Abstract
The electrochemical oxidation of HOPG (highly oriented pyrolytic graphite) was investigated in sulfuric acid solution at less than 1.0 V vs. NHE to clarify the oxidation mechanism of electrode material in polymer electrolyte fuel cells. It was found by surface analysis with X-ray photoelectron spectroscopy that several kinds of oxygenated functional groups were formed dependently on the potential. Furthermore, C-Br peaks were detected on the surface of HOPG after immersion in hydrobromic acid solution following holding at 1.0 V for 15 h. This suggests that lactones were formed in the course of electrochemical oxidation of HOPG.
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