钯修饰电极的制备及其对H2O2的电催化还原作用研究

摘要

[Objective] To study the clectrocatalysis for H2O2 using Pd chemically modified electrode. [Method] A new type of Pd modified composite ceramic carbon electrode (Pd/CCE) was fabricated by using cyclic voltammetry and its electrocatalytic reduction of H2O2 was investigated- [Result] The modified electrode had excellent electrocatalytic activity towards the reduction of H2O2 containing PdCl2·2H2O with the pH of 1.2 by controlling the scanning potential at 0 - 1.0 V(vs. SCE) and scanning for 40 circles. Under the optimum conditions, the catalytic current had relationship with concentration of H2O3 over the range of 6.0 ×10-5 mol/L to 1.0×10-2 mol/L with the detection limit of 2.2 ×10-5 mol/L (3Sb). [Conclusion] The Pd/CCE obtained by electrodeposition could determine H2O2 under lower working potential. Additionally,it had many advantages including simplicity and convenience of preparation,cheapness of raw materials,short response lime and convenience of surface renewal.%[目的]研究钯化学修饰电极在H2O2检测中的应用.[方法]采用循环伏安法制备了钯修饰的复合陶瓷碳电极( Pd/CCE),研究了该修饰电极对H2O2的电催化性能.[结果]在含有PdCl2·2H2O的H2SO4溶液中(pH 1.2),控制扫描电位范围为0～1.0V(vs.SCE)连续扫描40圈时制得的Pd/CCE修饰电极对H2O2具有较强的电催化活性,安培法检测H2O2的线性范围为6.0×10-5～ 1.0×10-2mol/L,检出限为2.2 ×10-5mol/L( 3Sb).[结论]直接电沉积得到的钯修饰电极,可实现较低电位下测定H2O2,且电极具有制作简单、价格低廉、响应时间短和表面容易更新等特点.