Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (03): 262-268. Previous Articles     Next Articles

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甲酸在Nd-Fe-WO42 -氰桥混配物修饰铂电极上的电催化氧化

马永钧*,杨梅霞,王伟峰,周敏,刘婧,李婷婷,陈慧   

  1. (省部共建生态环境相关高分子材料教育部重点实验室 甘肃省高分子材料重点实验室
    西北师范大学化学化工学院 兰州 730070)
  • 收稿日期:2010-06-11 修回日期:2010-08-02 出版日期:2011-02-14 发布日期:2010-10-09
  • 通讯作者: 马永钧 E-mail:mayj@nwnu.edu.cn
  • 基金资助:

    稀土掺杂类普鲁士蓝纳米有序结构化学修饰电极在环境、食品分析中的应用

Electrocatalytic Oxidation Behavior of Formic Acid at Platinum Electrode Modified with Nd-Fe-WO 42-Cyanide-bridged Mixed Complexes

MA Yong-Jun, YANG Mei-Xia, WANG Wei-Feng, ZHOU Min, LIU Jing, LI Ting-Ting, CHEN Hui   

  1. (Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, Key Laboratory of Polymer Material of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070)
  • Received:2010-06-11 Revised:2010-08-02 Online:2011-02-14 Published:2010-10-09
  • Contact: Yong-Jun MA E-mail:mayj@nwnu.edu.cn

Nd-Fe-WO cyanide-bridged mixed complexes modified platinum electrode was successfully prepared by using electrodeposition method for the first time. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to characterize the morphology and crystalline lattice structure of the modified materials. Formic acid electrocatalytic oxidation behavior on this modified electrode was evaluated by means of cyclic voltammetry and chronoamperometry. The results indicated that the electrocatalytic oxidation current density of formic acid on modified electrode was about 10 times more than on bare Pt electrode, and CV anodic limit potential had significant effect on peak figuration of absorption intermediate in the reverse scan. Moreover, the influence of H and SO concentration in electrolyte solution on the voltammetric characteristics of formic acid electrocatalytic oxidation was also studied, it showed that the main oxidation peak s potential increased with increasing H concentration, however, decreased with increasing SO concentration, but being coexistence of H and SO , the effect of H played a dominant role. This phenomenon revealed that the rate-determining step of electrocatalytic oxidation of formic acid on modified electrode was correlative with de-protonation process, and the adsorption of SO /HSO would promote the forward oxidation reaction. These conclusions provided new experimental evidences for explaining the mechanism of formic acid electrocatalytic oxidation. Meanwhile, the electrode stability experiments as well as chronoamperometry also demonstrated that the newly developed modified electrode possessed much better electrocatalytic activity and tolerance to toxic intermediate contamination.

Key words: formic acid, electrocatalytic oxidation, cyanide-bridged mixed complexes, modified electrode