【摘要】 研究了聚色氨酸修饰玻碳电极（Ｐｏｌｙ－Ｔｒｙ／ＧＣ）的制备，用循环伏安法探讨了膜的电化学性质。在ｐＨ＝６．６的ＰＢＳ中，膜的循环伏安图上有两对氧化还原峰。掺杂金属离子Ｎｉ（Ⅱ）后的该聚合物膜修饰电极（Ｐｏｌｙ－Ｎｉ（Ⅱ） Ｔｒｙ／ＧＣ）对甲醇的催化活性大大提高，在０．０１ ｍｏｌ／Ｌ ＮａＯＨ中甲醇的氧化峰电位在０．６５ Ｖ，而同样条件下在空白玻璃电极（ＧＣ）和Ｐｏｌｙ－Ｔｒｙ／ＧＣ上甲醇的氧化峰电位要正得多。在０．１５ ｍｏｌ／Ｌ甲醇溶液中循环伏安扫描１５０ ｍｉｎ后，峰电流密度由１０６０ μＡ／ｃｍ～２降低至８８５μＡ／ｃｍ～２，然后峰电流密度不再降低，说明在电催化氧化甲醇过程中电极稳定性良好。更多还原

【Abstract】 A polymer film of tryptophan was obtained at a glassy carbon electrode (GC) by cyclic voltammetry. The cyclic voltammograms of the polymer film electrode(poly-Try GC) exhibited two redox waves. After incorporation of Ni(Ⅱ), the electrode (poly-Ni(Ⅱ) Try/GC) was greatly improved in catalytic activity. The potential 0.65 V of methanol oxidation at the poly-Ni(Ⅱ)Try/GC is much more negative than the potential at the poly-Try/GC and at the bare glassy carbon (GC) electrode in 0.01 mol/L NaOH. More importantly, the stability of poly-Ni(Ⅱ)Try/GC in oxidation of methanol was excellent. In methanol solution of 0.15 mol/L concentration the anodic peak current density decreased from 1 060 μA/cm~2 to 885 μA/cm~2 after cyclic voltammetric scanning for 150 min and the current was stable at last.更多还原