Nanocomposites of manganese oxides and carbon nanotubes for aqueous supercapacitor stacks

Zhang, Sheng; Peng, Chuang; Ng, Kok Chiang; Chen, George

doi:10.1016/j.electacta.2010.01.078

Cited by 69 publications

(62 citation statements)

References 38 publications

(60 reference statements)

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“…A very basic work on the nanoscale micro-electrochemical cells on CNTs [28] has been done to investigate the redox deposition of MnO 2 and to confirm the correctness of reaction (1) CVs of the CNT-65 w% MnO 2 sample under different conditions are shown inn Fig. 2e and 2f [20]. The specific capacitance was found to be 144 F g -1 on average [28].…”

Section: Inorganic Redox Electrode Materials For Supercapatterymentioning

confidence: 99%

“…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%

“…In aqueous electrolytes, supercapatteries show smaller specific energy because of the smaller operational cell voltage, but they are advantageous in terms of specific power. Table 1 summarises various combinations of capacitive and faradaic electrode materials, and lists the reported performance of the electrochemical energy storage devices, including the supercapacitors [15][16][17][18][19][20], supercapatteries [5,8,[17][18][19][20][21][22] and batteries [23]. Recent progress on the high energy capacity electrode materials is also discussed.…”

Section: Figmentioning

confidence: 99%

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Redox electrode materials for supercapatteries

Chen

2016

Journal of Power Sources

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207

111

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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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Section: Inorganic Redox Electrode Materials For Supercapatterymentioning

confidence: 99%

Section: Inorganic Redox Electrode Materials For Supercapatterymentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

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Redox electrode materials for supercapatteries

Chen

2016

Journal of Power Sources

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207

111

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“…Also, for the MnO 2 electrode, provided the negative potential end is positively shifted to avoid reduction to the soluble Mn II state, a capacitive feature can be obtained for this electrode. 3,47 Generally, it is important to note that pseudocapacitive electrode materials are usually of low conductivity and hence composited with carbonaceous materials for example carbon nanotubes (CNTs). The resulting composite electrodes display improved capacitive properties.…”

Section: Charge Storage Mechanismsmentioning

confidence: 99%

Fundamental Consideration for Electrochemical Engineering of Supercapattery

Akinwolemiwa¹

2018

J. Braz. Chem. Soc.

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Supercapattery is the generic name for various electrochemical energy storage (EES) devices combining the merits of battery (high energy density) and supercapacitor (high power density and long cycling life). In this article, the principle and applications of EES devices are selectively reviewed as the background for supercapattery development. The focus is on the engineering aspects for fabrication of two types of supercapattery: (i) by coupling a battery electrode with a supercapacitor electrode, or (ii) from materials that possess both the Nernstian and capacitive charge storage capacities. Fundamental rationales are discussed in relation with the designs, such as why the device is always asymmetrical, and what materials are suitable for making supercapattery. Whilst the key is how to optimize device performance in terms of energy capacity, power capability and cycle life, cost is also discussed on resource rich materials such as nanostructured composites and redox electrolytes.

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“…For example, carbon black has been used just in a simple mixture with manganese oxide. 8,9 Other strategies consist in decorating different kinds of carbon particles with thin layers of MnO 2 28 From all these studies it is clear that an intimate mixture of the carbon additive and manganese dioxide leads to improved power capability, but there is no clear trend to tell which carbon additive leads to the best electrode. However, carbon black is already widely used in ECs technology and thus it should be desirable to focus on this type of carbon when designing MnO 2 based electrode.…”

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confidence: 99%

Electrochemical Performance of Carbon/MnO₂Nanocomposites Prepared via Molecular Bridging as Supercapacitor Electrode Materials

Ramirez-Castro

Crosnier

Athouël

et al. 2015

J. Electrochem. Soc.

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The chemical binding of amorphous manganese oxide and carbon particles was achieved with the diazonium chemistry. The synthesis was performed in two steps, with a first step consisting in the surface functionnalization of carbon particles with aminophenyl groups and the subsequent attachment of amorphous manganese oxide particles through generated phenyl groups. The bond between carbon and MnO 2 particles is believed to occur between the carbon from the phenyl groups attached to carbon particles, and the oxygen atoms from the manganese oxide lattice. The capacitance of the carbon/MnO 2 grafted nanocomposite electrode is doubled compared to a simple mixture of its two components. The constant increment in the study and development of energy storage devices such as electrochemical capacitors (ECs) is related to an ever-growing demand of energy of the society. Electrochemical capacitors can be classified by their energy storage mechanisms in two main systems: 1) electrical double layer capacitance which arises from the charge separation at the electrode/electrolyte interface 1 and 2) pseudocapacitive charge storage phenomena where fast and reversible reactions take place.2 At this time, carbon is the commonly used electrode material for electrical double layer capacitor (EDLC) 3 while transition metal oxides and some conductive metal nitrides have demonstrated good performance as pseudocapacitive electrodes. 4 In terms of pseudocapacitive materials, manganese oxide (MnO 2 ) has proved to be one of the most promising materials due to its high energy density, low cost, environmental friendliness and natural abundance. 5 The initial studies describing the use of MnO 2 as an electrode material for ECs were performed by Lee and Goodenough. 6 They reported that amorphous or poorly crystallized MnO 2 powders incorporated into composite electrodes exhibited a capacitor-like electrochemical response in neutral KCl electrolyte, and delivered a specific capacitance of 200 F/g for "bulk" electrodes. Since this initial report, the interest in MnO 2 for ECs applications has grown steadily.Despite its electrochemical performance, the use of MnO 2 is still limited to moderate power applications due to its poor intrinsic electrical conductivity (10 −5 to 10 −6 S.cm −1 ). 7 Up to now, one of the most viable approaches to circumvent this major drawback is the use of a conductive additive such as carbon for improving the percolation through the electrode. For example, carbon black has been used just in a simple mixture with manganese oxide. 28 From all these studies it is clear that an intimate mixture of the carbon additive and manganese dioxide leads to improved power capability, but there is no clear trend to tell which carbon additive leads to the best electrode. However, carbon black is already widely used in ECs technology and thus it should be desirable to focus on this type of carbon when designing MnO 2 based electrode.In this study, we designed a new approach for the preparation of carbon/metal oxide composite electrod...

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Nanocomposites of manganese oxides and carbon nanotubes for aqueous supercapacitor stacks

Cited by 69 publications

References 38 publications

Redox electrode materials for supercapatteries

Redox electrode materials for supercapatteries

Fundamental Consideration for Electrochemical Engineering of Supercapattery

Electrochemical Performance of Carbon/MnO₂Nanocomposites Prepared via Molecular Bridging as Supercapacitor Electrode Materials

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Nanocomposites of manganese oxides and carbon nanotubes for aqueous supercapacitor stacks

Cited by 69 publications

References 38 publications

Redox electrode materials for supercapatteries

Redox electrode materials for supercapatteries

Fundamental Consideration for Electrochemical Engineering of Supercapattery

Electrochemical Performance of Carbon/MnO2Nanocomposites Prepared via Molecular Bridging as Supercapacitor Electrode Materials

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Product

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Electrochemical Performance of Carbon/MnO₂Nanocomposites Prepared via Molecular Bridging as Supercapacitor Electrode Materials