摘要
采用简易溶剂热法成功制备出了氮掺杂石墨烯(N-GNSs),结构表征显示其形貌良好。X射线光电子能谱(XPS)结果表明在溶剂热过程中,氧化石墨烯表面的大部分含氧功能团已被成功除去,而且二甲基甲酰胺中的氮原子通过吡咯氮和石墨氮的形式成功掺杂到石墨烯结构中。作为电极活性材料,N-GNSs展现出优异的电容特性,在2 mol/LKOH电解液中电流密度为0.5 A/g时比电容可达181.3 F/g。此外,N-GNSs还展示出良好的循环稳定性,2000次连续循环后容量仍保持为初始数值的92.5%。因此,氮掺杂石墨烯是一种潜在的超级电容器电极材料。
Nitrogen-doped graphene nanosheets （N-GNSs） with good morphologies were successfully synthesized by a facile solvothermal method. The result of X-ray photoelectron spectroscope （XPS） revealed that most oxygen containing functional groups on the surface of graphene oxide （GO） were removed during solvothermal reduction, and nitrogen atoms from dimethylformamide （DMF） were effectively doped into graphene structure in the form of pyrrolic-N and graphite-N. As an electro-active material, the N-GNSs exhibited superior capacitive behavior in 2 mol/L KOH electrolyte with a high specific capacitance of 181.3 F/g at the current density of 0.5 A/g. Also, it displayed good electrochemical stability with 92.5% of the initial capacitance over consecutive 2000 cycles. Therefore, the N-GNSs can be an attractive candidate as electrode materials for supercapacitors.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期677-682,共6页
Journal of Inorganic Materials
基金
The Top Hundred Talents Program of the Chinese Academy of Sciences
National Natural Science Foundations of China 51005225,21203223)
关键词
石墨烯
氮摻杂
溶剂热
超级电容器
graphene
nitrogen-doped
solvothermal
supercapacitors
