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The refractory organic pollutant (phenol) was electro-catalytic-oxidized on the Sb-doped SnO 2 anode prepared by coating pyrolysis method. The effect of electrolysis potential on phenol degradation has been studied. It is proved that the degradation rate has a parabola shape relationship with applied electrolysis potential, and 2 V is the most optimistic potential in our research. In situ cyclic voltammogram and Ultraviolet-visible spectrum were carried out to track the process of phenol oxidation and speculate the intermediate reaction process. All the results implied that phenol was oxidized through different pathways under different electrolysis potentials. The phenomena confirm the conclusion that when degradation voltage was 2 V, phenol was directly oxidized rather than through the process of benzoquinone intermediate, which happened under other potentials, and the direct oxidation pathway was more efficient. Based on experimental results and the previous reports by other researchers, reaction pathways proposed in our research are given.

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