中华医学超声杂志

应用化学 ›› 2011, Vol. 28 ›› Issue (05): 583-589.DOI: 10.3724/SP.J.1095.2011.00410

• 研究论文 • 上一篇    下一篇

马来酸在多孔铅锌电极上电还原特性

李彩彩,王森林*,张艺   

  1. (华侨大学材料科学与工程学院应用化学系，福建省高校功能材料重点实验室 厦门  361021)
  • 收稿日期:2010-07-13 修回日期:2010-10-06 出版日期:2011-05-10 发布日期:2011-05-10
  • 通讯作者: 王森林，教授; Fax:0592-6162221; E-mail:slwang@hqu.edu.cn; 研究方向：电化学和新型金属功能材料

Electrochemical-reduction Characteristics of Maleic Acid on a Porous Pb-Zn Electrode

LI Caicai, WANG Senlin*, ZHANG Yi   

  1. (Department of Applied Chemistry,College of Materials Science and Enigeering,Huaqiao University,
    Key Laboratory for Functional Materials of Fujian Higher Eduction,Xiamen 361021)
  • Received:2010-07-13 Revised:2010-10-06 Published:2011-05-10 Online:2011-05-10

PDF

1539

被引次数

7 | 2

摘要：

在甲磺酸镀液中电沉积Pb-Zn镀层，然后用体积分数为10%的H2SO4腐蚀镀层，使镀层中的Zn脱溶，成功得到多孔Pb-Zn电极，该镀层由铅(Fm3m)和锌（P63/mmc）的混合物组成。 采用循环伏安、阴极极化、计时电量及电化学阻抗等方法，研究了马来酸在多孔Pb-Zn电极和Pb电极上的电化学还原特性。 结果表明，马来酸在电极上先发生吸附，然后进行不可逆电子传递反应；马来酸在Pb电极和多孔Pb-Zn电极上还原的扩散系数分别为1.2×10-7和1.7×10-7 cm2/s；随着温度升高，马来酸在Pb电极上表观交换电流密度稳定性不如多孔Pb-Zn电极，多孔Pb-Zn电极上马来酸在低温处i0与温度呈线性关系，从50 ℃开始，i0急剧增加，至65 ℃，i0迅速下降，其在多孔Pb-Zn电极上电还原在50～60 ℃最好。 马来酸在多孔Pb-Zn电极比相应的Pb电极上具有更高的电催化活性。

关键词: 多孔Pb-Zn 电极, 马来酸, 电还原, 丁二酸

Abstract:

A Pb-Zn coating was electroplated from methyisulfonic acid bath. The coating was then corroded by 10%H2SO4(volume fraction) solution to dissolve zinc. A porous Pb-Zn electrode was therefore successfully prepared. The Pb-Zn coating was composed of Pb(Fm3m) and Zn(P63/mmc). Electrochemical reduction characteristics of maleic acid(MA) on porous Pb-Zn and Pb electrodes were investigated by voltammetry, cathode polarization, chronocoulometry, and electrochemical impedance spectrum(EIS). As a result, MA was absorbed on the electrode surface, and then underwent irreversible electron-transfer reaction. The corresponding diffusion coefficients for MA in H2SO4 solution on a Pb and porous Pb-Zn electrode was 1.2×10-7 and 1.7×10-7 cm2/s, respectively. The apparent exchange current density(i0) of MA on a porous Pb-Zn electrode was steadier than that on a Pb electrode. The i0 of MA on the porous Pb-Zn electrode had a linear relationship with temperature in low temperature, and increased sharply above 50 ℃, while decreased rapidly when reached to 65 ℃. The best electrochemicalreduction temperature for MA on porous Pb-Zn electrode was 50~60 ℃. The catalytic activity of MA on porous Pb-Zn electrode was higher than that on lead electrode.

Key words: Porous Pb-Zn electrode, Maleic acid, Electro-reduction, succinic acid

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