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《Chinese Journal of Catalysis》 2006-11
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Electrocatalytic Reduction of Oxygen at Pyrolytic Graphite Electrode Modified with Novel Copper(Ⅱ) Complex

WANG Mingyan~ 1* , XU Xingyou~1, GAO Jian~1, JIA Nengqin~2(1 Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, Jiangsu, China; 2 Department of Chemistry, Shanghai Normal University, Shanghai 200234, China)  
A novel five-coordinated copper(Ⅱ) complex (Cu[L(ImH)](ClO_4)_2), which was self-assembled with imidazole, Cu~ 2+ center, and 2-[bis(2-aminoethyl)amino]ethanol (L), was synthesized. The ligand L bearing an O atom at the hydroxyethyl arm with proper flexibility provided enough variability to adapt the different configuration requirement of Cu~ 2+ /Cu~+ in the redox process. The pyrolytic graphite (PG) electrode modified with the Cu[L(ImH)](ClO_4)_2 complex was constructed. The electrochemical behavior and electrocatalytic activity of the Cu[L(ImH)]/PG electrode for oxygen reduction were studied by cyclic voltammetry and chronoamperometry. The Cu[L(ImH)]/PG electrode exhibited high electrocatalytic activity and stability for oxygen reduction. The reduction current increased with the increase in scan rate, and the plot of I_p to v~ 1/2 was linear. According to the results of potential step chronoamperometry, the electrocatalytic mechanism of oxygen reduction at the modified electrode might be similar to the ECE (E: electrode reaction, C: chemical reaction) process, the number of electron transfer in the reduction process was about 4, and the oxygen was finally reduced to H_2O at the modified electrode.
【Fund】: 江苏省自然科学基金(BK2005045);; 淮海工学院校内课题(Z2005012)资助项目.
【CateGory Index】: O646.54
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