基于玉米秸秆合成的多孔生物质炭材料及其电化学储能

以玉米秸秆为原料,合成了高比表面积(2167 m²/g)的多孔生物质炭材料。 优化实验条件即可获得性能最佳的生物质炭电极材料,其在电流密度为1 A/g时的比电容高达390 F/g。 更重要的是,以所得最佳多孔生物质炭为电极材料,3 mol/L 的KOH溶液为电解质,组装了液相对称超级电容器。 该超级电容器在功率密度为818 W/kg时,其能量密度高达7 Wh/kg,在循环10000圈后的电容保持率为91.1%。 同时,将两个这种超级电容器串联充电之后,能够点亮15个LED灯并驱动小风扇正常工作。 这些结果表明,将基于玉米秸秆的多孔生物质炭作为先进电极材料应用于超级电容器具有较大的实际应用价值。

Synthesis and the Electrochemical Energy Storage of Porous Biomass Carbon from Corn Stalk

Porous biomass carbon with high specific surface area(2167 m²/g) was prepared from corn stalk. By optimizing the experimental conditions, porous biomass carbon material with the best performance can be obtained with specific capacitance of 390 F/g at a current density of 1 A/g. More importantly,liquid-phase symmetric supercapacitors were assembled with the optimal porous biomass carbon as the electrode material and 3 mol/L KOH solution as the electrolyte. The present symmetrical supercapacitors have an energy density of 7 Wh/kg at the power density of 818 W/kg, and 91.1% capacitance retention after 10000 cycles. Meanwhile, after charged, two such supercapacitors in series can easily illuminate 15 LED lights and drive the small fans to work normally. These results indicate that porous biomass carbon from corn stalks has great practical significance as an advanced electrode material for supercapacitors.