K2FeO4石墨化生物质多孔炭的制备及其电容性能

采用K₂FeO₄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 m2/g增大到619.78 m2/g，孔容积由0.192 cm3/g增大到0.425 cm3/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10 000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.

The Preparation and Capacitance Performance of the K2FeO4-activated Biomass Porous Carbon

Graphitic shaddock peel porous carbon (GSPC) was prepared via acombination of K₂FeO₄ 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 m2/g to 619.78 m2/g, and the pore volume increased from 0.192 cm3/g to 0.425 cm3/g. The GSPC electrode demonstrated a much higher specific capacitance of 245 F/cm2 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 10 000 cycles. This work provides a new path for the explorer of low-cost and high-performance biomass porous carbon.