金属卟啉负载炭黑电催化剂氧还原性能  

Heat-treated metalloporphyrin compounds supported on different carbons as electrocatalyst for oxygen reduction

作　　者：任奇志[1] 麻晓霞[1] 谢先宇[1] 阎陶[1] 马紫峰[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《化工学报》2006年第11期2597-2603,共7页CIESC Journal

基　　金：国家自然科学基金项目(20471037;50236010);上海市自然科学基金项目(03ZR14061);国家高技术研究发展计划项目(2002AA323040).~~

摘　　要：合成了四甲氧基苯基钴卟啉(CoTMPP)和四甲氧基苯基铁卟啉(FeTMPP)配合物,分别负载于经过双氧水和硝酸预处理且掺杂了MnOx的炭载体,用于质子交换膜燃料电池阴极氧还原反应电催化剂.讨论了不同中心金属离子、不同载体、不同预处理方法和不同焙烧温度对催化剂催化活性的影响.通过旋转圆盘电极技术(RDE)和紫外可见光谱(UV-vis)测试,利用循环伏安曲线(CV)和Koutevky-Levich关系式评价了电催化剂对氧还原反应的电催化性能.研究表明,CoTMPP负载于双氧水处理过的炭载体BP2000上活性最好,焙烧的最佳温度是900℃,同时发现在载体中掺杂MnOx并没有达到预期效果.To obtain cathode electrocatalysts for the oxygen reduction in proton exchange membrane （PEM） fuel cell, iron and cobalt tetramethoxyphenylporphyrins adsorbed on pretreated carbons, including black pearls 2000 （BP） and Vulcan XC-72 （Vulcan） respectively by depositing MnOx were investigated in detail The effects of different central metal ions, carbon supports, pretreatment methods and various heat-treatment temperatures were compared. The catalysts were evaluated by RDE in 0.5 mol·L^-1 H2SO4. The best results were obtained for CoTMPP on BP pretreated by H2O2. The most active and stable catalysts were obtained by calcining at a high temperature （900℃）. After heat treatment at 900℃, Co N4 bond structure in CoTMPP catalyst was no longer detected which meant that the central structure of the catalyst was changed during heat-treatment. Trying to deposit MnOx in carbons did not achieve the expected result in acid medium.

关 键 词：质子交换膜燃料电池 金属卟啉 电催化剂 氧还原 炭载体 循环伏安 

分 类 号：O614[理学—无机化学]