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电化学  2013 

Keggin型钴取代杂多阴离子PW11O39Co(II)(H2O)5-的电催化性能

, PP. 488-492

Keywords: Keggin型钴取代杂多阴离子,过氧化氢,甲醇,电催化氧化

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Abstract:

本文用循环伏安、交流阻抗等电化学方法研究了Keggin型钴取代杂多阴离子PW11O39Co(II)(H2O)5-(PW11Co)的电化学性质及其对H2O2和甲醇阳极氧化的电催化作用,提出了PW11Co作为阳极媒质可能的电催化机理.结果表明,PW11Co除了2对可逆的W—O骨架峰之外,在1.367V/1.266V处还有1对准可逆的Co峰,对应于Co(II)/Co(III)电对的氧化还原响应.该电极过程有质子参与,其交换电流密度i0为5.7×10-6A·cm-2.在酸性条件下(pH2.5),PW11Co对H2O2的阳极氧化具有明显的电催化活性,耦合甲醇的氧化可使甲醇的氧化速率显著提高.

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