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(a) Polarization curves and (b) Nyquist plots of CoOx–NC-1.0 and contrast samples. (c) Linear scan curve (LSV) of CoOx–NC-0.8, CoOx–NC-1.0, and CoOx–NC-1.5. (d) Tafel plots of CoOx–NC-0.8, CoOx–NC-1.0, and CoOx–NC-1.5. (e) Long-term stability test of CoOx–NC-1.0. All the electrochemical tests were conducted in 1.0 M KOH.
