假槟榔花基多孔炭材料的制备及其电化学性能研究

以假槟榔花为原料, 经高温碳化和氢氧化钾活化制备得到假槟榔花基多孔炭材料。采用XRD、SEM、热重分析仪、比表面积及孔径分析仪等对多孔炭材料进行表征和分析, 用电化学工作站和恒流充放电测试仪测试其电化学性能。结果表明, 假槟榔花基多孔炭材料为无定形炭材料, 为纳米片层结构, 比表面积为1 223.32 m²/g。三电极体系中, 以1 mol/L H₂SO₄和6 mol/L KOH为电解液, 电流密度为0.5 A/g时, 其放电比电容分别为145 F/g和105 F/g; 20 A/g电流密度下, 放电比电容分别为100 F/g和80 F/g。二电极体系中, 在酸和碱条件下, 1 A/g电流密度下循环5 000圈, 其电容保持率均在98%以上。该材料具有高的比表面积和纳米片层结构, 有利于提高材料的电荷储存能力, 材料具有良好的超级电容器特性。

Synthesis and Electrochemical Properties of Porous Carbon Materials with Archontophoenix Alexandrae Flower

A porous carbon material was synthesized with archontophoenix alexandrae flower as the raw material by high-temperature carbonization and potassium hydroxide activation. Then the synthesized material was characterized and analyzed with XRD, SEM, TGA, specific surface area and BET, and its electrochemical performance was tested by using electrochemical workstation andconstant current charge/discharge tester. The results show that the synthesized porous carbon material is amorphous carbon material with nano-sheet structure, with a specific surface area of 1 223.32 m²/g. In a three-electrode system with 1 mol/L H₂SO₄ and 6 mol/L KOH as the electrolyte, the specific discharge capacity is 145 F/g and 105 F/g respectively at a current density of 0.5 A/g; the specific discharge capacity is 100 F/g and 80 F/g respectively at a current density of 20 A/g. In a two-electrode system under acid and alkali conditions, the capacity retention rate is still above 98% after 5 000 cycles at a current density of 1 A/g. It is shown that high specific surface area and nano-sheet structure of the synthesized material is beneficial to improve the charge-storage capacity of the material, leading to its good supercapacitor characteristics.