PREPARATION OF Pt/nano-TiO_2-CNT ELECTRODE AND ITS ELECTRO-OXIDATION FOR METHANOL

It is reported for the first time that the carbon nano-TiO_2-nanotubes supported Pt nanoparticles (Pt/nano TiO_2-CNT) composite catalysts were prepared by the precursor Ti(OEt)_4 directly hydrolyzed and electrodeposited at -0.05V vs. SCE .The results characterized by XRD and SEM shows that the nano TiO_2(anatase)particle size is about 5-10 nm and Pt nanoparticle (9nm) dispersed uniformly on nano TiO_2-CNT film surface. The electrocatalytic activity of Pt/nano TiO_2-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nano TiO_2-CNT electrode exhibited very high electrocatalytic activity and stability for the electro-oxidation of methanol in the room temperature. When Pt loading is 0.24 mg/cm~2, the oxidation current for methanol was 260 mA/cm~2, which is higher than Pt/nano TiO_2 electrode.