苯甲酸在疏水性复合电极上的电化学还原行为

摘要

以铜片和锌片为基材,复合电镀制得Cu-PTFE(聚四氟乙烯)和Zn-PTFE疏水性复合电极,并将复合电极应用于苯甲酸的电化学还原行为研究.测定了复合电极在电解液中的Tafel极化曲线、循环伏安、电极稳定性和交流阻抗等电化学参数.结果表明,在苯甲酸电还原制备苯甲醛中,Cu-PTTE复合电极相对于Zn-PTFE复合电极具有较高的催化活性,其电还原产率分别为88.4％和79.2％,因此,Cu-PTFE复合电极有望成为苯甲酸电化学还原制备苯甲醛的电极材料.电化学行为的研究结果显示,苯甲酸在疏水性复合电极上的电还原过程可能只受电子迁移过程控制.%Hydrophobic Cu-polytetrafluoroethlyene ( Cu-PTFE ) and Zn-PTFE composite electrodes were prepared by composite electroplating with copper and zinc as substrates, respectively. The electrochemical reduction behavior of benzoic acid on hydrophobic composite electrodes was studied. The electrochemical parameters such as Tafel polarization curve, cyclic voltammograin(CV) , electrode stability and electrochemical impedance spectroscopy (EIS) were investigated. The results show that the Cu-PTFE composite electrode possesses a higher catalytic activity in the preparation of benzaldehyde from benzoic acid than that of Zn-PTFE composite electrode, the yields of the electrochemical reduction on Cu-PTFE and Zn-PTFE composite electrodes are 88.4% and 79. 2% , respectively. The Cu-PTFE composite electrode is promising as an electrode for preparation of benzaldehyde via electrochemical approach. The result shows that the electrochemical reduction of benzoic acid on the composite electrodes may be exclusively controlled by electron transfer process.