作　　者： ; ; ; ; ;

机构地区： 华南农业大学理学院应用化学系

出　　处： 《分析测试学报》 2008年第7期734-738,共5页

摘　　要： 采用恒电位法在磷酸盐缓冲溶液中成功制备了聚邻苯二胺修饰玻碳电极,该修饰电极对H2O2有显著的电催化还原特性。用扫描电镜表征了聚邻苯二胺膜的形态结构,考察了影响膜修饰电极电催化还原特性的因素,发现在弱酸条件下制备的膜电极才对H2O2电还原有较高的催化活性。最佳制备条件：成膜电位0.75 V,成膜时间50min,成膜液中单体最佳浓度大于6.0 mmol·L^-1。低扫描速率下,膜电极反应受吸附控制,表现出薄层电化学的特性;高扫描速率下,电极反应受扩散控制。对H2O2响应的线性回归方程：在5.88×10^-2-23.5 mmol·L^-1,ΔIp（μA）=0.435＋0.494cH2O2（mmol·L^-1）（r=0.997 5,n=18）;在25.3-48.4 mmol·L^-1,ΔIp（μA）=9.36＋0.894cH2O2（mmol·L^-1）（r=0.999 4,n=15）。 Poly-o-phenylenediamine modified glassy carbon electrode was successfully prepared by potentiostatic technique in phosphate buffer solution.It was found that the electrode had a significant electrocatalytic activity toward the reduction of H2O2.The poly-o-phenylenediamine membrane morphology was characterized using scanning electron microscopy.Various preparing conditions affecting the electrocatalytic activity of the membrane electrode were investigated and found that the membrane electrode prepared only in weak acidic conditions had higher electrocatalytic activity.The optimal film-forming potential,time and monomer concentration were 0.75 V,50 min,more than 6.0 mmol·L^-1respectively.The reaction on membrane electrode was controlled by adsorption at low scanning rate,demonstrating the electrochemical characteristics of thin-layers,and controlled by diffusion at high potential scanning rate,respectively.The linear regression equations toward the response to H2O2 were ΔIp（μA）=0.435＋0.494cH2O2（mmol·L^-1（r=0.997 5,n=18） and ΔIp（μA）=9.36＋0.894cH2O2（mmol·L^-1 （r=0.999 4,n=15） in 5.88×10^-2-23.5 mmol·L^-1and 25.3-48.4 mmol·L^-1 respectively.

关 键 词： 聚邻苯二胺 玻碳电极 恒电位 电催化 过氧化氢

领　　域： [理学] [理学] [化学工程]