Effect of Sb dopant amount on the structure and electrocatalytic capability ofTi/Sb-SnO2 electrodes in the oxidation of 4-chlorophenol
KONG Jiang-tao , SHI Shao-yuan , ZHU Xiu-ping , NI Jin-ren
DOI:
Received February 01, 2007,Revised May 08, 2007, Accepted , Available online
Volume 19,2007,Pages 1380-1386
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Ti/Sb-SnO2 anodes were prepared by thermal decomposition to examine the influence of the amount of Sb dopant on the structure
and electrocatalytic capability of the electrodes in the oxidation of 4-chlorophenol. The physicochemical properties of the Sb-SnO2
coating were markedly influenced by di erent amounts of Sb dopant. The electrodes, which contained 5% Sb dopant in the coating,
presented a much more homogenous surface and much smaller mud-cracks, compared with Ti/Sb-SnO2 electrodes containing 10% or
15% Sb dopant, which exibited larger mud cracks and pores on the surface. However, the main microstructure remained unchanged
with the addition of the Sb dopant. No new crystal phase was observed by X-ray di raction (XRD). The electrochemical oxidation of
4-chlorophenol on the Ti/SnO2 electrode with 5% Sb dopant was inclined to electrochemical combustion; while for those containing
more Sb dopant, intermediate species were accumulated. The electrodes with 5% Sb dopant showed the highest e ciency in the bulk
electrolysis of 4-chlorophenol at a current density of 20 mA/cm2 for 180 min; and the removal rates of 4-chlorophenol and COD were
51.0% and 48.9%, respectively.
