中间态粒子对肉桂醇电化学氧化的影响

Influence of Mediators on the Electrooxidation of Cinnamic Alcoho

讨论了中间态粒子（ｍｅｄｉａｔｏｒ）ＭｎＯ２和ＰｂＯ２对肉桂醇电催化反应的影响。由于二者氧化电位的差异，从而改变了肉桂醇氧化反应生成物的组成。以ＭｎＯ２为中间态粒子时，肉桂醇氧化后的主要生成物是肉桂醛，电流效率高达８０％以上。以ＰｂＯ２为中间态粒子时，肉桂醛将进一步被氧化成肉桂酸，电极反应的选择性明显降低。

Lead dioxide and manganese dioxide were used as mediator for indirect oxidationof cinnarnic alcohol on solid polymer electrolyte(SPE)composite electrode prepared by de-positing a porous platnium layer on Nafion. When MnO2 was used, cinnamic aldehyde wasthe main product of oxidatior1 with current efficieny up to 80%。 In the case of PBO2 a fur-ther oxidatinn of aldehvde to cinnamic acid and an obvious decrease of reaction selectivity onthe electrode were observed.