以氧化石墨烯为结构诱导试剂,以葡萄糖酸锌为碳源,尿素为氮源制备二维氮掺杂多孔碳。氧化石墨烯可以诱导二维结构的形成,并且高温炭化得到的石墨烯可有效地改善多孔碳材料的电子传输能力,葡萄糖酸锌中的锌离子可在高温下挥发继而作为造孔剂改善多孔碳的孔道结构,而尿素引入的氮原子可以提供赝电容改善电化学性能。通过尿素用量以及炭化温度的调控,优化二维氮掺杂多孔碳的制备条件,以其作为电极材料应用于超级电容器中,展现了优异的性能。结果表明:在0.1A/g的电流密度下,二维氮掺杂多孔碳电极展现了176.8F/g的容量,在10A/g下依旧可以保持71.9%的倍率。以二维氮掺杂多孔碳为电极制备的对称电容器在5A/g的电流密度下循环10000次后依然可以保持初始容量的80.4%,展现了优异的循环稳定性。
Two-dimensional nitrogen-doped porous carbon was prepared by using graphene oxide as structure induction reagent,zinc gluconate as carbon source and urea as nitrogen source.Graphene oxide could induce the formation of two-dimensional structure and the presence of graphene could enhance the conductivity.Zinc ions in zinc gluconate could be used as pore-forming agent to improve the pore structure of carbon materials,and nitrogen atoms introduced by urea could provide pseudocapacitance to improve the electrochemical performance.The optimized two-dimensional nitrogen-doped porous carbon was obtained by controlling the amount of urea and the carbonization temperature,and it presented excellent performance as the electrode material in the supercapacitor.It exhibited a capacity of 176.8F/g at the current density of 0.1A/g,and still maintained a high rate of 71.9% at 10A/g.The symmetric capacitor prepared with two-dimensional nitrogen doped porous carbon kept 80.4% of the initial capacity after 10000 cycles at 5A/g,showing excellent cycling stability.
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基金资助
辽宁省化学助剂合成与分离省重点实验室开放课题基金资助项目(ZJKF2010);盘锦市自然科学基金指导性计划项目(202101020)
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