双层聚吡咯/普鲁士蓝复合膜的制备与性能研究

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.

Preparation and properties of double Ppy/PB composite film

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 method 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 adhesion.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 3 593.2 μA/(mmol/L)cm2.