Characteristics and electrochemical performances of supercapacitors using double-walled carbon nanotube/δ-MnO2 hybrid material electrodes

Fan, Zhuangjun; Xie, Miaomiao; Xi, Jin; Yan, Jun; Wei, Tong

doi:10.1016/j.jelechem.2011.05.025

Cited by 37 publications

(13 citation statements)

References 35 publications

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“…No matter with or without boron addition, the diffraction peaks appeared obviously are mainly associated with the carbon material except of a broad peak at around 12.5°. Similar phenomena have been reported elsewhere [19,20]. The weak diffraction intensity and the overlapped diffraction peaks may be caused by poor crystallization and/or thinness of MnO 2 film, and the birnessite-type MnO 2 (JCPDS 42-1317) has been demonstrated.…”

Section: Characterizationsupporting

confidence: 85%

Boron-doped MnO2/carbon fiber composite electrode for supercapacitor

Zhong

Zhu

Gao

2015

Journal of Alloys and Compounds

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Section: Characterizationsupporting

confidence: 85%

Boron-doped MnO2/carbon fiber composite electrode for supercapacitor

Zhong

Zhu

Gao

2015

Journal of Alloys and Compounds

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“…• corresponding to (002) and (101) diffractions of graphitic carbon respectively, 38,41,57,59 can be seen for BP. The intensities of the two peaks decreased for the composite material, due to the incorporation of MnO 2 in the MnO 2 @BP composite.…”

Section: Xrd Characterization-mentioning

confidence: 98%

Chemical Mapping and Electrochemical Performance of Manganese Dioxide/Activated Carbon Based Composite Electrode for Asymmetric Electrochemical Capacitor

Gambou-Bosca

Bélanger

2015

J. Electrochem. Soc.

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A MnO 2 @BP nanocomposite was synthesized by simultaneously reduction of KMnO 4 with Mn(CH 3 COO) 2 .4H 2 O and highly porous Black Pearls 2000 at room temperature. The specific surface area, porosity, crystalline form and conductivity of MnO 2 @BP nanocomposite were characterized by nitrogen gas adsorption measurements, scanning electron microscopy, X-ray diffraction and 4-point probe measurements, respectively. The content of MnO 2 and BP in the composite was determined by thermogravimetric analysis. Chemical mapping using Raman spectroscopy was performed to investigate the distribution of MnO 2 and BP in a composite electrode film prepared with polytetrafluoroethylene (PTFE) as binder. This composite electrode exhibits more homogeneously distributed MnO 2 particles when compared to an electrode made by physical mixing of MnO 2 , BP and PTFE (MnO 2 /BP-PTFE). Also, Raman spectroscopy data of both composite electrodes indicates a loss of electrical conductivity of BP in the case of MnO 2 @BP-PTFE. The electrochemical properties were characterized by cyclic voltammetry in aqueous 0.65 M K 2 SO 4 . The specific capacitance of MnO 2 @BP-PTFE composite electrode was 122 ± 5 F/g, which is statistically equivalent to the capacitance of MnO 2 /BP-PTFE composite electrode (129 ± 6 F/g Owing to its large theoretical capacitance, low cost, environmental friendliness and high density, manganese dioxide (MnO 2 ) is an ideal candidate for positive electrode in asymmetric electrochemical capacitor.1-4 However the performance of MnO 2 -based electrodes is limited by the low electrical and ionic conductivities of MnO 2 . Approaches to increase the low specific capacitance of MnO 2 -based electrode include the addition of a conductive additive such as carbons [5][6][7][8][9] or conductive polymers 10-14 to MnO 2 for the fabrication of a composite electrode. On the other hand, the deposition of a thin MnO 2 layer on carbon with various (nano)architectures 7,15-24 yielded high capacitance (∼700 F/g) when only the mass of MnO 2 was taking into account. 1,8,9,16 Such composite electrodes show typical specific capacitance in the range of 150-250 F/g. Thus, the reported specific capacitance per mass of manganese dioxide is more dependent on the quantity of MnO 2 than the nature of the conductive carbon. 5,8,9,16,[21][22][23][25][26][27][28][29][30][31][32][33] Obtaining good electrochemical performance for MnO 2 -based composite electrodes requires that the electrical contact between MnO 2 and the carbon to be as intimate as possible. 21,34 An attractive approach to achieve it, involves the deposition of MnO 2 onto carbon. 15,22,31,[34][35][36][37][38] By this mean, the effective interfacial area between manganese oxide and the solution is greatly increased. Moreover the contact between MnO 2 and carbon will lead to a high electronic conductivity. MnO 2 has been deposited onto a carbon support by various methods such as sol-gel route, thermal decomposition, electrodeposition, sonochemical synthesis, and redox reaction. 18,31,[34][35]...

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“…A test sequence of 11,000 charge-discharge cycles for our graphene/MWNTs nanostructure foam electrode supercapacitor was carried out with a current density of 21.33 mA cm -2 (Figure 3d). After 11,000 cycles, a near 100% capacitance retention was maintained, which demonstrates the excellent electrochemical performance of this type of electrode material for the application of practical energy storage devices [10,11].…”

Section: = × ×mentioning

confidence: 78%

Synthesis of Three Dimensional Carbon Nanostructure Foams for Supercapacitors

et al. 2012

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In this work, we demonstrated the growth of three dimensional graphene/carbon nanotubes hybrid carbon nanostructures on metal foam through a one-step chemical vapor deposition (CVD). The as-grown three dimensional carbon nanostructure foams can be potentially used as the electrodes of energy storage devices such as supercapacitors and batteries. During the CVD process, the carbon nanostructures are grown on highly porous nickel foam to form a high surface area 3-D carbon nanostructure by introducing a mixture precursor gases (H 2 , C 2 H 2 ). The surface morphology was investigated by scanning electron microscopy (SEM) and the results demonstrated relatively homogeneous and densely packed 3-D carbon nanostructure. The quality was characterized by Raman spectroscopy. To further increase the capacitive capability the supercapacitors were fabricated based on the electrodes of carbon nanostructure foam and cyclic voltammetry, charge-discharge, and electrochemical impedance spectroscopy (EIS) were conducted to determine their performance.

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Characteristics and electrochemical performances of supercapacitors using double-walled carbon nanotube/δ-MnO2 hybrid material electrodes

Cited by 37 publications

References 35 publications

Boron-doped MnO2/carbon fiber composite electrode for supercapacitor

Boron-doped MnO2/carbon fiber composite electrode for supercapacitor

Chemical Mapping and Electrochemical Performance of Manganese Dioxide/Activated Carbon Based Composite Electrode for Asymmetric Electrochemical Capacitor

Synthesis of Three Dimensional Carbon Nanostructure Foams for Supercapacitors

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