MoOx, a non-noble secondary catalyst instead of noble metal Ru, was dispersed on carbon nanotubes (CNT) and then the primary catalyst Pt was electrodeposited on MoOx/CNT/graphite electrode by potential-step method. ...MoOx, a non-noble secondary catalyst instead of noble metal Ru, was dispersed on carbon nanotubes (CNT) and then the primary catalyst Pt was electrodeposited on MoOx/CNT/graphite electrode by potential-step method. CNT used was grown directly on graphite disk by chemical vapor deposition. The Pt-MoOx/CNT/graphite electrode was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic property and the long-term cyclic stability of Pt-MoOx/CNT/graphite electrode for ethanol oxidation have been investigated in 1.0 mol/L CH3CH2OH+0.1 mol/L H2SO4 by cyclic voltammetry. On the other hand, the effect of the loading mass of MoOx on specific activity of Pt-MoOx/CNT/graphite electrode and the activation energy of ethanol oxidation were investigated. The Pt-MoOx/CNT/graphite electrode shows good long-term cyclic stability. 82% value of peak current density at the oxidation peak around 0.69 V (vs. SCE) remains after 500 cycles, which is higher than those of Pt/CNT/graphite and Pt-Ru/CNT/graphite electrodes with the corresponding values of 55% and 72%, respectively.展开更多
基金Project supported by the Program for New Century Excellent Talents in University (No. NCET-04-0765), the Natural Science Foundation of China (No. 50172014) and the Scientific Research Foundation for the Returned 0verseas Chinese Scholars, the Ministry of Education of China (No. 2001-498).
文摘MoOx, a non-noble secondary catalyst instead of noble metal Ru, was dispersed on carbon nanotubes (CNT) and then the primary catalyst Pt was electrodeposited on MoOx/CNT/graphite electrode by potential-step method. CNT used was grown directly on graphite disk by chemical vapor deposition. The Pt-MoOx/CNT/graphite electrode was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic property and the long-term cyclic stability of Pt-MoOx/CNT/graphite electrode for ethanol oxidation have been investigated in 1.0 mol/L CH3CH2OH+0.1 mol/L H2SO4 by cyclic voltammetry. On the other hand, the effect of the loading mass of MoOx on specific activity of Pt-MoOx/CNT/graphite electrode and the activation energy of ethanol oxidation were investigated. The Pt-MoOx/CNT/graphite electrode shows good long-term cyclic stability. 82% value of peak current density at the oxidation peak around 0.69 V (vs. SCE) remains after 500 cycles, which is higher than those of Pt/CNT/graphite and Pt-Ru/CNT/graphite electrodes with the corresponding values of 55% and 72%, respectively.