Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors

Wei, Weifeng; Cui, Xinwei; Chen, Weixing; Ivey, Douglas G.

doi:10.1016/j.jpowsour.2008.10.058

Cited by 140 publications

(91 citation statements)

References 33 publications

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“…performance is degraded [18,[30][31][32]. However, the present study proves that the use of an inorganic solid electrolyte is effective to suppress the dissolution of manganese oxides, especially in high temperature ranges.…”

Section: Fabrication and Characterization Of All-solid-state Ecsmentioning

confidence: 55%

All-solid-state electrochemical capacitors using MnO2/carbon nanotube composite electrode

Shimamoto

Tadanaga

Tatsumisago

2013

Electrochimica Acta

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MnO 2 /carbon nanotube (CNT) composite was prepared by a solution process. In the obtained MnO 2 -CNT composite, MnO 2 particles were well-dispersed on CNTs. The specific capacitance of the MnO 2 -CNT composite in an aqueous electrolyte was higher than that of MnO 2 and CNT. All-solid-state electrochemical capacitors (ECs) were fabricated using the MnO 2 -CNT composite as a positive electrode, activated carbon powder as a negative electrode, and phosphosilicate gel as an electrolyte. The obtained all-solid-state ECs operated at the temperature range between -30⁰C and 100⁰C. The specific discharge capacitance and the rate ability of the capacitors were improved by elevating temperature. In addition, the fabricated all-solid-state ECs exhibited excellent cycle performance at the temperature range between -30⁰C and 100⁰C for 20,000 cycles.These results indicate that all-solid-state ECs using MnO 2 are promising energy storage devices with excellent stability and high reliability at the wide range of temperatures.

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Section: Fabrication and Characterization Of All-solid-state Ecsmentioning

confidence: 55%

All-solid-state electrochemical capacitors using MnO2/carbon nanotube composite electrode

Shimamoto

Tadanaga

Tatsumisago

2013

Electrochimica Acta

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“…The most promising among them is manganese dioxide MnO 2 because of its low cost, environmental compatibility, natural abundance, high energy density, and excellent capacitive performance in aqueous electrolytes [32,[135][136][137][138][139][140][141][142][143]. In aqueous electrolytes, the charging mechanism of MnO 2 may be described by the following reaction: .…”

Section: Composites Containing Carbon Nanotubes and Metal Oxidesmentioning

confidence: 99%

Recent Progress on Electrochemical Capacitors Based on Carbon Nanotubes

Grądzka¹,

Winkler²

2018

Carbon Nanotubes - Recent Progress

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This review is focused on the theoretical and practical aspects of electrochemical c a p a c i t o r sb a s e do nc a r b o nn a n o t u b e s .I np articular, recent improvements in the capacitance properties of the systems are discussed. In the first part, the charge storage mechanisms of the electrochemical capacitors are briefly described. The next part of the review is devoted to the capacitance properties of pristine single-and multi-walled carbon nanotubes. The major portion of the review is focused on the capacitance properties of modified carbon nanotubes. The electrochemical properties of nanotubes with boron, nitrogen, and other atoms incorporated into the carbon network structure as well as nanotubes modified with different functional groups are discussed. Special attention is paid to the composites of carbon nanotubes and conducting polymers, transition metal oxides, carbon nanostructures, and carbon gels. In all cases, the influences of different parameters such as porosity, structure of the electroactive layer, conductivity of the layer, nature of the heteroatoms, solvent and supporting electrolyte on the capacitance performance of hybrid materials are discussed. Finally, the capacitance properties of different systems containing carbon nanotubes are compared and summarized.

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“…29 A closer investigation of the electrode after cycling also found that a few flake-shaped nanosheets emerge after cycling (see Supplementary Figure S16), indicating that the structure may be affected by the 'dissolution-redeposition' process. 31 The mechanism of this process assumes that Mn atoms at the surface are first dissolved in the electrolyte during reduction at low potentials; the dissolved Mn are then re-oxidized into insoluble MnO 2 and deposit on the surface. The shape of the re-deposited MnO 2 can be very different from that of the original as-prepared MnO x .…”

Section: Improved Cyclic Stability Through Plasma Treatmentmentioning

confidence: 99%

“…36,37 This improved stability can be explained by noting the two main mechanisms for the capacitance degradation of MnO x -based electrodes, namely, Mn dissolution and mechanical failure. 31 The former is associated with the partial dissolution of MnO x into the electrolyte, whereas the latter is caused by mechanical failure upon cycling. With plasma treatment, the better wettability of the CNT/RGO layer could lead to better accessibility of Mn ions in the electrodeposition of MnO x .…”

Section: Improved Cyclic Stability Through Plasma Treatmentmentioning

confidence: 99%

MnOx/carbon nanotube/reduced graphene oxide nanohybrids as high-performance supercapacitor electrodes

et al. 2014

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Nanohybrids consisting of both carbon and pseudocapacitive metal oxides are promising as high-performance electrodes to meet the key energy and power requirements of supercapacitors. However, the development of high-performance nanohybrids with controllable size, density, composition and morphology remains a formidable challenge. Here, we present a simple and robust approach to integrating manganese oxide (MnO x ) nanoparticles onto flexible graphite paper using an ultrathin carbon nanotube/ reduced graphene oxide (CNT/RGO) supporting layer. Supercapacitor electrodes employing the MnO x /CNT/RGO nanohybrids without any conductive additives or binders yield a specific capacitance of 1070 F g − 1 at 10 mV s − 1 , which is among the highest values reported for a range of hybrid structures and is close to the theoretical capacity of MnO x . Moreover, atmosphericpressure plasmas are used to functionalize the CNT/RGO supporting layer to improve the adhesion of MnO x nanoparticles, which results in theimproved cycling stability of the nanohybrid electrodes. These results provide information for the utilization of nanohybrids and plasma-related effects to synergistically enhance the performance of supercapacitors and may create new opportunities in areas such as catalysts, photosynthesis and electrochemical sensors. NPG Asia Materials (2014) 6, e140; doi:10.1038/am.2014.100; published online 31 October 2014 INTRODUCTIONSupercapacitors are promising energy storage systems for diverse applications such as portable electronics, roll-up displays, hybrid electric vehicles, self-powered sensors, artificial muscles and biomedical implants. 1,2 The performance of supercapacitors fills the gap between batteries and conventional electrolytic capacitors, with such advantages as fast dynamic response, high power density, high rate capability, safe operation and long lifespan. The most common materials for current supercapacitor electrodes are high-surface-area carbon-based nanostructures, including activated carbons, porous/ templated graphite, carbon nanotubes (CNTs) and graphene. [3][4][5][6] However, the relatively low specific capacitance and energy density of these carbon-based electrodes have so far hampered their widespread applications in real devices.To address this challenge, hybrid materials that can synergistically combine the attributes of both carbon and pseudocapacitive materials such as metal oxides and conductive polymers have been actively pursued. [7][8][9] Pseudocapacitive materials store electrochemical energy in a similar manner as carbon-based materials but have a specific capacitance that is usually one order of magnitude larger. Among various pseudocapacitive materials, manganese oxides (MnO x ) have attracted the strongest interest because of their natural abundance, low cost and environmental friendliness. 10 Numerous studies have

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Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors

Cited by 140 publications

References 33 publications

All-solid-state electrochemical capacitors using MnO2/carbon nanotube composite electrode

All-solid-state electrochemical capacitors using MnO2/carbon nanotube composite electrode

Recent Progress on Electrochemical Capacitors Based on Carbon Nanotubes

MnOx/carbon nanotube/reduced graphene oxide nanohybrids as high-performance supercapacitor electrodes

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