A coralliform-structured γ-MnO 2 /polyaniline nanocomposite for high-performance supercapacitors
| Autor: | Tao Feng, Xie Aijuan, Lina Hu, Wenliang Sun, Chao Yao, Xiang Du, Chao Jiang, Luo Shiping, Yanfang Li |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Nanocomposite Scanning electron microscope General Chemical Engineering Composite number Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Analytical Chemistry Dielectric spectroscopy chemistry.chemical_compound chemistry Polyaniline Electrochemistry Fourier transform infrared spectroscopy Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Journal of Electroanalytical Chemistry. 789:29-37 |
| ISSN: | 1572-6657 |
| Popis: | The different crystallographic structures of manganese dioxide (α-MnO 2 , β-MnO 2 , γ-MnO 2 and δ-MnO 2 ) were prepared via simple and feasible methods. Among four crystallographic structures, γ-MnO 2 exhibited the best electrochemical property and was chosen to compound γ-MnO 2 /polyaniline (PANI) composite electrode through in situ synthesis techniques. The as-prepared samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The electrochemical properties of as-prepared samples influenced by the different mass ratios, scan rates, and current densities were mainly investigated by cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS), and cycle life, respectively. The results showed that the specific capacitance can be up to 493 F g − 1 as mass ratio of γ-MnO 2 /PANI was 1:5 at current density of 0.5 A g − 1 , suggesting the γ-MnO 2 /PANI (1:5) composite as an electrode material for super capacitors has great development prospects. |
| Databáze: | OpenAIRE |
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