具有高比电容的蘑菇衍生碳材料

Mushroom Derived Carbon Material with High Specific Capacitance

以三种不同种类的蘑菇为前驱体,经过高温热处理和氢氧化钾(KOH)活化,制备生物质炭;将制备的碳材料作为电化学活性物质,应用于电极并组装超级电容器器件。扫描电子显微镜(SEM)表征结果表明,蘑菇碳为不规则的块状结构,改性后的碳材料表面出现明显刻蚀及孔结构,氮气吸脱附曲线及孔径分布进一步说明活化后其比表面积和孔隙率发生显著变化。通过循环伏安(CV)、恒流充放电(GCD)和电化学阻抗谱(EIS)对其电化学性能进行测试,结果表明,三种碳材料在6 mol/L氢氧化钾电解液中均展现出优异的电化学性能。以杏鲍菇为前驱体制备的碳材料在电流密度为0.5 A/g时比电容高达427 F/g,其组装的对称器件在功率密度为150 W/kg时,能量密度可达7.8 Wh/kg。

In this paper,the carbon materials were prepared by high temperature heat treatment and KOH activation with three different kinds of mushrooms as precursors,the prepared carbon materials were used as electrochemical active substances and further used as electrodes and assemble supercapacitors.The results of scanning electron microscope(SEM)showed that the structure of the mushroom carbon was bulk,and a large number of pore structures appeared on the surface after modification.Nitrogen adsorption and desorption curves and the pore size distribution further indicated the significant changes of specific surface area and the porosity.The electrochemical performances of the materials were analyzed by cyclic voltammograms(CV),galvanostatic charge-discharge(GCD)and the electrochemical impedance spectroscopy(EIS)in 6 mol/L KOH electrolyte solution.All three carbon materials exhibited excellent electrochemical performance.The capacitance of the carbon material derived from pleurotus eryngii up to 427 F/g at the current density of 0.5 A/g.In addition,at a power density of 150 W/kg,the supercapacitor device delivers a high energy density of 7.8 Wh/kg.