Achieving high specific charge capacitances in Fe3O4/reduced graphene oxide nanocomposites

Shi, Wenhui; Zhu, Jixin; Sim, Daohao; Tay, Yee Yan; Lu, Ziyang; Zhang, Xiaojun; Sharma, Yogesh; Srinivasan, Madhavi; Zhang, Hua; Hng, Huey Hoon; Yan, Qingyu

doi:10.1039/c0jm03175e

Cited by 438 publications

(215 citation statements)

References 52 publications

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“…This facilitates fast electron transport between the active materials and current collectors in supercapacitors [15,17]. Furthermore, CVD-grown 3D graphene networks have high conductivity due to the high intrinsic conductivity of defect-free graphene and the absence of inter-sheet junction resistance in this seamlessly continuous network [21].…”

Section: Introductionmentioning

confidence: 99%

“…Graphene electrode alone have been found to have specific capacitance of up to 135 F/g [13,14]. On the other hand, nanocomposites consisting of graphene and transition metal oxides have attracted wide attention in the field of supercapacitors due to the synergistic effect arising from the combination of the redox reaction of the metal oxides with the high surface area/conductivity of graphene, which improves the electrochemical performance [15,16]. This has been reported to be highly dependent on the quality and conductivity of the graphene [17].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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Nickel foam-graphene (NF-G) was synthesised by chemical vapour deposition (CVD) followed by facial in situ aqueous chemical growth of simonkolleite (Zn 5 (OH) 8 Cl 2 ·H 2 O) under hydrothermal conditions to form NF-G/simonkolleite composite. X-ray diffraction and Raman spectroscopy show the presence of simonkolleite on the NF-G, while scanning electron and transmission electron microscopies show simonkolleite micro-plates like structure evenly distributed on the NF-G. Electrochemical measurements of the composite electrode give a specific capacitance of 350 Fg -1 at current density of 0.7 Ag -1 for our device measured in three-electrode configuration. The composite also shows a rate capability of 87% capacitance retention at a high current density of 5 Ag -1 , which makes it a promising candidate as an electrode material for supercapacitor applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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“…The performance of a flexible supercapacitor mainly depends on the properties of electrode materials and the device configuration [6]. The electrode materials of supercapacitor include various nanocarbons, conducting polymers and transition metal oxides [7][8][9][10][11][12]. Conducting polymer electrodes possess several merits, such as high electric conductivity, large capacitance, inherent flexibility and easy to processing [13][14][15][16][17][18].…”

mentioning

confidence: 99%

Conducting polymer hydrogel materials for high-performance flexible solid-state supercapacitors

et al. 2016

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Different from solid electrodes, conducting polymer hydrogel electrodes swollen with water and ions, can reach contact with the electrolyte solution at the molecular level, which will result in more efficient electrochemical process of supercapacitors. Besides, the inherent soft nature of hydrogel material offers the electrode superior flexibility, which benefits to gain high flexibility for devices. Here, this perspective briefly introduces the current research progress in the field of conducting polymer hydrogel electrodes-based flexible solid-state supercapacitor and gives an outlook on the future trend of research.Keywords: Conducting polymer hydrogels, flexible supercapacitor, soft electrode, polyaniline, integrated device Nowadays, flexible energy storage devices (batteries and supercapacitors) have received widely attentions as the rapid progress of flexible and wearable electronics [1,2]. Flexible solid-state supercapacitors represent a new type of supercapacitor that can work under consecutive bending, stretching and even twisting states [3][4][5]. However, it remains a large challenge to obtain a flexible solid-state supercapacitor with high electrochemical performance and superior flexibility. The performance of a flexible supercapacitor mainly depends on the properties of electrode materials and the device configuration [6]. The electrode materials of supercapacitor include various nanocarbons, conducting polymers and transition metal oxides [7][8][9][10][11][12]. Conducting polymer electrodes possess several merits, such as high electric conductivity, large capacitance, inherent flexibility and easy to processing [13][14][15][16][17][18]. However, the separations of the molecular chains in conducting polymers are generally small relative to the double layer thickness, which results in low capacitance [19]. Besides, the low ionic mobility in the polymer matrix reduces the maximum power density of such electrodes [20].On the other hand, the current device configuration of the flexible solid-state supercapacitor somewhat hinders the device to gain better performance. Generally, a flexible solid-state supercapacitor consists of a "sandwich" laminated structure, including two flexible solid electrodes and the middle gel polymer electrolyte layer [21]. In terms of this structure, the solid electrode materials hardly make a sufficient contact with the gel polymer electrolyte that possesses large viscosity and poor diffusion, which results in low capacitance and sluggish the electrochemical response.Hydrogel is made up of solid three-dimensional polymeric networks and large amounts of water medium [22]. Generally, the hydrogels are employed as solid-state electrolyte of supercapacitors, such as polyvinyl alcohol (PVA) gel polymer electrolyte. Recently, conducting polymer hydrogels were used as electrode materials for supercapacitors instead of traditional solid electrodes [19,[23][24][25]. This "aqua material electrode" is conducting polymer matrix swollen with water and ions, which hence produce a...

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“…Graphene-based nanocomposites are widely investigated in applications such as biomedicine 17 , photocatalysis 18 , biosensors 13 , batteries 19 , supercapacitors 20 , fuel cells 21 , Raman enhancement 22 . In the last years, a lot of attention has been paid to elaborate the methodology of obtaining graphene and graphene derivatives composites with inorganic nanostructures with controlled shape, size, crystallinity and functionality.…”

Section: 16mentioning

confidence: 99%

Reduced graphene oxide and inorganic nanoparticles composites – synthesis and characterization

Onyszko

Urbas

Aleksandrzak

et al. 2015

Polish Journal of Chemical Technology

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Graphene -novel 2D material, which possesses variety of fascinating properties, can be considered as a convenient support material for the nanoparticles. In this work various methods of synthesis of reduced graphene oxide with metal or metal oxide nanoparticles will be presented. The hydrothermal approach for deposition of platinum, palladium and zirconium dioxide nanoparticles in ethylene glycol/water solution was applied. Here, platinum/ reduced graphene oxide (Pt/RGO), palladium/reduced graphene oxide (Pd/RGO) and zirconium dioxide/reduced graphene oxide (ZrO 2 /RGO) nanocomposites were prepared. Additionally, manganese dioxide/reduced graphene oxide nanocomposite (MnO 2 /RGO) was synthesized in an oleic-water interface. The obtained nanocomposites were investigated by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Raman spectroscopy and thermogravimetric analysis (TGA). The results shows that GO can be successfully used as a template for direct synthesis of metal or metal oxide nanoparticles on its surface with a homogenous distribution.

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Achieving high specific charge capacitances in Fe3O4/reduced graphene oxide nanocomposites

Cited by 438 publications

References 52 publications

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Conducting polymer hydrogel materials for high-performance flexible solid-state supercapacitors

Reduced graphene oxide and inorganic nanoparticles composites – synthesis and characterization

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