Improvement of Electrocatalytic Activity of Titanium Based Electrodes Consisting of RuO_2 (0.5)-Co_3O_4(0.5)by Cerium Doping

Ti-supported Ce-doped RuO,(0.5)-Co3O4(0.5) electrodes were prepared by using thermaldecomposition at 400℃,where the dosage of CeO2 was optimizedfor improving the electrocatalytic performance of the electrodes.The oxygen evolution electrocatalytic activity of the resultingCe-doped electrodes in 1.0 mol/L KOH solution was studied byrecording open-potential,cyclic voltammogram and polarizationcurves.Results show that doping of CeO2 contributes to greatlyimproved electrocatalytic activity of the electrodes.Typically,theelectrodes doped with CeO2 at a ratio of 10:4 showed the bestelectrocatalytic performance,with the greatest voltammetriccharge of 806 mC.cm-2,the maximum surface roughness of3047.83 and the lowest apparent activation energy of 15.74kJ/mol.Rare-earth Ce could act as a hole initiator and increasethe dispersion of grains of active oxide,leading to increased ac-tive surface area of the electrodes and improved electrocatalyticactivity for oxygen evolution.