Nanoscale Microelectrochemical Cells on Carbon Nanotubes

Jin, Xianbo; Zhou, Wuzong; Zhang, Sheng; Chen, George

doi:10.1002/smll.200700139

Cited by 292 publications

(248 citation statements)

References 27 publications

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“…In brief smaller particles dissociates while the bigger ones grow into sheet like particles with a lamellar structure, these sheet-like particles tend to curl and assemble forming the flower-like structure [38]. Under a neutral pH condition, the reaction between carbon (graphene) and KMnO 4 is also governed by the following equation [39]: that our graphene is of good quality and low defect density [40]. The Raman spectrum of NF-G/MnO 2 composite showed an additional sharp peak at 649.9 cm -1 which evidences the deposition of MnO 2 on the graphene foam.…”

Section: Resultsmentioning

confidence: 99%

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Bello

Fashedemi

Fabiane

et al. 2013

Electrochimica Acta

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A green chemistry approach (Hydrothermal Microwave Irradiation) has been used to deposit manganese oxide on nickel foam-graphene. The 3D graphene was synthesized using nickel foam template by chemical vapour deposition (CVD) technique. Raman spectroscopy, X-ray diffraction (XRD), scanning electron and transmission electron microscopies (SEM and TEM); have been used to characterize structure and surface morphology of the composite respectively. The Raman spectroscopy measurements on the samples reveal that 3D graphene consists of mostly few layers with low defect density. The composite was tested in a three electrode configuration for electrochemical capacitor, and exhibited a specific capacitance of 305 F g -1 at a current density of 1 A g -1 and showed excellent cycling stability. The obtained results demonstrate that microwave irradiation technique could be a promising approach to synthesis graphene based functional materials for electrochemical applications.

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Section: Resultsmentioning

confidence: 99%

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Bello

Fashedemi

Fabiane

et al. 2013

Electrochimica Acta

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“…38 In this case, the neutral aqueous electrolytes, such as Li2SO4, Na2SO4, K2SO4, and KCl solutions, are widely used in the MnO2 based supercapacitor and electrode materials studies. [41][42][43][44] It has been found that the supercapacitor using a K2SO4 electrolyte can exhibit a specific energy value of 17.6 Wh kg ─1 at a specific power of 2 kW kg ─1 , which is higher than the similarly designed supercapacitor using a Li2SO4 electrolyte. 43 As to the cycling performance, it was recently reported that an asymmetrical supercapacitor consisting of α-MnO2/CNT as positrode and activated carbon as negatrode with Na2SO4 aqueous electrolyte can retain 77 % of its initial capacity after 20,000 charge-discharge cycles at 50 A g ─1 .…”

Section: Aqueous Supercapacitors and Supercapatteriesmentioning

confidence: 99%

Electrolytes for electrochemical energy storage

Xia

et al. 2017

Mater. Chem. Front.

213

114

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Journal NameThis journal is © The Royal Society of Chemistry 20xxJ. Name., 2013, 00, 1-3 | 1 Electrolyte is a key component of electrochemical energy storage (EES) devices and its properties greatly affect the energy capacity, rate performance, cyclability and safety of all EES devices. This article offers a critical review of recent progresses and challenges in electrolyte research and development particularly for supercapacitors and supercapatteries, recharegable batteries (such as lithium-ion and sodium-ion batteries), and redox flow batteries (including fuel cells in a broad sense). The review will focus on liquid electrolytes, particularly aqueous and organic electrolytes, ionic liquids and molten salts. Influences of electrolyte properties on the performances of different EES devices are discussed in detail.

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“…Several attempts have been introduced in previous research work. One of these is redox deposition of MnO 2 on carbon based materials [11,20,27,28]. Reaction (1) was considered to be responsible for the redox deposition of MnO 2 from KMnO 4 on the surface of carbon based materials.…”

Section: Inorganic Redox Electrode Materials For Supercapatterymentioning

confidence: 99%

Redox electrode materials for supercapatteries

Chen

2016

Journal of Power Sources

193

105

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Redox electrode materials, including transition metal oxides and electronically conducting polymers, are capable of faradaic charge transfer reactions, and play important roles in most electrochemical energy storage devices, such as supercapacitor, battery and supercapattery. Batteries are often based on redox materials with low power capability and safety concerns in some cases. Supercapacitors, particularly those based on redox inactive materials, e.g. activated carbon, can offer high power output, but have relatively low energy capacity. Combining the merits of supercapacitor and battery into a hybrid, the supercapattery can possess energy as much as the battery and output a power almost as high as the supercapacitor. Redox electrode materials are essential in the supercapattery design. However, it is hard to utilise these materials easily because of their intrinsic characteristics, such as the low conductivity of metal oxides and the poor mechanical strength of conducting polymers. This article offers a brief introduction of redox electrode materials, the basics of supercapattery and its relationship with pseudocapacitors, and reviews selectively some recent progresses in the relevant research and development.

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Nanoscale Microelectrochemical Cells on Carbon Nanotubes

Abstract: Nanoscale microelectrochemical cells can form on individual carbon nanotubes in neutral aqueous solutions of KMnO4, leading to corrosion of the nanotubes (see image) and simultaneous deposition of nanocrystalline MnO2 on both external and internal surfaces of the nanotubes.

Cited by 292 publications

References 27 publications

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Electrolytes for electrochemical energy storage

Redox electrode materials for supercapatteries

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