Improved electrochemical performance of graphene oxide supported vanadomanganate (IV) nanohybrid electrode material for supercapacitors |
| |
| Affiliation: | 1. Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education, Harbin Normal University, Harbin, 150025, PR China;2. Key Laboratory of Molecular and Cytogenetics College of Life Science and Technology, Harbin Normal University, Harbin, 150025, Heilongjiang Province, PR China;1. Department of Chemistry, National Institute of Technology Surathkal, Mangalore, India;2. Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, India;3. Department of Organic Chemistry, Indian Institute of Science, Bangalore, India;1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, Jiangsu, People''s Republic of China;2. Testing Center, Yangzhou University, Yangzhou, 225002, Jiangsu, People''s Republic of China;1. Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (UCM), Avenida Complutense s/n, ES 28040 Madrid, Spain;2. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Campus UAB, Bellaterra 08193, Barcelona, Spain;3. Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Campus de la UAB, E-08193 Bellaterra, Barcelona, Spain |
| |
| Abstract: | Graphene oxide (GO)-supported polyoxometalates (POMs) have been considered as promising electrode materials for energy storage applications due to their ability to undergo fast and reversible redox reactions. Herein, vanadomanganate-GO composites (K7MnIVV13O38.18H2O-GO with 2:1 and 4:1 ratio) were investigated for use as potential electrode materials in supercapacitors (SCs). The K7MnIVV13O38.18H2O (MnV13) was synthesized and anchored on GO through electron transfer interaction and electrostatic interaction to make the composite electrodes for the present study. All synthesized electrode materials were fully characterized by various techniques, e.g., Fourier Transform Infrared (FTIR) Spectroscopy, Powder X-ray Diffraction (XRD), Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDS) and High Resolution-Transmission Electron Microscopy (HR-TEM). The electrochemical properties of MnV13/GO composites with different MnV13/GO ratios were investigated by two-electrode cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD) in different electrolytes. The MnV13/GO composite of ratio 2:1 in 1 M LiCl electrolyte and that of ratio 4:1 in 1 M Na2SO4 electrolyte showed significant specific capacitance values of 269.15 F/g and 387.02 F/g, respectively and energy density of 37.38 Wh/kg and 53.75 Wh/kg, respectively for a scan rate of 5 mV/s. Interestingly, the 1:1 (MnV13/GO) composite in 1 M Na2SO4 and 1 M LiCl electrolytes showed very low specific capacitance values as the deposition of MnV13 on GO was not sufficient, as indicated by FTIR and SEM. Thus, it is evident that the specific capacitance value of these composite materials depends on the amount of MnV13 deposited on GO and these composite materials exhibit the potential to improve the performance of GO-based SCs. |
| |
| Keywords: | Vanadomanganate Graphene oxide Supercapacitors Cyclic voltammogram Two-electrode system |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
