Abstract
The luminescent electrooxidation of methanol in aqueous sodium hydroxide on a glassy carbon electrode has been characterized. Two different mechanisms appear to exist, depending on both the CH 3OH concentration and the potential. A major mechanism may be associated with the electrooxidation of the methoxide ion (CH 3O −) to formaldehyde (HCHO) via disproportionation of anodically generated methoxyl radicals (CH 3O ·). This mechanism is predominant when the CH 3OH concentration is ⩽0.1 M, and results in luminescence with a broad spectral distribution (peak around 550 nm). Another major mechanism may involve the production of excited singlet oxygen ( 1O 2) via a tetraoxide. Either with higher CH 3OH concentrations or at more positive potentials, the latter pathway predominates, producing red luminescence with a peak at around 640 nm.
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