铁铂核壳纳米粒子修饰玻碳电极制备及对亚硝酸盐还原的电催化性能

Electrochemical Preparation of Fe Core/Pt Shell Nanoparticle Modified Glassy Carbon Electrode and Their Electrocatalytic Activities for Nitrite Reduction

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。

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.