双层聚吡咯/普鲁士蓝复合膜的制备与性能研究

Preparation and properties of double Ppy/PB composite film

采用层层电沉积方法制备了双层聚吡咯/普鲁士蓝复合膜修饰复合陶瓷碳电极(D-Ppy/PB/CCE),采用循环伏安法和计时安培法研究了修饰电极对过氧化氢(H2O2)的电催化性能,并优化了制备修饰电极的实验条件.结果表明,第一层Ppy膜提高了PB在电极表面的分散性;第二层Ppy膜的存在极大地提高了修饰电极的化学及电化学稳定性.该修饰电极对H2O2的还原有良好的电催化活性,安培法检测H2O2的线性范围为2.0×10-6～2.5×10-3mol/L,检出限为6.5×10-7 mol/L,灵敏度为3 593.2μA/(mmol/L)cm2.

Abstract： A modified electrode based on double polypyrrole intercalative Prussian blue film was developed. The D-Ppy/PB complex was prepared via a three-step potential cycling meth- od with two Ppy films as the first and third layer and PB film in the middle, and was used to modify composite ceramic electrode （CCE）. The electrocatalytic performance of D-Ppy/PB/ CCE was investigated by cyclic voltammetry and chronoamperometry, and the experimental conditions for the preparation of D-Ppy/PB/CCE were optimized. The results showed that the first layer of Ppy film was convenient for the preparation of uniform PB with good adhe- sion. Additionally, the second layer of Ppy film was capable of improving the stability of the electrode. The D-Ppy/PB/CCE exhibited high electrocatalytic activity towards the reduction of H2O2 in the range of 2.0×10^-6 to 2.5 × 10^-3 mol/L with a detection limit of 6.5× 10^-7 mol/L, and the sensitivity was 3 593.2μA/ （mmol/L）cm^2.