夹心型生物碳电极材料的制备及超级电容器性能

Preparation of sandwich-type biochar electrode materials and study on performance of supercapacitor

摘要:

选择板栗壳为碳源（CC），碳化后用KOH活化，制得CC700-OH。对其形貌和性能进行了SEM、TEM、XRD以及BET等表征与测试，发现CC700-OH具有孔/片穿插的夹心结构，在1 A/g时比电容为540 F/g，循环6000圈后比电容仍可保持初始值的98%。在二电极体系中，组装CC700-OH//CC700-OH对称电容器，该对称电容器在1 A/g的比电容为106 F g-1，电势窗口宽0~1.6 V，首次库伦效益为0.52。功率密度为800 mW/g时，能量密度为37.3 mW•h/g，当功率密度增加至12000 mW/g时，能量密度仍可为23 mW•h/g。以上研究结果表明用板栗壳作为碳源制备对称性超级电容器电极材料是可行的。

Abstract:

The chestnut shell was selected as the carbon source (CC) and KOH was used to activate the carbonization products. The morphology and performance of electrode materials (CC700-OH) were tested. It was found that CC700-OH has a layered structure with holes / sheets interspersed, with a specific capacitance of 540 F/g at 1 A/g. Capacitor can still maintain 98% of initial value after 6000 cycles. In a two-electrode system, CC700-OH// CC700-OH symmetrical capacitor was assembled and has a specific capacitance of 106 F/g at 1 A/g and the potential window width is 0 to 1.6 V. When the power density is 800 mW/g, the energy density is 37.3 to mW•h/g and when the power density is increased to 12000 mW/g, the energy density can still be maintained at 23 mW•h/g. The above research results show that it is feasible to prepare symmetrical supercapacitor electrode materials using chestnut shell as carbon source.