Characterisation of doped polypyrrole/manganese oxide nanocomposite for supercapacitor electrodes

Dong, Zehua; Wei, Yan; Shi, Wei; Zhang, Guo An

doi:10.1016/j.matchemphys.2011.10.016

Cited by 70 publications

(19 citation statements)

References 38 publications

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“…Figure 7a shows cyclic voltammograms (CVs) of MnO 2 /PPy/MnO 2 TNTAs with potential window ranging from −0.3 to 0.3 V vs SCE at different scan rates, and the quasi-rectangular shapes are exhibited in all CV curves, indicating the symmetric current-potential characteristics and well supercapacitive properties. The C sp of MnO 2 /PPy/MnO 2 TNTAs at 5 mV/s is calculated about 379 F/g, which is larger than 277 F/g of MnO 2 NTAs and 250 F/g of PPy NTAs at the same scan rate, and is also larger than some C sp values reported for MnO 2 and PPy samples444546. The enhancement of C sp of MnO 2 /PPy/MnO 2 TNTAs can be attributed to the co-contributions of supercapacitive PPy and MnO 2 , ordered NTAs architecture, high conductivity of PPy layers, and porous double-layered MnO 2 layers.…”

Section: Discussionmentioning

confidence: 55%

Controllable Template-Assisted Electrodeposition of Single- and Multi-Walled Nanotube Arrays for Electrochemical Energy Storage

Wang

Guo

Ding

et al. 2013

Sci Rep

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Here we explored a novel ZnO nanorod array template-assisted electrodeposition route to synthesize large-scale single-walled polypyrrole (PPy) nanotube arrays (NTAs) and multi-walled MnO2/PPy/MnO2 NTAs. The structures of nanotubes, such as external and inner diameters, wall thicknesses, and lengths, can be well controlled by adjusting the diameters and lengths of ZnO nanorods and deposition time. The synthesized hybrid MnO2/PPy/MnO2 triple-walled nanotube arrays (TNTAs) as electrodes showed high supercapacitive perporties, excellent long-term cycling stability, and high energy and power densities. The PPy layers in MnO2/PPy/MnO2 TNTAs provide reliable electrical connections to MnO2 shells and uniquely serve as highly conductive cores to support the redox reactions in the active two-double MnO2 shells with highly electrolytic accessible surface area. The fabricated multi-walled NTAs allow high efficient utilization of electrode materials with facilitated transports of ions and electrons. The outstanding performance makes MnO2/PPy/MnO2 TNTAs promising candidates for supercapacitor electrodes.

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Section: Discussionmentioning

confidence: 55%

Controllable Template-Assisted Electrodeposition of Single- and Multi-Walled Nanotube Arrays for Electrochemical Energy Storage

Wang

Guo

Ding

et al. 2013

Sci Rep

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“…As the scan rate is decreased, the CV diagram refl ects larger capacitive behaviour where full charging/discharging of the material can occur, leading to good electrochemical reversibility and an increase in the utilisation of the electroactive surface area. [ 15 ] The specifi c capacitance per electrode at 2 mV/s and 2000 mV/s was calculated using the following equation [ 16 ] 2…”

Section: Electrochemical Properties Of Cnt/graphene Yarnmentioning

confidence: 99%

Highly Conductive Carbon Nanotube‐Graphene Hybrid Yarn

Foroughi

Spinks

Antiohos

et al. 2014

Adv Funct Materials

116

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An effi cient procedure for the fabrication of highly conductive carbon nanotube/ graphene hybrid yarns has been developed. To start, arrays of vertically aligned multi-walled carbon nanotubes (MWNT) are converted into indefi nitely long MWNT sheets by drawing. Graphene fl akes are then deposited onto the MWNT sheets by electrospinning to form a composite structure that is transformed into yarn fi laments by twisting. The process is scalable for yarn fabrication on an industrial scale. Prepared materials are characterized by electron microscopy, electrical, mechanical, and electrochemical measurements. It is found that the electrical conductivity of the composite MWNT-graphene yarns is over 900 S/cm. This value is 400% and 1250% higher than electrical conductivity of pristine MWNT yarns or graphene paper, respectively. The increase in conductivity is asssociated with the increase of the density of states near the Fermi level by a factor of 100 and a decrease in the hopping distance by an order of magnitude induced by grapene fl akes. It is found also that the MWNT-graphene yarn has a strong electrochemical response with specifi c capacitance in excess of 111 Fg −1 . This value is 425% higher than the capacitance of pristine MWNT yarn. Such substantial improvements of key properties of the hybrid material can be associated with the synergy of MWNT and graphene layers in the yarn structure. Prepared hybrid yarns can benefi t such applications as high-performance supercapacitors, batteries, high current capable cables, and artifi cial muscles.

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“…Although the electrical conductivity of intrinsic PPY is low, doping of surfactants can enhance effectively the electrical conductivity of PPY. p-Toluenesulfonic acid (p-TSA) was used as a dopant by Dong et al [34] to prepare MnO 2 -PPY/TSA nanocomposite for supercapacitor applications. TSA and pyrrole were dispersed ultrasonically in deionised water to form a homogeneous solution.…”

Section: Other Polymer and Metal Oxide Nanocompositesmentioning

confidence: 99%

Application of Nanocomposites for Supercapacitors: Characteristics and Properties

Yang¹

2012

Nanocomposites - New Trends and Developments

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Characterisation of doped polypyrrole/manganese oxide nanocomposite for supercapacitor electrodes

Cited by 70 publications

References 38 publications

Controllable Template-Assisted Electrodeposition of Single- and Multi-Walled Nanotube Arrays for Electrochemical Energy Storage

Controllable Template-Assisted Electrodeposition of Single- and Multi-Walled Nanotube Arrays for Electrochemical Energy Storage

Highly Conductive Carbon Nanotube‐Graphene Hybrid Yarn

Application of Nanocomposites for Supercapacitors: Characteristics and Properties

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