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(a) Nyquist plots recorded for pristine Cu2O and three different Cu2O/GR composites deposited with 1 C cm–2 charge density, in 0.1 M sodium acetate solution at open circuit potential, in the 0.1 Hz to 10 kHz frequency range. (b) Measured (points) and simulated (solid line) Nyquist and (c) Bode-plots of a Cu2O/GR electrode. The inset in (b) shows the error associated with the Bode plot fit (i.e., difference between the measured and calculated value).
