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Study on the Mechanism of the Anodic Oxidation of PAN-Based Carbon Fibers by Cyclic Voltammetry

The cyclic voltammograms (CVs) of polyacrylonitrile (PAN)-based carbon fibers (CFs) were measured in different electrolyte aqueous solutions, temperatures and concentrations. By analyzing the CVs, the mechanism of the anodic oxidation of PANbased CFs was investigated. The results show that the anodic oxidation of CFs is virtually the activated oxygen formed by oxygen evolution reaction of water reacts with the surface carbon of CFs. Although there are more activated oxygen formed in alkaline electrolytes, surface oxides of CFs are easier to be formed in acidic electrolytes. The higher temperature can make the oxygen evolution reaction of water and surface oxidation of CFs be easier and more violent. The variation in electrolyte concentration can affect intensity of the two reactions, whereas it does not affect the difficulty of the reactions.