【摘要】 通过循环伏安法(CV)在玻碳(GC)电极表面电沉积出分布较为均匀的纳米Fe粒子,制得纳米Fe粒子修饰的GC(纳米Fe/GC)电极,再经"电荷置换"制得具有Fe核Pt壳结构的纳米粒子修饰的(纳米PtFe/GC)电极。SEM结果显示,纳米Fe/GC和纳米PtFe/GC表面粒子的形貌均呈立方体形,分布较为均匀,粒径在60nm左右。纳米PtFe/GC电极对亚硝酸盐的还原具有很高的电催化活性。3种电极的电催化活性顺序依次为:纳米Fe/GC<纳米Pt/GC<纳米PtFe/GC。相对于纳米Pt/GC电极,纳米PtFe/GC电极的起始还原电位(Ei)正移了0.14V,还原峰电流(ip)增大了3倍。更多还原

【Abstract】 Iron nanoparticles were uniformly deposited on glassy carbon electrode by electrochemical cyclic voltammetry,and Fe core/Pt shell nanoparticles(nano-PtFe) were further obtained through "galvanic replacement".SEM observation illustrated that cuboid nanoparticles with average sizes,ca.60 nm,dispersing uniformly on GC electrode surfaces.The electrocatalytical activities for nitrite reduction by nano-Fe/GC,nano-Pt/GC and nano-PtFe/GC electrodes were studied by cyclic voltammetry(CV).The catalytic activity is in the order of:nano-Fe/GC < nano-Pt/GC < nano-PtFe/GC.The onset potential(Ei) of nitrite reduction on nano-PtFe/GC electrode is positively shifted 0.14V,and the steady reduction current density(ip) is about 3 times of that from nano-Pt/GC electrode.更多还原