氮掺杂炭层包覆碳纳米管的组织结构调控及其氧还原催化活性
发布时间：2018-07-24 19:37
【摘要】：采用化学原位聚合合成聚吡咯涂覆碳纳米管,之后将其在氮气氛下热处理制备氮掺杂炭层包覆碳纳米管NCCNTs。利用该工艺,通过改变热处理温度,调控NC-CNTs组织结构和表面化学组成。比表面和孔结构分析显示,600,800和1 000℃热处理制备的氮掺杂碳纳米管NC-CNT600,NC-CNT800和NC-CNT1000的比表面积和孔体积依次显著增加,NC-CNT1000的比表面积和孔体积分别约是NC-CNT600的3倍和1.7倍。这是因碳纳米管表面聚吡咯层向氮掺杂炭层转化过程导致更多的微孔形成。然而,制备温度升高使NC-CNTs的氮含量降低,表面含氮官能团由吡咯型氮向吡啶型氮和石墨氮转化,NC-CNT1000含最高比例的石墨氮。作为无金属催化剂,NC-CNTs在碱性电解质条件下展现了明显的氧还原催化活性,但其氧还原活性并不与样品氮含量成正比。NC-CNT600和NC-CNT800的氧还原反应为两电子转移机制,而NCCNT1000表现为两电子和四电子转移混合机制,其展现出最高的氧还原催化活性和催化稳定性,这可能是其具有高的比表面积和孔体积,结合含氮官能团中高比例石墨氮的缘故。
[Abstract]:Polypyrrole coated carbon nanotubes (CNTs) were synthesized by chemical in-situ polymerization and then treated in nitrogen atmosphere to prepare N-doped carbon coated carbon nanotubes (NCCNTs). The microstructure and surface chemical composition of NC-CNTs were regulated by changing the heat treatment temperature. The specific surface area and pore volume of NC-CNT600 and NC-CNT600 NC-CNT800 and NC-CNT1000 prepared by heat treatment at 1 000 鈩，
本文编号：2142443
[Abstract]:Polypyrrole coated carbon nanotubes (CNTs) were synthesized by chemical in-situ polymerization and then treated in nitrogen atmosphere to prepare N-doped carbon coated carbon nanotubes (NCCNTs). The microstructure and surface chemical composition of NC-CNTs were regulated by changing the heat treatment temperature. The specific surface area and pore volume of NC-CNT600 and NC-CNT600 NC-CNT800 and NC-CNT1000 prepared by heat treatment at 1 000 鈩，
本文编号：2142443
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