以蒲草绒为碳源制备多孔碳及其在电化学中的应用

Porous carbonderived from flower spikes of Typhaorientalisused in electrochemistry

以蒲草绒为生物质碳源制备了具有高比表面积的多孔碳材料,其在超级电容器以及钠离子电池方面得到了较好的应用,并研究了不同活化比例对其电化学性能的影响。最佳比例条件下,0.5A/g的电流密度下,制备的碳材料在超级电容器中可以得到260F/g的比电容值,循环2500圈之后可以保持初始容量的92.7%;而在其作为钠离子电池负极的应用上,0.05A/g的电流密度下,其比容量可达245mAh/g;在大倍率(10A/g)下,其比电容仍然高达87mAh/g,在1A/g循环1000圈之后,其容量衰减仅衰减了16.4%,在5A/g循环1000圈仅衰减了11%,表现出了良好的电化学性能。

Porous carbon materials withhigh specific surface areaderived from flower spikes of Typhaorientalis was synthesized,which was used as electrode material for supercapacitor(SC)and sodium ion battery(SIB).Besides of its good application in SC and SIB,the influence to its electrochemical performance by controlling ratio of KOH and original sample was also studied.As a result,the specific capacitance of synthesized porous carbon is as high as 260F/g at a current density of 0.5A/g,and only 7.3% of capacitance loss after 2500 cycles.On the other side,the porous carbon was used as anode in SIBs,it has a high capacity of 245mAh/g after at 0.05A/g,even at 10A/g,the capacity is still 87mAh/g.Furthermore,its cycling performance is also good,after 1000 cycles at 1A/g and 5A/g,it only have 16.4% and 11% of capacity loss.