Pd-Fe／C催化剂中Fe的状态对氧还原电催化活性的影响  

Effect of Fe State on Electrocatalytic Activity of Pd-Fe/C Catalyst for Oxygen Reduction

作　　者：曹爽[1] 王彦恩[2] 陆天虹[1,3] 刘长鹏[3] 邢巍[3] 唐亚文[1] 

机构地区：[1]南京师范大学化学与环境科学学院,南京210097 [2]河北农业大学理学院,保定 [3]中国科学院长春应用化学研究所,长春

出　　处：《应用化学》2009年第5期613-615,共3页Chinese Journal of Applied Chemistry

基　　金：科技部“八六三”计划项目(2006AA05Z137,2007AA05Z143,2007AA05Z159);国家自然科学基金(20573057,20703043);江苏省自然科学基金(BK2006224)资助项目

摘　　要：在室温下,在水和四氢呋喃两元体系中制备了炭载双金属Pd-Fe(Pd-Fe/C)催化剂。研究表明,在Pd-Fe/C催化剂中,Fe以合金化形态及未合金化的无定形形态存在。经过酸处理后,未合金化的无定形形态的Fe溶解,而与Pd形成合金化的Fe不溶于酸。电化学研究发现,经酸处理后的Pd-Fe/C催化剂对氧还原有较高的电催化活性,而对甲醇氧化没有电催化活性。结果表明,与Pd形成合金的Fe能很好的提高Pd对氧还原的电催化活性。而没有合金化的Fe基本上没有这种作用,酸处理后的Pd-Fe/C催化剂是一种很好DMFC的阴极催化剂。In the study of direct methanol fuel cell （DMFC）, issues on catalysts with high electrocatalytic performance for oxygen reduction and without electrocatalytic performance for methanol oxidation ars important. In this work, the carbon supported Pd-Fe（Pd-Fe/C） catalyst was prepared in a mixed solution of water and tetrahydrofuran. It was found that in the Pd-Fe/C catalyst, Fe existed as the alloying state and amorphous non-alloying state. The amorphous non-alloying Fe can dissolve in the acid, while the alloying Fe cannot dissolve after acid treatment. In addition, electrochemical study indicates that the Pd-Fe/C catalyst treated with acid possesses the high electrocatalytic activity for oxygen reduction and has no electrocatalytic activity for methanol oxidation. These results indicate that the alloying Fe could effectively increase the electrocatalytic activity of Pd for oxygen reduction, while non-alloying Fe has no such function. Pd-Fe/C catalyst treated with acid is therefore an excellent cathodic catalyst in DMFC.

关 键 词：直接甲醇燃料电池 Pd-Fe/C催化剂 氧还原 合金化 

分 类 号：O646[理学—物理化学]