Citation:
LI Yang, XIE Hua-Qing, LI Jing. Hydrothermal Synthesis of Al-Doped α-MnO2 Nanotubes and Their Electrochemical Performance for Supercapacitors[J]. Acta Physico-Chimica Sinica,
;2015, 31(4): 693-699.
doi:
10.3866/PKU.WHXB201502021
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α-MnO2 and Al-doped α-MnO2 were synthesized via a hydrothermal method. The morphologies, structures, and electrochemical performances of as-synthesized un-doped and doped α-MnO2 were studied. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) show that these un-doped and doped α-MnO2 are nanotube shaped. The band gaps of α-MnO2 are investigated by ultraviolet-visible absorption spectroscopy, which indicates that the band gap of α-MnO2 decreases upon Al doping. The electrochemical performances of un-doped and doped α-MnO2 as electrode materials for supercapacitors were measured by cyclic voltammetry (CV) and galvanostatical charge/discharge tests. The specific capacitances of un-doped and Al-doped α-MnO2 respectively reach 204.8 and 228.8 F·g-1under a current density of 50 mA·g-1. It was discovered that the electrochemical impedance of Al-doped α-MnO2 was decreased by Al doping analyzed using electrochemical impedance spectra (EIS), which provides a beneficial increase to its electrochemical specific capacitance. Enhanced specific capacitance and preferable cycling stability (up to 1000 cycles) for Al-doped α-MnO2 mean that these systems are favorable prospects for application in supercapacitors.
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Keywords:
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α-MnO2
, - Al doping,
- Nanotube,
- Supercapacitor,
- Electrochemical capacitor
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