Fig. 2. Fourier-transform infrared spectra of the composite electrode, HBU671, and the activated carbon.
Fig. 3. Scanning electron microscopic surface images of the activated carbon (a,b) and composite electrode (c,d) at low and high magnification.
Fig. 4. Cyclic voltammograms of composite electrodes (a) compared with activated carbon at 100 mV s-1 and (b) at different scan rates.
Fig. 5. Specific capacitances of the activated carbon and the composite electrodes as a function of scan rate and cycle number at 500 mV/s.
Fig. 6. Nyquist plots of activated carbon, HBU671, and the composite electrodes.
Fig. 7. Charge-discharge graphs of activated carbon and the composite electrodes, measured at 5.0 mA cm-2.
Fig. 1. (a) Synthesis of HBU671, (b) Mechanism of HBU671 redox reaction in electrode, and (c) Mechanism of redox reaction of quinone.
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