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Oxidation of vapor grown carbon fibers in a KOH aqueous solution

The weight loss rate of vapor grown carbon ﬁbers (VGCF) was investigated in a KOH aqueous solution during steady-state polarization measurements in the potential range 0.45 to 0.75 V against a Hg|HgO reference electrode. In particular, we mea-sured the amount of oxygen produced by a dissolved oxygen gas sensor and used the results to calculate the weight loss rate (Δ W ) of VGCF by the carbon oxidation reaction (COR). When the concentration of KOH was 0.1 M, the Δ W is almost same as that reported in a previous report. In addition, a decrease in the onset potential of COR as well as a signiﬁcant increase in the Δ W was found when the concentration of KOH was increased to 1.0 M.