2014
DOI: 10.1021/jp505744p
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Facile Synthesis of MnO2/CNTs Composite for Supercapacitor Electrodes with Long Cycle Stability

Abstract: The MnO 2 /carbon nanotubes (CNTs) composites were prepared through a modified one-pot reaction process, in which CNTs were coated by cross-linked MnO 2 flakes uniformly. The composition, morphology, and microstructure of the products were characterized using TG, XRD, XPS, Raman, FESEM, TEM, and STEM. It reveals that the MnO 2 layer stands on the sidewalls of the inner nanotubes uniformly about 50 nm thick, and the loading of MnO 2 on the CNTs reaches 84%. Furthermore, the supercapacitive performances were inv… Show more

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Cited by 386 publications
(197 citation statements)
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“…It is worth noting that the maximum energy density for the asymmetric supercapacitor is 23.6 Wh kg À1 at a power density of 188.8 W kg À1 , which is comparable or higher than those of other MnO 2 -based asymmetric cells in aqueous electrolyte solutions (Fig. 6I) [9,28,29,40,42]. Furthermore, this assembled asymmetric cell displays a good power characteristic, and it keeps an acceptable energy density of 12.1 Wh kg À1 when the power density reaches up to 3570.5 W kg À1 .…”
Section: Electrochemical Measurementsmentioning
confidence: 74%
“…It is worth noting that the maximum energy density for the asymmetric supercapacitor is 23.6 Wh kg À1 at a power density of 188.8 W kg À1 , which is comparable or higher than those of other MnO 2 -based asymmetric cells in aqueous electrolyte solutions (Fig. 6I) [9,28,29,40,42]. Furthermore, this assembled asymmetric cell displays a good power characteristic, and it keeps an acceptable energy density of 12.1 Wh kg À1 when the power density reaches up to 3570.5 W kg À1 .…”
Section: Electrochemical Measurementsmentioning
confidence: 74%
“…To address the above issues, a general strategy is to combine MnO 2 with conductive components [26][27][28] such as carbon nanotubes (CNTs) [29][30][31], graphene [32,33], and conductive polymers [34,35]. For example, the conductive polymer wrapped graphene/MnO 2 composite exhibits a high specific capacitance of $380 F g À1 at a current density of 0.1 mA cm À2 and $175 F g À1 at 5 mA cm À2 [36], while MnO 2 /CNT composite material delivers a capacitance of 201 F g À1 at a current density of 1.0 A g À1 and 140 F g À1 at 20 A g À1 [37]. Beyond this, it is also important to design and build novel architectures with efficient ion-and electron-transport pathways as well as robustness to further improve the electrode kinetics and integrity, which is highly demanded by highperformance supercapacitors [38,39].…”
Section: Introductionmentioning
confidence: 99%
“…Moreover, many research groups have prepared carbon based metal oxide composites to enhance the poor electrical conductivity of metal oxides. For example, MnO 2 /CNT composite prepared by Li et al [8] exhibited a specific capacitance of 201 F g −1 .…”
Section: Introductionmentioning
confidence: 99%