苯酚在硼掺杂金刚石薄膜电极上的电化学行为研究

Electrochemical Behavior of Phenol at Boron-doped Diamond Electrodes

对苯酚在硼掺杂金刚石(Boron-doped diamond,BDD)薄膜电极上的电化学行为进行了研究,采用三电极体系以BDD电极为工作电极,利用循环伏安法研究了苯酚在电极上的电化学氧化过程。研究发现,苯酚在电极上的氧化反应为完全不可逆的电氧化反应,受扩散控制,多次循环伏安扫描后苯酚在电极表面易发生聚合形成聚合物薄膜,导致氧化峰电流下降,但在高于水的分解电压条件下电解,该聚合物薄膜可以被氧化分解,电极恢复活性。

The electrochemical behavior of phenol at boron-doped diamond （BDD） electrode was investigated by cyclic voltammetry test with a three-electrode system taking BDD electrode as wording electrode. The results showed that the oxidation of phenol was a completely irreversible reaction which controlled by diffusion step. Polymer film formed on the surface after several times of cyclic voltammetry scanning in phenol solution, leading to the decrease of the oxidation peak current. The electrode could be reactive by oxidation at the potential higher than water decomposition voltage with the polymer film decomposed.