【摘要】 以氯化1-丁基-3-甲基咪唑离子液体([BMIM][Cl])为溶液添加剂,通过电沉积方法制备了普鲁士蓝(Prussian blue,PB)修饰的碳糊电极(PB-IL/CPE);采用循环伏安法检测了不同[BMIM][Cl]浓度下制备的PB-IL/CPE的电化学性能和动力学特征。同时采用计时安培法检测了PB-IL/CPE对过氧化氢的催化性能。实验结果表明,离子液体的存在能够提高PB在电极表面的沉积电流,[BMIM][Cl]浓度为0.2 mmol/L时,PB的氧化还原电流最大;相对于在无[BMIM][Cl]存在下制备的PB修饰电极(PB/CPE),PB-IL/CPE对过氧化氢的催化效果更好,线性范围更宽,灵敏度更高;此外,PB-IL/CPE电极的动力学特征显示,K+在PB-IL/CPE表面的扩散速率明显提高,为4.45×10-11cm2·s-1。更多还原

【Abstract】 1-Butyl-3-methylimidazolium chloride( [BMIM][Cl]) ionic liquid was used as a novel electrolyte additive to prepare a prussian blue( PB) modified carbon paste electrode( PB- IL/CPE) by electrodeposition method. The electrochemical property and kinetic characteristics of PB- IL/CPE were studied by cyclic voltammetry. The electrocatalytic reduction behavior of H2O2 on PB- IL/CPE was detected by chronoamperometry. The results demonstrated that the depositing current of PB was related to the concentration of [BMIM][Cl],and the highest redox currents for PB electrodeposition were obtained at 0. 2 mmol/L [BMIM][Cl]. Compared to PB/CPE electrode prepared in absence of[BMIM][Cl],the PB- IL/CPE showed more powerful electrocatalytic reduction to H2O2,with wider linear detection range and higher sensitivity. In addition,the kinetics of PB- IL/CPE was also discussed. In comparison with that on PB/CPE,higher diffusion coefficient of K+( 4. 45 × 10- 11cm2·s- 1) on PB- IL/CPE was obtained.更多还原