Journal
RSC ADVANCES
Volume 5, Issue 106, Pages 87521-87527Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra09481j
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Funding
- National Natural Science Foundation of China [51572052, 21403044, 51472077]
- Heilongjiang Postdoctoral Fund [LBH-Z14054]
- Fundamental Research Funds for the Central Universities [HEUCF20151004]
- Program for New Century Excellent Talents in University [NCET-13-0779]
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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.
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