Graphene/MnO<sub>2</sub> composite prepared by a simple method for high performance supercapacitor

Yang, Yue; Zhang, Baoqing; Liu, J.; Long, Ya; Li, N.; Zhang, Wen; Jiang, Yongchao

doi:10.1179/1433075x15y.0000000021

Cited by 17 publications

(14 citation statements)

References 33 publications

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“…Graphite oxide, G, and NG all show the peak at 1720 cm −1 , which is ascribed to the C=O stretching. Another peak for G at 1214 cm −1 can be assigned to the C-O stretching [ 62 , 63 , 64 , 65 ]. For the N-containing composites (NG and x-NGM), the two main absorption peaks are at 1195 cm −1 and 1565 cm −1 , which are attributed to the C-N and C=N/C=C stretchings, respectively [ 66 , 67 ].…”

Section: Resultsmentioning

confidence: 99%

“…For graphite oxide and G, they have a strong energy peak centered at approximately 283.8 eV, which is assigned to the C=C bonds (sp 2 -hybridized carbon atoms). Another weak peak with higher binding energy at 285.6 eV can be assigned to the C-O bonds (oxygenated carbon atoms) [ 62 , 63 , 70 ]. There is a weaker peak for graphite oxide at 287.4 eV, which is assigned to the C=O bonds.…”

Section: Resultsmentioning

confidence: 99%

“…There is a weaker peak for graphite oxide at 287.4 eV, which is assigned to the C=O bonds. G shows an even weaker peak at 288.6 eV, which is assigned to the O-C=O bonds [ 52 , 62 , 63 , 70 ]. For NG and x-NGM composites, they also have energy peaks ascribed to the C=C bonds (symbol of the presence of G), centered at approximately 284.0 eV.…”

Section: Resultsmentioning

confidence: 99%

“…When the containing of Mn in x-NGM to diminish the C=C bonds and sp 2 -hybridized carbon atoms, the peak intensity is found to be weakened. Another two weaker peaks of NG and x-NGM, centered at approximately 285.3 eV and 286.6 eV, can be assigned to the C=N and C-N bonds, respectively [ 62 , 63 , 69 ], which stand for another evidence for the existence of N element in the composites.…”

Section: Resultsmentioning

confidence: 99%

“…Both graphite oxide and G show an energy peak ascribed to the C=O bonds at 531.8 eV and 532.7 eV, respectively. The three energy peaks of NG at 531.6 eV, 533.3 eV, and 535.7 eV, can be assigned to the bondings of O-C, O-H, and H 2 O, respectively [ 52 , 62 , 63 ]. The five x-NGM composites have similar O 1s spectra.…”

Section: Resultsmentioning

confidence: 99%

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Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Chiu

Cho

2018

Nanomaterials

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MnO2/N-containing graphene composites with various contents of Mn were fabricated and used as active materials for the electrodes of flexible solid-state asymmetric supercapacitors. By scanning electron microscopes (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrometer (XPS), fourier-transform infrared spectroscopy (FTIR) and Raman spectra, the presence of MnO2 and N-containing graphene was verified. The MnO2 nanostructures decorated on the N-containing graphene were of α- and γ-mixed phases. N-containing graphene was found to reduce the charge transfer impedance in the high-frequency region at the electrode/electrolyte interface (RCT) due to its good conductivity. The co-existence of MnO2 and N-containing graphene led to a more reduced RCT and improved charge transfer. Both the mass loading and content of Mn in an active material electrode were crucial. Excess Mn caused reduced contacts between the electrode and electrolyte ions, leading to increased RCT, and suppressed ionic diffusion. When the optimized mass loading and Mn content were used, the 3-NGM1 electrode exhibiting the smallest RCT and a lower ionic diffusion impedance was obtained. It also showed a high specific capacitance of 638 F·g−1 by calculation from the cyclic voltammetry (CV) curves. The corresponding energy and power densities were 372.7 Wh·kg−1 and 4731.1 W·kg−1, respectively. The superior capacitance property arising from the synergistic effect of mixed-phase MnO2 and N-containing graphene had permitted the composites promising active materials for flexible solid-state asymmetric supercapacitors. Moreover, the increase of specific capacitance was found to be more significant by the pseudocapacitive MnO2 than N-containing graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Chiu

Cho

2018

Nanomaterials

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Innovative approach for the synthesis of graphene/MnO₂ nanocomposites and their electrochemical behavior

Ossonon

Tavares

2021

Electrochemical Science Adv

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Graphene-manganese dioxide composites were prepared using a simple one step method consisting of the electrochemical exfoliation of graphite in the presence of KMnO 4 in 0.1 м H 2 SO 4 at low temperature . In these conditions, the freshly exfoliated graphene sheets (EG) spontaneously reduce the permanganate ions and EG sheets decorated with MnO 2 nanoparticles are obtained. This was confirmed by scanning electron microscopy coupled with energy dispersive Xray spectroscopy, transmission electron microscopy, X-ray diffraction, Raman, and X-ray photoelectron spectroscopies and thermogravimetric analysis. The electrochemical properties of EG@MnO 2 material were investigated and discussed. Electrodes based on the composite material exhibited enhanced capacitive performances compared to those made from pure graphene sheets. This was attributed to the synergic effect between the two components (graphene sheets and manganese dioxide nanoparticles) and to a larger porosity of the EG@MnO 2 electrode compared to the EG electrode. Additionally, over 91.6% of original capacitance was retained after 4000 cycles, indicating a very good cycling capability of the composite material. Remarkably, the composite electrode showed promising properties in aqueous medium by exhibiting a large and stable operating voltage up 2 V. The results presented in this article could serve as a guide for improving the energy density of supercapacitors in aqueous media.

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Facile and scalable fabrication of graphene/polypyrrole/MnOx/Cu(OH)2 composite for high-performance supercapacitors

Miankushki

Sedghi

Baghshahi

2018

J Solid State Electrochem

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Graphene/MnO₂ composite prepared by a simple method for high performance supercapacitor

Cited by 17 publications

References 33 publications

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Innovative approach for the synthesis of graphene/MnO₂ nanocomposites and their electrochemical behavior

Facile and scalable fabrication of graphene/polypyrrole/MnOx/Cu(OH)2 composite for high-performance supercapacitors

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Graphene/MnO2 composite prepared by a simple method for high performance supercapacitor

Cited by 17 publications

References 33 publications

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Innovative approach for the synthesis of graphene/MnO2 nanocomposites and their electrochemical behavior

Facile and scalable fabrication of graphene/polypyrrole/MnOx/Cu(OH)2 composite for high-performance supercapacitors

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Graphene/MnO₂ composite prepared by a simple method for high performance supercapacitor

Innovative approach for the synthesis of graphene/MnO₂ nanocomposites and their electrochemical behavior