K_(2)FeO_(4)石墨化生物质多孔炭的制备及其电容性能

The Preparation and Capacitance Performance of the K_(2)FeO_(4)-activated Biomass Porous Carbon

采用K_(2)FeO_(4)浸泡和热处理相结合的方法制备了石墨化柚子皮多孔炭(GSPC).通过扫描电子显微镜(SEM)、比表面积分析(BET)、X射线衍射(XRD)、X射线光电子能谱(XPS)和拉曼光谱(Raman)对材料的形貌和组成进行表征.使用循环伏安法(CV)、交流阻抗法(EIS)和恒流充放电法(GCD)研究了GSPC的电容性能.结果表明:石墨化后材料的比表面积由75.91 m^(2)/g增大到619.78 m^(2)/g,孔容积由0.192 cm^(3)/g增大到0.425 cm^(3)/g;GSPC具有出色的双电层电容性能,在1 A/g的电流密度下,比电容达254 F/g,且具有优异的倍率性能(7 A/g的电流密度下,电容保持率为74%).此外,GSPC电极在100 mV/s下循环10000次的比电容没有衰减,具有优异的循环稳定性.此研究可为开发廉价的高性能生物质炭基材料提供新思路.

Graphitic shaddock peel porous carbon(GSPC)was prepared via acombination of K_(2)FeO_(4) soaking treatments and calcination.The morphology and composition of GSPC were studied with the scanning electron microscope(SEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Raman spectroscopy(Raman),and its capacitance performance was studied with cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and the galvanostatic charge-discharge experiment(GCD).The results showed that after the graphitization the BET surface area of porous carbon increased from 75.91 m^(2)/g to 619.78 m^(2)/g,and the pore volume increased from 0.192 cm^(3)/g to 0.425 cm^(3)/g.The GSPC electrode demonstrated a much higher specific capacitance of 245 F/cm^(2) at a current density of 1 A/g and excellent rate capability with the capacitance retention of 74%at the current density of 7 A/g.Moreover,the GSPC electrode also exhibited excellent cycle stability with no capacitance attenuation after 10000 cycles.This work provides a new path for the explorer of low-cost and high-performance biomass porous carbon.