Promotion effect of platinum electrode modified by phosphomolybdic acid on dimethyl ether electrochemical oxidation

作者：Chen Jinwei; Zeng Jie; Jiang Chunping; Wang Yaohui; Zhao Beijun; Zhu Shifu; Wang Ruilin

来源：Chinese Journal of Catalysis, 2007, 28(8): 725-729.

• platinum
• phosphomolybdic acid
• cyclic voltammetry
• dimethyl ether
• electrooxidation
• fuel cell
• electrocatalysis

A Pt electrode modified by H3PMo12O40(PMo12) was prepared by cyclic voltammetry. The preparation process showed that more PMo12 was adsorbed on the surface of the bare Pt electrode when the number of scanning increased at the beginning, but finally the total adsorbed amount reached saturation. The electrooxidation of dimethyl ether (DME) was studied on the surface of the PMo12-modified Pt electrode by cyclic voltammetry. The results showed that the Pt electrode modified by PMo12 had higher activity for DME oxidation, and its onset potential had a negative shift of 50 mV. The peak current density was enhanced more than 1.86 times with the negative shift of 35 mV on its peak potential, compared with the unmodified electrode. There was a positive current peak at the reverse scan, which was different from the literature. This might indicate the change of the mechanism for DME oxidation on the modified electrode surface. The peak could response methanol oxidation, and the methanol was more likely the mid-product of DME oxidation at the PMo12-modified Pt electrode. The experimental results also showed that the decrease of scan rate put more PMo12 on the surface of the bare Pt electrode, however, the activity for DME oxidation was reduced due to the decrease of the effective sites on the surface of the Pt electrode.

• 出版日期2007-8
• 单位四川大学