摘要
Fe3+可与电沉积在玻碳电极表面的对氨基苯磺酸发生静电吸附作用并与[Fe(CN)6]4-形成普鲁士蓝(PB),进一步交替重复吸附Fe3+和[Fe(CN)6]4-反应,形成PB晶体。该晶体对还原过氧化氢(H2O2)具有很高的电化学活性。通过循环伏安法、交流阻抗法和计时电流法对传感器进行了电化学表征。研究了该传感器对H2O2的电催化作用,探讨了工作电位、pH值及干扰物质对响应电流的影响。结果表明,在磷酸盐缓冲溶液中(pH=5.4,0.1 mol/L),响应电流与H2O2的浓度在0.97～32.33 mmol/L范围内具有良好的线性关系,相关系数为0.999 3,传感器的响应时间小于5 s,检测限为0.48 mmol/L(S/N为3)。
Para aminobenzene sulfonic acid（p-ABSA） was deposited onto the surface of a glass carbon electrode（GCE） through the electrochemical deposition.Cation-exchange properties of the deposited p-ABSA were then employed to confine ferric ion（Fe3＋） within the polymeric layer.Ferrocyanide ions（[Fe（CN）6]4-） can react with the adsorbed Fe3＋ forming Prussian blue（PB）.PB crystals were formed by alternative adsorption of Fe3＋ and reaction with [Fe（CN）6]4-.The crystal shows high catalytic activity toward the electrochemical reduction of hydrogen peroxide.Cyclic voltammetry,electrochemical impedance spectroscopy and typical amperometric response method were employed to characterize the electrochemical properties of the PB modified electrode.The experimental parameters（applied potential,pH,and interfering substances） influencing the performance of the PB modified electrode were investigated in details.Under optimal conditions,the PB modified electrode exhibits a wider linear range of 0.97~32.33 mmol/L with the fast response less than 5 s and a low detection limit of 0.48 mmol/L（S/N=3）.
出处
《应用化学》
CAS
CSCD
北大核心
2012年第5期585-590,共6页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20805011
20905021)资助项目
