Synthesis of mesoporous polythiophene/MnO2 nanocomposite and its enhanced pseudocapacitive properties

Lü, Qing; Zhou, Yikai

doi:10.1016/j.jpowsour.2010.12.059

Cited by 162 publications

(56 citation statements)

References 50 publications

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“…Based on this structure, many binary composites, such as MnO 2 /CNT [19e23] and MnO 2 / conducting polymers [24,25], have been studied for high electrochemical performances. However, MnO 2 /conducting polymer composites suffer from the mechanical instability and poor cycleability [26,27]. In contrast, binary composites of MnO 2 /CNT exhibit advanced electrochemical performances, such as high specific capacitance, enhanced electrical conductivity and good cycling stability, which are attributed to the improved conductivity and mechanical property by CNTs [28e30].…”

Section: Introductionmentioning

confidence: 99%

Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

Feng

et al. 2012

Journal of Power Sources

144

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Section: Introductionmentioning

confidence: 99%

Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

Feng

et al. 2012

Journal of Power Sources

144

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“…4, the initial weight loss corresponding to a broad endothermic peak is observed around 50-300°C for PM4. It can be attributed to dehydration of water molecules physically adsorbed on surface (around 100°C) [45] and the loss of chemically bonded water in the samples (around 200°C) [46][47][48]. The endothermic DTA peak around 200°C is quite large, indicating that the content of chemically bonded water in the sample is high.…”

Section: Resultsmentioning

confidence: 99%

A three-dimensional nanostructured PANI/MnO x porous microsphere and its capacitive performance

et al. 2012

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Three-dimensional nanostructured polyaniline (PANI) and manganese oxide (MnO x ) composite porous microspheres were prepared by oxidizing aniline with KMnO 4 under interfacial chemical synthesis with 4-aminothiophenol (4-ATP) as the structure-directing agent on the Au substrate. Surface morphology and chemical composition of PANI/MnO x microsphere were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, thermo gravimetric-differential thermal analysis, and Fourier transform infrared spectrum. The result displayed that concentration of KMnO 4 played a key role in forming the 3D nanostructured porous microspheres. To obtain the regular shapes and uniform sizes of the porous microspheres, the optimal concentration of oxidant was 0.15 mol L -1 . The electrochemistry performances of PANI/MnO x microsphere were determined by cyclic voltammograms, electrochemical impedance spectroscopy, and galvanostatic charge-discharge. The specific capacitance of the 3D nanostructured PANI-MnO x porous microspheres exhibited a maximum value of 828 F g -1 at current density of 2 mA cm -2 over a potential range of 0.0-0.9 V versus SCE. It has improved 365 and 88 % comparing with that of PANI (178 F g -1 ) and MnO x (440 F g -1 ) obtained at the similar condition. The chargedischarge tests showed the PANI/MnO x microsphere possessed a good cycling stability. It maintained about 84.2 % of the initial capacitance after 1000 cycles at a current density of 2.0 mA cm -2 .

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“…4, two well-separated patterns are observed: an arc is obtained at frequencies high enough, which is related to interfacial processes; the low-frequency region of such plots indicated a capacitive behavior related to the film charging mechanism. The initial non-zero intersect with the real impedance axis at the beginning of the semicircle indicates the typical ESR value of all system [19,22] On the other hand, all spectra showed a clear semi-circle at the high frequency region, which corresponds to the charge transfer resistance (R ct ). The magnitude of the R ct can be derived from the difference in the real part of the impedance between low and high frequencies [1,23] Meanwhile, a comparison of the imaginary impedance (Z") data at the same frequencies for all the deposited films indicates that the capacitance for Ag-free MnO 2 film is higher than those of Ag-doped MnO 2 films.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 98%

Effect of Ag-Doping on the Capacitive Behavior of Amorphous Manganese Dioxide Electrodes

Hassan¹,

Suzuki²,

El‐Moneim³

2012

EEE

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Amorphous MnO 2 and Ag-doped MnO 2 thin films were galvanostatically deposited on a polished stainless steel substrate from 20 mM KMnO 4 aqueous solutions without and with AgNO 3 additions at cathodic current density of 1 mA/cm 2 for the application in electrodes of electrochemical supercapacitors. The supercapacitive properties of the deposited thin films have been studied in 0.5 M Na 2 SO 4 electrolyte by cyclic voltammetry, impedance spectroscopy, and charge-discharge measurement techniques. The Ag-free MnO 2 film showed better capacitive behavior and lower charge transfer resistance compared to the Ag-doped MnO 2 films. The specific capacitance and charge transfer resistance values for Ag-free MnO 2 films were 160 F/g at a scan rate 10 mV/s and 3.87 Ω, respectively. Cyclic stability using charge-discharge measurement technique indicates the excellent stability of Ag-free MnO 2 films and its possible use as a low cost electrode for supercapacitor applications.

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Synthesis of mesoporous polythiophene/MnO2 nanocomposite and its enhanced pseudocapacitive properties

Cited by 162 publications

References 50 publications

Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

A three-dimensional nanostructured PANI/MnO x porous microsphere and its capacitive performance

Effect of Ag-Doping on the Capacitive Behavior of Amorphous Manganese Dioxide Electrodes

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