【摘要】 采用循环伏安法成功制备了铁氰化锰 (MnHCF)膜修饰玻碳 (GC)电极。探讨了影响膜电沉积的各种因素 ,通过扫描电位范围对膜电沉积的影响 ,确定MnHCF膜的组成为Mn3 + Fe3 + (CN) 6[普鲁士黄类似物Fe3 + Fe3 + (CN) 6]。首次发现在整个膜电沉积过程中存在 3个阶段 ,最后阶段对制备均匀、致密的MnHCF/GC电极至关重要。阴离子的种类对MnHCF/GC电极的伏安特性及电催化活性有显著的影响 ,只有当支持电解质中含有HPO2 -4离子时 ,MnHCF膜修饰电极对H2 O2 的电氧化才表现出良好的电催化作用。在 0 .10mol/LNa2 HPO4溶液中 ,催化电流Δipa与过氧化氢浓度 (CH2 O2 )的线性关系为 :Δipa(μA) =2 .84 32 +2 .2 2 89× 10 4CH2 O2 (mol/L) (R =0 .994 4 ,n =9) ;线性范围为 1.4× 10 -5～ 1.8× 10 -3 mol/L ;检出限为 3.6× 10 -6mol/L (S/k =3)。更多还原

【Abstract】 The manganese hexacyanoferrate （MnHCF） film modified glassy carbon （GC） electrode was successfully prepared by cyclic voltammetry. Various factors affecting the electro-deposition of film were discussed and the stoichiometric composition of MnHCF film was ascertained to be Mn 3+ Fe 3+ （CN）₆ （Prussian yellow analogue Fe 3+ Fe 3+ （CN）₆） by studying the effect of potential scan range on the electro-deposition of film. There exist three clear-cut stages during the whole process of electro-deposition of film,which was first found,and the last stage was dispensable to the fabrication of homogenized,close MnHCF/GC electrode. The voltammetric characteristics and electrocatalytic activity of MnHCF/GC electrode were greatly influenced by the kinds of anions and it presented high electrocatalytic activity toward the oxidation of H₂O₂ only in the supporting electrolyte containing HPO 2- ₄ ions. In 0.10 mol/L Na₂HPO₄ solution,the linear relationship between the catalytic current （Δ i pa ） and the concentration of H₂O₂ （ C H₂O₂ ） is Δ i pa （μA） = 2.8432 + 2.2289×10 4 C H₂O₂ （mol/L） （ R=0.9944,n =9） in the range of 1.4×10 -5 ～1.8×10 -3 mol/L,and the detection limit is 3.6×10 -6 mol/L （ S/k =3）.更多还原