旋转环盘电极研究氧在PolyCoPP膜上的电催化还原

Studies of Oxygen Reduction on Polycobaltprotoporphyrin Film with RRDE

用旋转环（Au）－盘（热解石墨，PG）电极研究了氧在聚钴原卟啉二甲酯膜（PolyCoPP）上的电催化还原．实验发现在0．1mol·L－1NaOH，O2饱和的溶液中，当盘电位在低极化区时，氧的还原主要是二电子还原过程，HO2－为主要产物，不会再进一步还原为OH－；而在高极化区时，氧既有四电子的直接还原，也有HO2－的进一步还原．

The mechanism of oxygen reduction on polycobaltprotoporphyrin IX dAnethyl ester (PolyCoPP) ffo has been studied by using the rotating ring(Au)-disk(pyrolytic graPhite, PG) electrode (RRDE) tecboque. The PolyCoPP/PG electrode promotes the oxygen reduction via two-electron process which produces peroalde as a main product in O2-saturated O.1 mol'dm-3 NaOH. Once HO2- has been formed, no further reduction to OH- takes place at the disk. When the disk potential shifts to more negative, either the direct reduction of O2 to OH- or the fUIther reduction of HO2- to OH- occurs.