The β-PbO 2 of a Ti/Sn-SbO x /PbO 2 electrode was modified with polydimethylsiloxane (PDMS) (Ti/Sn-SbO x /PbO 2 -PDMS) through a facile electrodeposition method. The results from scanning electron microscopy, energy-dispersive spectrometry and X-ray diffraction demonstrated that the PDMS was irreversibly adsorbed on the β-PbO 2 of Ti/Sn-SbO x /PbO 2 -PDMS, leading to a decrease in the crystal size, surface cracks and preferential growth trend of β-PbO 2 . Compared with its PDMS-unmodified counterparts, the Ti/Sn-SbO x /PbO 2 -PDMS electrode exhibited relatively higher activity, selectivity and stability in the anodic oxidation of p -chlorophenol. Moreover, the Ti/Sn-SbO x /PbO 2 -PDMS electrode was more stable than the Ti/Sn-SbO x /PbO 2 electrode, as evidenced by the accelerated life test. Based on the quantitative measurements of contact angle, hydroxyl radicals (HO•) and the initial surface concentration of various p -substituted phenols, including p -cresol, p -methoxyphenol, phenol, and p -chlorophenol, and with the help of electrochemical characterization of linear sweep voltammetry, it could be concluded that the improved electrochemical activity and stability of Ti/Sn-SbO x /PbO 2 -PDMS originated from the enhanced hydrophobicity of the electrode surface. Different from a traditional Ti/Sn-SbO x /PbO 2 electrode with adsorbed HO• as the dominant active species, the Ti/Sn-SbO x /PbO 2 -PDMS with a hydrophobic surface favors the generation of more free HO•.
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He et al. (2018) studied this question.
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