• 文献标题:   Reduced graphene oxide decorated on MnO2 nanoflakes grown on C/TiO2 nanowire arrays for electrochemical energy storage
  • 文献类型:   Article
  • 作  者:   YANG SN, YAN P, LI YJ, CHENG K, YE K, ZHANG CY, CAO DX, WANG GL, LI Q
  • 作者关键词:  
  • 出版物名称:   RSC ADVANCES
  • ISSN:  
  • 通讯作者地址:   Harbin Engn Univ
  • 被引频次:   6
  • DOI:   10.1039/c5ra09481j
  • 出版年:   2015

▎ 摘  要

In this work, RGO is decorated on MnO2 nanoflakes, which are electrochemically deposited on preformed C/TiO2 shell/core nanowire arrays to form a RGO/MnO2/C/TiO2 shell/core array electrode. Their structure and surface morphology are studied using X-ray diffraction analysis, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Raman microscopy, scanning electron microscopy and transmission electron microscopy. The results suggest that a RGO layer was coated on the MnO2 nanoflakes, and the MnO2 nanoflakes have a well-distributed coverage on the surface of the C/TiO2 shell/core nanowire arrays. The RGO/MnO2/C/TiO2 shell/core arrays are evaluated as a supercapacitor electrode material, which exhibits a high specific capacitance of 822.3 F g(-1) at a charge/discharge current density of 1 A g(-1) and 87.4% specific capacitance retention after 5000 cycles. The superior pseudo-capacitive properties may be due to the unique shell/core structure and the decoration of RGO. The RGO decorated on MnO2 can provide partial double-layer capacitance; on the other hand, the RGO can improve the electrical conductivity of the electrode and alleviate the volume change of MnO2 during charge/discharge processes given its mechanical flexibility. Our results show that the RGO/MnO2/C/TiO2 electrode can be regarded as advantageous for electrochemical energy applications.