Potentiodynamic analysis of surface oxides on carbon blacks

Abstract The potentiodynamic sweep technique was applied to detect surface oxides on carbon black (Vulcan XC-72) which was subjected to heat treatment, electrochemical and chemical oxidation and gas phase oxidation. The quinone-hydroquinone redox couple was observed in the potential range 50–1280 mV (vs n.h.e.). Analysis of the current-voltage curves yielded surface concentrations of 10−10–10−11 moles/cm2 in agreement with other techniques. The various oxidation procedures resulted in an increase in surface oxide whereas heat treatment caused a decrease.

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