菌糠基活性炭的制备及其电化学性能研究

Preparation and electrochemical performance of mushroom residue-based activated carbons

以廉价的菌糠废料为碳源,采用CO2活化法制备了可用作超级电容器电极材料的菌糠基活性炭(MACs),并研究了不同活化时间和活化温度对其孔隙结构、表面官能团及电化学性能的影响。研究结果表明,在CO2活化时间为20min、活化温度为1000℃的条件下,MACs的结构特性最优,其比表面积为305m^2/g、总孔容为0.373cm^3/g、中孔率为79.19%。在6mol/L KOH电解液的三电极测试体系中,材料所制备电极的比电容在电流密度为1A/g时可达194.9F/g,经过10 000次循环充放电后,比电容保持率为69.98%。

The cheap mushroom residue was used as carbon source to prepare the mushroom residue-based activated carbon(MACs)which can be used as electrode material of supercapacitor by CO2 activation method.The effects of different activation time and temperature on the pore structure,surface functional groups and electrochemical properties of MACs were investigated.The results showed that the structure of MACs was the best when the time of CO2 activation was 20min and the activation temperature was 1000℃,having a the specific surface area of 305m2/g,a total pore volume of 0.433cm3/g and a mesopore proportion of 79.19%.The test results in the three-electrode system with an electrolyte of 6mol/L KOH indicated that the specific capacitance of the electrode could reach 194.9F/g at the current density of 1A/g,and after 10,000 cycles of charging and discharging,the specific capacitance retention was 69.98%.