在玻碳电极上采用吸附法制备了四溴代酞菁钴(CoPcBr_4)、酞菁钴(CoPc)和四-α-(2,2,4-三甲基-3-戊氧基)酞菁钴(CoPc(OC_8H_(17))_4)修饰电极. 利用循环伏安法和线性扫描伏安法研究了修饰电极在酸性介质中对分子氧的电催化还原,比较了不同取代基的酞菁钴对电催化性质的影响. 结果表明,它们对分子氧还原均具有良好的电催化活性,其中酞菁钴和四-α-(2,2,4-三甲基-3-戊氧基)酞菁钴对O_2的催化是2电子还原生成H_2O_2,与裸电极相比,O_2的还原峰电位分别向正方向移动了0.33和0.48 V. 而四溴代酞菁钴修饰电极在-0.1和-0.7 V附近产生的2个还原峰,说明它催化O_2到H_2O_2的还原以后还可以促进H_2O_2继续还原到H_2O,最终实现O_2的4电子还原.
Tetrabromophthalocyanine cobalt(CoPcBr_4), phthalocyanine cobalt(CoPc) and tetra-α-(2,2,4-trimethyl-3-pentyloxy)phthalocyanine cobalt(CoPc(OC_8H_(17))_4) modified electrodes were prepared on glassy carbon(GC) electrodes by the adsorption method. Electrocatalytic reduction of molecular oxygen by the modified electrodes was studied in acidic media by means of cyclic voltammetry and linear sweep volammetry. The effects of phthalocyanine cobalt with different substituted groups on electrocatalytic property were compared. The results indicate that they had good electrocatalytic activity for molecular oxygen reduction. CoPc and CoPc(OC_8H_(17))_4 could catalyze O_2 to give H_2O_2 via two-electron transfer and the reduction peak potentials of O_2 positively shifted by 0.33 V and 0.48 V respectively compared with the bare GC electrode. There are two reduction peaks at about -0.1 V and -0.7 V in the voltammogram obtained at CoPcBr_4 modified electrode, indicating that it catalyzed the reduction of O_2 to H_2O_2 and then sequentially reduced H_2O_2 to H_2O. Finally, it completed the four-electron reduction of O_2.
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