摘要
以氧化石墨烯为原料,尿素为掺氮剂,在120~220℃水热条件下,合成一系列不同含氮量的掺氮石墨烯。通过傅里叶红外光谱仪、X射线衍射仪、场发射扫描电镜、X射线光电子能谱仪和电化学测试仪等手段对样品的形貌结构及电性能进行研究。结果表明:在不同温度下,制备的掺氮石墨烯呈多孔网状结构,材料内部网孔的大小和数量随水热温度的升高而增加,并得到了不同含氮量的掺氮石墨烯。其中N元素以吡啶氮、吡咯氮和石墨氮3种形式存在并掺杂到石墨烯晶格中,温度升高,不利于吡咯氮的生成,吡啶氮和吡咯氮逐渐转化为更稳定的石墨氮。这种含氮基团键合类型随温度的变化过程表明,氮原子逐渐整合进入石墨烯晶格内部。在6mol/L KOH电解液中,180℃下水热反应得到的掺氮石墨烯在10mA/g电流密度下的比电容可达187.6F/g,性能最优。
With the oxidized graphite as raw material,urea as nitrogen,in 120~220℃ hydrothermal conditions,the nitrogen doped graphenes with different N content were synthesized.Fourier transform infrared spectroscopy（FT-IR）,X-ray diffraction（XRD）,field emission scanning electron microscope（FESEM）,X-ray energy spectrum（EDS）,X-ray photoelectron spectroscopy（XPS）and electrochemical test were used to study the morphology and electrical properties of samples.The results showed that：The size and amount of internal mesh of material increased with the increasing of hydrothermal temperature,and got the different doping content of graphene.Where N elements were doped into graphene lattice in three forms：＂pyridinic N＂,＂pyrrolic N＂and ＂graphitic N＂.The increasing of temperature was not conducive to the formation of pyrrole nitrogen,pyridine nitrogen and pyrrole nitrogen gradually transformed into more stable graphite nitrogen.The change of type of nitrogen-containing groups with temperature indicated that the nitrogen atoms were gradually integrated into the interior of graphene lattice.In the 6 mol/L KOH electrolyte,the specific capacitance of nitrogen-doped graphene obtained at 180℃ was up to 187.6 F/g at 10 mA/g current density.
作者
李子庆
赫文秀
张永强
于慧颖
李兴盛
刘斌
Li Ziqing;He Wenxiu;Zhang Yongqiang;Yu Huiying;Li Xingsheng;Liu Bin(School of Chemistry and Chemical Engineering,Inner Mongolia University of Science ＆Technology,Baotou 014010)
出处
《化工新型材料》
CAS
CSCD
北大核心
2018年第8期174-178,共5页
New Chemical Materials
基金
内蒙古自然科学基金(2014MS0523和2015MS0208)
内蒙古自治区高等学校青年科技英才计划-青年科技领军人才A类项目(NJYT-14-A08)
包头市科技计划项目(2015C2004-1和2016-4)
关键词
氧化石墨
氮掺杂
尿素
温度
比电容
graphite oxide
nitrogen doping
urea
temperature
specific capacitance
作者简介
李子庆（1992-），男，硕士研究生，主要从事石墨烯复合材料的研究。;联系人：赫文秀，女，博士，教授，主要从事镍氢电池复合材料的研究。
