Fig. 1. Preparation of ultrasonic assisted (a) Chemically activated carbon(UCA), (b) physically activated carbon (UPA)from corn cob.
Fig. 2. XRD graph for chemically activated carbon(CA) and ultrasonic assisted chemically activated carbon(UCA).
Fig. 3. FTIR graph for a) raw corn cob (CC), b) chemically activated carbon(CA) and c) ultrasonic assisted chemically activated carbon(UCA).
Fig. 4. SEM images of (a) ultrasonic assisted chemically activated corn cob; (b)ultrasonic assisted physically activated corn cob; (c) Manganese and nitrogen doped corn cob.
Fig. 5. EDS for (a) ultrasonic assisted chemically activated corn cob; (b) ultrasonic assisted physically activated corn cob (c) Manganese and nitrogen doped corn cob.
Fig. 6. Cyclic voltammetric curves for UCA, UPA and Mn/N-Cat scan rate 50mV/s in 1M sodium sulfate.
Fig. 7. Galvanostatic charge and discharge curves for (a) UCA, (b) UPA, (c) Mn/N-Cat various current densities in 1M sodium sulfate.
Fig. 8. a) The EIS Nyquist plot of the two electrode materials (inset equivalent circuit model of the electrodes), b) Bode plot of phase versus frequencyc) Bode plot of total impedance versus frequency.
Table 1. Functional groups present in the structure of corn cob
Table 2. Comparison of specific capacitance of UCA, UPA, Mn/N-C using cyclic voltammetry at 50mV/s in 1M sodium sulfate
Table 3. Comparison of specific capacitance of UCA at various current densities in 1M sodium sulfate
Table 4. Comparison of specific capacitance of UPA at various current densities in 1M sodium sulfate
Table 5. Comparison of specific capacitance of Mn/N-C at various current densities in 1M sodium sulfate
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