水溶液中羧基酞菁钴（Ⅱ）／铁（Ⅲ）低聚物对氧还原的电催化作用

THE ELECTROBEPUCTION OF OXYGEN CATALYZED BY LOW-MOLECULARS OF COBALT AND IRON CARBOXYPHTHALOCYANINE IN AQUEOUS SOLUTION

用电化学和现场光谱电化学方法对羧基酞菁钴（Ⅱ）和羧基酞菁铁（Ⅲ）低聚物催化氧电还原的研究表明：水溶液中，羧基酞菁钴（Ⅱ）低聚物主要催化氧的二电子还原为Ｈ２Ｏ２的反应，而羧基酞菁铁（Ⅲ）低聚物则是氧四电子还原为Ｈ２Ｏ的活性催化剂．催化反应均属ＥＣ异相催化机理，氧电还原的活性中心分别是吸附在电极表面上配合物分子中Ｃｏ（Ⅱ）或Ｆｅ（Ⅲ）态中心离子．

The electroreduction of O2 was examined in aqueous solution containing low-molecular polymers of cobalt and iron octocarboxyphthalocyanine (CoOCPcand FeOCPc), respectively, with electrochemical and spectroelectrochemical methods. Both of the polymers showed pronounced catalytic effect on electroreduction of O2. CoOCPc predominantly promoted the O2 reduction through H2O2 formation and FeOCPc a 4-electron to water at a potential closely coincident with that of Co(Ⅱ )to Co(Ⅰ ) and Fe(Ⅲ ) to Fe(Ⅱ) reduction, respectively. The catalytic mechanism and the active centers were suggested.