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Porous NiO/C Nanocomposites as Electrode Material for Electrochemical Supercapacitors
journal contribution
posted on 2013-09-03, 00:00 authored by Subbukalai Vijayakumar, Sadayappan Nagamuthu, Gopalan MuralidharanNiO/C nanocomposites were synthesized
at different calcination
temperatures using starch as the stabilizing agent. The NiO/C nanocomposites
were characterized by thermogravimetric analysis (TGA), X-ray diffraction
(XRD), Fourier transform infrared spectroscopy (FTIR), field emission
scanning electron microscopy (FESEM), and transmission electron microscopy
(TEM). The samples calcined at 500 °C exhibit a highly porous
nature. Electrochemical investigations of NiO/C were carried out using
cyclic voltammetry, chronopotentiometry, and electrochemical impedance
spectroscopy. NiO/C-5 shows excellent electrochemical performance
compared to NiO/C-4 and NiO/C-6. The NiO/C-5 electrode exhibits a
specific capacitance value of 644 F g–1 at a scan
rate of 2 mV s–1. The charge transfer resistance
is 0.59 Ω for the NiO/C-5 electrode. This NiO/C-5 appears to
be a promising electrode material for supercapacitor applications.
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thermogravimetric analysiselectrochemical impedance spectroscopycyclic voltammetrycapacitance valuesamples calcinedelectrode materialXRDTEMscan rateelectrochemical performanceElectrochemical investigations2 mVFTIRcalcination temperatures0.59 ΩFESEMtransmission electron microscopyNiOsupercapacitor applicationsTGAElectrode Materialcharge transfer resistance
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