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 shu

Hydrothermal Synthesis of Al-Doped α-MnO₂ Nanotubes and Their Electrochemical Performance for Supercapacitors

1.
School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, P. R. China

Received Date: 9 September 2014
Available Online: 2 February 2015
Fund Project: 上海市教委创新重点项目(13ZZ139) (13ZZ139) 上海第二工业大学校级重点培育学科(材料科学)建设(XXKPY1302) (材料科学)建设(XXKPY1302)

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.
- α-MnO₂,
- Al doping,
- Nanotube,
- Supercapacitor,
- Electrochemical capacitor
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Hydrothermal Synthesis of Al-Doped α-MnO2 Nanotubes and Their Electrochemical Performance for Supercapacitors

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通讯作者: 陈斌, bchen63@163.com

Hydrothermal Synthesis of Al-Doped α-MnO₂ Nanotubes and Their Electrochemical Performance for Supercapacitors