Preparation and Electrocatalytic Performance of Nanometer Cobalt Tetroxide Catalysts
As an important electrode catalytic material,cobalt tetroxide(Co3O4)has the characteristics of high catalytic activity,good stability and low price,which can be expected to solve the problems of over-dependence on the precious metal catalysts of Pt series with low reserves and high cost.In the experiments,the chemical precipitation method combined with thermal decomposition method were used to prepare bulk,spherical and rod-shaped nano Co3O4,and the minimum particle size of the spherical was 8.54 nm.Then the homogeneous and high-purity Co3O4 was prepared as the cathode catalyst of direct methanol fuel cell to test the electrocatalytic activity.The results showed that Co3O4 had good electrocatalytic performance.The ORR peak potential of lmol/L KOH was 1.34 V,which was 0.05 V higher than that of commercial Pt/C(20(wt)％).After adding 2％of anhydric methanol to the oxygen-saturated 1 mol/L KOH dielectric solution,the current density of the two materials decayed to 0.0051 mA/cm2 and 0.0136 mA/cm2 after 250 s,and the half-wave potential was 1.025 V and 1.113 V,respectively.Although the catalytic activity of Co3O4 was not as good as that of Pt/C(20(wt)％)material,the tolerance and stability of Co3O4 to methanol were better than that of commercial Pt/C(20(wt)％)material.
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