黄豆渣基多孔炭的制备及其超高电容的研究

Preparation of soy-based porous carbon and its high capacitance

以废弃物黄豆渣为原料,采用KOH化学活化方法制备了氮掺杂的高比表面积多孔炭材料.通过N2吸附-脱附、SEM、TEM和XPS等方法表征了黄豆渣基炭材料的孔道结构和表面性质.以此炭材料为电极材料,分别以1mol·L-1 H2SO4和6mol·L-1 KOH为电解液组装成超级电容器,利用循环伏安、恒流充放电和交流阻抗等电化学测试方法研究其电化学电容性能并详细阐释了其电容形成机制.结果表明,通过调节活化剂KOH与原料的质量比,可以得到不同比表面积和氮掺杂含量的炭材料,活化后的炭材料在1mol·L-1 H2SO4和6mol·L-1 KOH电解液中的电容值分别达到了410F·g-1和425F·g-1,且在氢氧化钾电解液中10A·g-1的大电流密度下,电容值仍能保持275F·g-1以上.

Nitrogen-doped porous carbons with high specific surface areas have been obtained from waste soya bean dreg by the carbonization with KOH.The pore structure and surface morphology of the carbon samples were characterized by N2 adsorption-desorption,SEM,TEM and XPS measurements.As the supercapacitor electrode material,the electrochemical properties were investigated by galvanostatic charge/discharge,cyclic voltammetry and impendance spectrum in1mol·L-1H2SO4 and 6mol·L-1 KOH electrolytes,respectively.The results showed that the specific surface area and nitrogen content of the carbons can be controlled by adjusting the mass of the KOH,and the maximum specific capacitances of carbons measured in 1mol·L-1H2SO4 and 6mol·L-1 KOH electrolytes are 410F·g-1 and 425F·g-1,respectively.Furthermore,a high specific capacitance(275F·g-1)was obtained even under 10A·g-1 when measured in 6mol·L-1 KOH electrolyte.