利用聚对苯二甲酸乙二醇酯(PET)为碳源,磷酸为活性剂,采用高温法制备多孔碳(PC),并用不同浓度的硝酸对多孔碳进行氧化改性。用氮气(N2)吸附和傅里叶红外光谱对材料进行结构表征,以恒流充放电和循环伏安法研究所得材料的电容性能。实验结果表明:当PET与磷酸质量配合比为1:2,900℃炭化时,PC比表面积达1087.4m2/g,孔径3～6nm;经60%(wt,质量分数)硝酸改性后多孔碳(PC-0.60N)的比表面积为872.4m2/g。当扫描速度为5mV/s时,PC的比电容为188.7F/g,PC-0.60N的比电容达到365.3F/g,经过3000次循环,PC-0.60N的比电容量保持81.4%。
The porous carbon (PC) was prepared by using polyethylene terephthalate (PET) as the carbon source,and phosphoric acid as the activating agent.Then PC was modified by HNO3 solution with different concentration.The product was characterized by nitrogen adsorption-desorption and FT-IR.The electrochemical property was investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge.The results showed that when the mass ratio of PET and H3PO4 was 1:2,carbonized temperature was 900℃ in N2 atmosphere,the specific surface area of product was up to 1087.4m2/g with a pore size between 3～6nm.After surface oxidation by HNO3 solution with different concentration,the specific surface area of porous carbon was decreased from 1087.4m2/g to 872.4m2/g which was oxidated by 60%(wt)HNO3 solution,the specific capacitance was increased from 188.7F/g to 365.3F/g.PC-0.60N retained high capacitance retention as 81.4% after 3000 cycles.
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基金资助
福建省生态产业绿色技术重点实验室开发基金(WYKF2016-13);福建省教育厅基金项目(JK2014052);武夷学院校级青年基金(XQ201301);福建省大学生创新创业训练计划项目(201510397042,201510397043)
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