碳纳米管的氧化切割、掺杂改性及氧催化性能研究

Chemical Cutting,Heteroatom Doping and Oxygen Reduction Reaction Performance of Carbon Nanotubes

碳纳米管作为一种新兴的碳材料,因其优异的电化学特性在储能、电催化等领域备受关注.以碳纳米管为初始碳源,通过不同的氧化工艺分别得到氧化两端开口碳管(O-E-CNTs)和氧化超短碳管(SSCNTs),然后将上述两种氧化型碳管用作前驱体,分别经掺氮得到掺氮两端开口碳管(N-O-E-CNTs)和掺氮超短碳管(N-SSCNTs).结果发现N-SSCNTs具有更丰富的边缘缺陷结构,有利于活性位点的暴露,进而表现出氧还原催化性能的提升.此外,向N-SSCNTs中引入铁源,得到铁氮共掺杂超短碳管(Fe-N-SSCNTs).经测试发现,相较于N-SSCNTs,Fe-N-SSCNTs具有更加优异的氧还原性能,这主要是由于其丰富的缺陷结构和铁氮共掺杂共同作用所致.

Carbon nanotubes as a new kind of carbon materials,have attracted much attention in the field of energy storage and electrocatalysis.In this paper,we used pristine carbon nanotubes as initial carbon source,and prepared oxidized open-ended carbon nanotubes(O-E-CNTs)and oxidized super-short carbon nanotubes(SSCNTs)by different oxidation crafts.Then these two oxidized carbon nanotubes were adopted as carbon precursors to undergo subsequent N doping to obtain N-doped open-ended carbon nanotubes(N-O-E-CNTs)and N-doped super-short carbon nanotubes(N-SSCNTs),respectively.The results show that N-SSCNTs has much more structural defects,which is beneficial to the exposure of catalytic active sites,thus improving the oxygen reduction reaction(ORR)performance.Besides,Fe source was also introduced into N-SSCNTs,and Fe,N-co-doped super-short carbon nanotubes(Fe-N-SSCNTs)was synthesized.Compared to N-SSCNTs,it is found that the obtained Fe-N-SSCNTs exhibited much better ORR performance,which is due to the co-effect of enriched structural defects and Fe,N co-doping.