Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol

Xia Li,

Jing Yan,

Kaigui Zhu*Email

School of Physics, Beihang University, 9 South Third Street, Shahe Higher Education Park, Changping District, Beijing 102206, China

Abstract

An optimized metal oxide electrode was prepared via the simple thermal decomposition method to improve the stability and electro-catalytic properties. It was found that Pt doping could effectively change the surface morphology. The Ti/Pt-Sb-SnO2 electrode possess compact and uniform surface packed with a large number of small particles. Besides, the influence of the Pt on the electrochemical performance was analyzed in detail. The oxygen evolution potential of Ti/Pt-Sb-SnO2 electrode decreased slightly, but it showed a smaller charge transfer resistance (0.2 Ω·cm2 versus 1.67 Ω·cm2) and a longer service lifetime which is almost 24-times longer than that of Ti/Sb-SnO2 (73 h versus 3h). Finally, electro-catalytic oxidation of phenol was employed. In the electro-catalytic process both phenol and its possible intermediates were more rapidly decomposed on the Ti/Pt-Sb-SnO2 electrodes. The removal of chemical oxygen demand (COD) was 95.56% and 56.31% on the Ti/Pt-Sb-SnO2 and Ti/Sb-SnO2 electrodes, respectively. And the corresponding instantaneous current efficiency (ICE) of Ti/Pt-Sb-SnO2 electrode was higher than that of Ti/Sb-SnO2. Based on the experimental results, the prepared Ti/Pt-Sb-SnO2 electrode has better stability and excellent phenol electro-catalytic ability, further signifying that it has a good potential application prospect in the field of wastewater.

Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol