铁/钴质量比对MWCNT-聚苯胺复合物氧还原电活性的影响  

Effect of Fe/Co mass ratio on activity of non-noble metal catalyst for oxygen reduction reaction

作　　者：张玉晖[1] 易清风[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《化工学报》2014年第6期2113-2119,共7页CIESC Journal

基　　金：国家自然科学基金项目(21376070;20876038);湖南省高校创新平台开放基金项目(11K023);湖南省自然科学基金项目(14JJ2096)~~

摘　　要：中心金属离子在非贵金属C-N复合物对氧还原反应(ORR)的电催化活性方面有重要作用。通过将含有多壁碳纳米管(MWCNTs)、聚苯胺与过渡金属Fe和Co的前驱体在N2气氛下于900℃下加热,得到了不同金属比例的C-N催化剂。采用SEM、XRD等对催化剂的结构进行了表征。利用电化学伏安技术,研究了催化剂对ORR的电催化活性及其稳定性。结果表明,当Fe与Co质量比为6:1时催化剂的催化活性最好,在酸性溶液中ORR起始电位达到0.52 V(vs SCE),电流密度为12.5 mA·mg-1@-0.3 V(vs SCE);在碱性溶液中ORR起始电位为-0.09 V(vs SCE),电流密度为7.8 mA·mg-1@-0.8 V(vs SCE)。结果表明,催化剂中Fe与Co的质量比对催化剂的活性有很大影响。Transition metal has an important effect on the electrocatalytic activity of non-noble metal catalysts for oxygen reduction reaction （ORR）. In this work, the precursor containing MWCNTs, polyaniline, Fe and Co was firstly synthesized, and then the precursor was heated at 900℃ under N2 to obtain the C-N catalysts with different Fe/Co mass ratios. The structure of the catalysts was investigated with SEM and X-ray diffraction. ORR activity of the catalysts in acidic and alkaline media was tested with voltammetry. The prepared catalyst with Fe/Co mass ratio of 6：1 presents the highest electrocatalytic activity for ORR. ORR current density at 2000 r·min-1 was 12.5 mA·mg-1@-0.3 V（vs SCE） in acidic solution and 7.8 mA·mg-1@-0.8 V（vs SCE） in alkaline solution, and onset potential of ORR was 0.52 V（vs SCE） in acidic solution and-0.09 V（vs SCE） in alkaline solution. Fe/Co mass ratio played a great role in the electrocatalytic activity of these non-noble metal catalysts for ORR.

关 键 词：电化学 燃料电池 催化 氧还原 非贵金属催化剂 

分 类 号：TQ152[化学工程—电化学工业]