Fe-N共掺杂的碳纳米管串联空心球对氧还原反应的电催化  

Fe-N Doped Hollow Carbon Nanospheres Linked by Carbon Nanotubes for Oxygen Reduction Reaction

作　　者：张雅琳 陈驰 邹亮亮[1] 邹志青[1] 杨辉[1] ZHANG Ya-lin;CHEN Chi;ZOU Liang-liang;ZOU Zhi-qing;YANG Hui(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院大学,北京100049

出　　处：《电化学》2018年第6期726-732,共7页Journal of Electrochemistry

基　　金：国家重点研发计划(No.2017YFA0206500);国家自然科学基金(No.21673275;No.21533005;No.21802161)资助

摘　　要：以ZIF-8为模板,通过表面包覆聚多巴胺、同时刻蚀ZIF-8中的Zn2+,形成空心球,在与三氯化铁络合后,经高温碳化和氨气热处理,得到了高比表面积的Fe-N共掺杂的碳纳米管串联的碳纳米空心球催化剂.氨气不仅刻蚀碳基底提高比表面积,还可还原铁元素形成Fe4N纳米粒子,提升了催化剂对氧还原反应的电催化活性,其氧还原半波电位达0.79 V,仅比商业Pt/C低60 mV,而且其稳定性和耐甲醇性更优于商业Pt/C,展示出良好的燃料电池应用潜力.The development of non-precious metal catalysts for oxygen reduction reaction(ORR) is essential for large-scale application of proton exchange membrane fuel cells.Herein,we present the in situ formed Fe-N doped hollow carbon nanospheres linked by carbon nanotubes composite,synthesized by using ZIF-8 as sacrificed template to form polydopamine(PDA) hollow nanospheres,followed by complexing with FeCl3,high temperature heat-treatment and NH3-etching.ZIF-8 was gradually decomposed simultaneously with PDA coating due to the loss of Zn2+ grabbed by PDA.NH3 etching resulted in the improved surface area,while the reducibility of NH3 resulted in the formation of Fe4N nanoparticles,which benefits the ORR activity of the catalyst.The half-wave potential of the as-prepared of PDA-Fe/N/C-NH3 was 0.79 V,only 60 m V lower than that of commercial Pt/C.The stability and methanol tolerance of PDA-Fe/N/C-NH3 were even superior to that of commercial Pt/C,indicating the good potential of PDA-Fe/N/C-NH3 for the application of fuel cells.

关 键 词：非贵金属催化剂 氧还原反应 聚多巴胺 氨气刻蚀 碳纳米管/空心球复合物 

分 类 号：O646[理学—物理化学]