Ti/SnO2+Sb2O3

Ti/SnO2+Sb2O3/PbO2 and Ti/SnO2+Sb2O3/RuO2+PbO2 electrodes were prepared and the electrocatalytic oxidation of phenol was studied in acidic media on the electrodes by bulk electrolysis experiments under galvanostatic control.The results clearly showed that the oxidation reactions of phenol followed first-order kinetics at all of three kinds of electrodes under experimental conditions and the electrode materials produced remarkable effects on apparent reaction rate and instantaneous current efficiency (ICE) of electrocatalytic oxidation of phenol.The apparent rate constants for Ti/SnO2+Sb2O3

Ti/SnO2+Sb2O3/PbO2 and Ti/SnO2+Sb2O3/RuO2+PbO2 electrodes were 6.66×10-2 min-1

2.49×10-2min-1 and 9.76×10-3min-1 at 25℃

respectively

and the initial ICEs were 78.7%

38.9% and 13.2% respectively.When Ti/SnO2+Sb2O3 electrode was used as anode and the phenol solution was electrolyzed for 60 min

the concentration of phenol decreased from 2.13×10-3 mol·L-1 to 3.27×10-5mol·L-1

and the conversion of phenol reached 98.5%

but the conversion was only 82.7% and 29.8% for Ti/SnO2+Sb2O3/PbO2 and Ti/SnO2+Sb2O3/[JP3]RuO2+PbO2 electrodes

respectively.The voltammograms of the anodes in the phenol solution revealed that there was a higher oxygen evolution potential for Ti/SnO2+Sb2O3 electrode

which was beneficial to the oxidation of organic compounds.