations of film-type electrodes, nanostructured RuO 2 electrodes based on nanosheets, nanotubes, nanorods, , nanopillars and nanofibers have been proposed. Although the introduction of these nanostructures has been reported to improve the electrode’s capacitive properties to some extent, the techniques are currently unsuitable for practical use because of their complicated and expensive nanoprocesses.…”

Section: Introductionmentioning

confidence: 99%

RuO₂ Thin Films Electrodeposited on Polystyrene Nanosphere Arrays: Growth Mechanism and Application to Supercapacitor Electrodes

Hong

Yim

2018

Langmuir

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Two-dimensionally (2D) arrayed polystyrene (PS)/ruthenium oxide (RuO) core/shell nanospheres are successfully prepared by the electrodeposition of RuO nanoparticles on a hexagonal close-packed PS monolayer. This nanosphere structure is entirely different from the structure previously reported for other transition metal oxides electrodeposited on the PS nanosphere arrays. The different growth behavior is analyzed, and a possible deposition mechanism is proposed based on the morphological evolution and photoelectron spectroscopy measurements. As an electrode for supercapacitors, this 2D arrayed nanosphere structure exhibits superior capacitive properties such as significantly large areal capacitance, tight binding with current collectors, and retarded saturation of the capacitance, compared to a planar RuO film electrode.

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“…Faraday pseudocapacitors have higher theoretical capacitance than double-layer capacitors [ 1 ]. Many electrode materials are utilized in supercapacitors, such as carbon [ 2 , 3 , 4 ], conducting polymers [ 5 , 6 , 7 ], and metal oxides [ 8 , 9 , 10 , 11 ]. MnO 2 is one of the most attractive metal oxide electrode materials because of its abundance, low cost, environmental friendliness, and high theoretical capacitance of approximately 1380 F/g [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Nucleation/Growth Mechanisms and Morphological Evolution of Porous MnO2 Coating Deposited on Graphite for Supercapacitor

Huang

2017

Materials

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The nucleation and growth mechanisms of porous MnO2 coating deposited on graphite in MnSO4 solution were investigated in detail by cyclic voltammetry, chronoamperometry and scanning electron microscopy. The electrochemical properties of honeycomb-like MnO2 were evaluated by cycle voltammetry and galvanostatic charge-discharge. Results indicated that MnO2 was synthesized by the following steps: Mn2+→Mn3++e−, Mn3++2H2O→MnOOH+3H+, and MnOOH→MnO2+H++e−. The deposition of MnO2 was divided into four stages. A short incubation period (approximately 1.5 s) was observed, prior to nucleation. The decreasing trend of the current slowed as time increased due to nucleation and MnO2 growth in the second stage. A huge number of nuclei were formed by instantaneous nucleation, and these nuclei grew and connected with one another at an exceedingly short time (0.5 s). In the third stage, the gaps in-between initial graphite flakes were filled with MnO2 until the morphology of the flakes gradually became similar to that of the MnO2-deposited layer. In the fourth stage, the graphite electrode was covered completely with a thick and dense layer of MnO2 deposits. All MnO2 electrodes at different deposition times obtained nearly the same specific capacitance of approximately 186 F/g, thus indicating that the specific capacitance of the electrodes is not related with deposition time.

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Effect of hydrothermal treatment on the performance of RuO2–Ta2O5/Ti electrodes for use in supercapacitors

Cited by 16 publications

References 34 publications

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

RuO₂ Thin Films Electrodeposited on Polystyrene Nanosphere Arrays: Growth Mechanism and Application to Supercapacitor Electrodes

Nucleation/Growth Mechanisms and Morphological Evolution of Porous MnO2 Coating Deposited on Graphite for Supercapacitor

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Effect of hydrothermal treatment on the performance of RuO2–Ta2O5/Ti electrodes for use in supercapacitors

Cited by 16 publications

References 34 publications

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO2 Nanoparticles

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO2 Nanoparticles

RuO2 Thin Films Electrodeposited on Polystyrene Nanosphere Arrays: Growth Mechanism and Application to Supercapacitor Electrodes

Nucleation/Growth Mechanisms and Morphological Evolution of Porous MnO2 Coating Deposited on Graphite for Supercapacitor

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Product

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Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

Supercapacitive Properties of 3D-Arrayed Polyaniline Hollow Nanospheres Encaging RuO₂ Nanoparticles

RuO₂ Thin Films Electrodeposited on Polystyrene Nanosphere Arrays: Growth Mechanism and Application to Supercapacitor Electrodes