【摘要】 在制得普鲁士蓝粉末的基础上,用固体石蜡作为粘合剂,将PB粉末和C粉按一定的比例进行充分混合制得掺杂PB的碳糊电极,研究了该修饰电极的制备、电化学性质及对AA的电催化作用,该修饰电极在以1.0 mol/L的氯化钾底液中,于0.2 V(vs.SCE)附近出现一对氧化还原峰, 扫速为30 mV/s时,峰电位差67 mV,重现性良好.表观电极反应速率常数Ka为18.84a-1.该修饰电极对AA的氧化具有良好的电催化作用.AA浓度在0.4×10-3-0.8×10-5mol/L范围内与峰电流呈良好的线性关系.该修饰电极克服了以往用电化学方法制作的PB膜修饰电极的稳定性差、寿命短等缺陷,在三周的实验中氧化还原电流不见降低,表现了较强的稳定性,且电极表面可进行更新.更多还原

【Abstract】 The PB-dopped carbon paste electrode was prepared by thoroughly mixing chemically synthesized prussian blue power,graphite and solid paraffin in an appropriate ratio. Its preparation,electrochemical properties and electrocatalysis effec on axcorbic acid(AA) were investigated. The PB-dopped carbon paste electrode was scanned in the 1. 0 mol/L KCl solution,a couple of redox peaks was observed around 0. 2 V(vs SCE). Peak potential separation was 67mV at a scan rate of 30 mV/s. The apparent electron transfes rate constant(ks)was 18. 94 s-1. The PB-dopped carbon paste electrode shows electro-catalytic activity for oxidation of AA. The peak currents were proportional to the concentrations of AA in the rang of 0. 4×10-3-0. 8×10-5 mol/L. This The PB-dopped carbon paste electrode shows a good stability.更多还原