Abstract
A hydrothermal methodology followed by calcinations employed for the formation of CeO2 - MnO2 /CNF composite to meet the requirement of superior electrochemical energy storage and sensing performance. The growth of agglomerated tiny CeO2 clusters grown with needle shaped MnO2 decorated over CNF surface gives rise to efficient hybrid sensing and electrode material. The surface structure and chemical features of as prepared nanocomposite was characterized by SEM (scanning electron microscopy), TEM (transmission electron microscopy), FTIR spectroscopy and UV- Visible spectroscopy. The crystalline phase of CeO2-MnO2 decorated over CNF substrate was analyzed by XRD (X-ray diffraction spectroscopy). The electrochemical studies of synthesized sample of CeO2-MnO2/CNF composite exhibited specific capacitance as 1453 Fg−1 at 10 mVs−1 scan rate in 1 M Na2SO4 electrolyte and provided appreciable 74% of capacitive retention after 2500 cycles. The electrode material exhibits superior energy density (ED) of 57 WhKg−1 and power density (PD) 1.8 KWKg−1. The fabricated composite CeO2- MnO2 /CNF also tested as sensing material for H2O2 and offered good sensitivity of 612 μAcm−2mM−1 with correlation coefficient (R) 0.996 up to very low detection limit of 0.1 μM.
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