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Potentiodynamic analysis of surface oxides on carbon blacks

✍ Scribed by K. Kinoshita; J.A.S. Bett

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 803 KB
Volume: 11
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(73)90080-8

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✦ Synopsis

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-'"-lO-ll moles/cm* 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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