Construction of TiO2 Nanotubes/C/MnO2 Composite Films as a Binder-Free Electrode for a High-Performance Supercapacitor

  • Zhirong Zhang
    Zhirong Zhang
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
  • Zhongping Yao*
    Zhongping Yao
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
    *E-mail: [email protected] (Z.Y.). Tel: (86)15663835116.
  • Yanqiu Meng
    Yanqiu Meng
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
    More by Yanqiu Meng
  • Dongqi Li
    Dongqi Li
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
    More by Dongqi Li
  • Qixing Xia
    Qixing Xia
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
    More by Qixing Xia
  • , and 
  • Zhaohua Jiang
    Zhaohua Jiang
    School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, P. R. China
Cite this: Inorg. Chem. 2019, 58, 2, 1591–1598
Publication Date (Web):January 10, 2019
https://doi.org/10.1021/acs.inorgchem.8b03094
Copyright © 2019 American Chemical Society
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Abstract

Although titanium dioxide (TiO2) exhibits excellent promise in electrode materials for supercapacitors, its poor conductivity and low areal specific capacitance hamper further development. In this work, we have designed a clever way to deposit manganese dioxide (MnO2) in order to improve its electrochemical performance via a facile and typical hydrothermal method. In a hydrothermal process, carbon (C), which deposited via new gas thermal penetration, acts as a reducing agent, while a potassium permanganate (KMnO4) solution acts as an oxidant. In this way, MnO2, which has a high theoretical capacity, is generated on TiO2 nanotube arrays (denoted as TNTs) successfully. Remarkably, a TNTs/C/MnO2 film prepared at a hydrothermal temperature of 90 °C and 0.3 g of KMnO4 revealed a superior electrochemical property with 55 mF/cm2 areal capacitance at a scan rate of 5 mV/s, 23 times more enhanced than that of a TNTs/C film. Also, the energy density of a TNTs/C/MnO2 film reached 46.8 Wh/cm2 when the power density was 0.12 mW/cm2, and the energy density still remained at 22.4 Wh/cm2 at a high power density of 0.8 mW/cm2. After 1000 cycle tests, 93.2% capacitance was still retained, indicating excellent reversibility and cycle stability of TNTs/C/MnO2 electrode. This work opens up a facile path for efficient growth of electrode materials with high performance for energy storage devices.

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