应用于氧还原电极的新型Co-PAn-C复合催化材料  

Novel Composite Catalysts Co-PAn-C Applied to the Oxygen Reduction Electrode

作　　者：吕董[1] 周德璧[1] 胡建文[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《化学学报》2008年第4期403-407,共5页Acta Chimica Sinica

基　　金：湖南省自然科学基金(No.04JJ3082)资助项目.

摘　　要：借鉴美国LosAlamos国家实验室报告的应用于燃料电池氧电极的新型Co-PPy-C(PPy,polypyrrole)复合物催化材料,提出Co-PAn-C(PAn,polyaniline)复合材料可能对氧的电化学还原也具有催化活性,并首次制备出Co-PAn-C复合催化材料.发现Co-PAn-C对氧还原有显著的催化效果,碱性介质中氧气气氛下,电极电位为-0.2 V vs.Hg/HgO时电流密度达到128mA·cm-2,性能也比较稳定.初步研究了Co-PAn-C对ORR(oxygen reduction reaction)的催化机理,可能是在结构中形成了Co-N活性位置,影响了氧和反应中间产物在电极上的吸附和脱附过程.With reference to the United States Los Alamos National Laboratory＇s report about a new class of composite catalysts Co-PPy-C （PPy, polypyrrole） which were applied to the oxygen electrode of fuel cells, the Co-PAn-C （PAn, polyaniline） composite catalysts were boldly put forward and successfully prepared, which probably had the oxygen reduction activity. It was found that this composite had obvious catalytic performance, and reached the current density of 128 mA·cm^-2 at the potential -0.2 V （vs. Hg/HgO）, and its performance was relatively stable. The catalytic mechanism of ORR （oxygen reduction reaction） on Co-PAn-C was preliminarily studied. The probably existent Co-N sites in the structure influenced the adsorption and desorption processes of oxygen and the reaction intermediates.

关 键 词：燃料电池 氧还原 金属卟啉 电催化 

分 类 号：O643.36[理学—物理化学]