Chinese Journal of Applied Chemistry ›› 2009, Vol. 26 ›› Issue (12): 1471-1475.

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Electrocatalytical of Reduction of Oxygen at Cobalt Phthalocyanine and Its Derivative Modified Electrodes

LI Ya-Nan1,2, HE Li-Hua1*, ZUO Xia1, GAO Shan1, ZHAO Hui1, JIANG Zhou3, CHEN Nai-Sheng3, HUANG Jin-Ling3   

  1. (1.Laboratory of Functional Materials,School of Chemistry and Materials Science,
    Heilongjiang University,Harbin 150080;
    2.Department of Food and Environmental  Engineering,Heilongjiang Oriental College,Harbin;
    3.Institute of Functional Materials,School of Chemistry and Chemical Engineering,Fuzhou University,Fuzhou)
  • Received:2009-01-15 Revised:2009-04-27 Published:2009-12-10 Online:2009-12-10
  • Contact: HUO Li-hua

Abstract:

Tetrabromophthalocyanine cobalt (CoPcBr4), phthalocyanine cobalt (CoPc) and tetra-α-(2,2,4-trimethyl-3-pentyloxy)phthalocyanine cobalt (CoPc(OC8H17)4) modified electrodes were prepared on glass 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 voltammetry. The effects of phthalocyanine cobalt with different substituted groups on electrocatalytic property were compared. The results indicate that they have good electrocatalytic activity for molecular oxygen reduction. CoPc and CoPc(OC8H17)4 could catalyze O2 to give H2O2 via two-electron transfer and the reduction peak potentials of O2 positively shifted 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 CoPcBr4 modified electrode, indicating that it catalyzed the reduction of O2 to H2O2 and then sequentially reduced H2O2 to H2O. Finally, it completed the four-electron reduction of O2.

Key words: metellophthalocyanines, oxygen reduction, electrocatalysis

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