用过期切片面包制备环保超级电容器活性炭电极材料

考虑到世界上每天产生大量的过期面包等过期食品，以过期切片面包为原材料，经碳化、1 mol·L^-1 KOH活化并用稀盐酸中和及去离子水和乙醇洗涤后，制备了过期切片面包活性炭(EBAC)。对过期切片面包活性炭的表面形貌、物相结构、表面官能团、比表面积和孔径分布分别通过扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、氮气吸脱附(BET)进行了表征。在以3 mol·L^-1 KOH为电解液的三电极体系中，进行了活性炭电极材料的电化学性能测试。充放电曲线显示，在0.5 A·g^-1电流密度下，电极材料比电容达到352 F·g^-1；在5 A·g^-1的电流密度下循环1000次后，比电容保持在99.87%，展示出良好的循环稳定性。交流阻抗测试得到的Nyquist图和Bode图则近一步说明了过期切片面包活性炭具有良好的超级电容器性能。

An environmentally friendly activated carbon supercapacitor electrode material preparation with expired sliced bread

Considering a large amount of expired foods such as expired bread are generated in the world every day, expired sliced bread activated carbon (EBAC) was prepared from expired sliced bread by carbonization, activation with 1 mol·L^-1 KOH, neutralized with dilute hydrochloric acid, and then washed with deionized water and ethanol. The surface morphology, phase structure, surface functional groups, specific surface area and pore size distribution of expired sliced bread activated carbon were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption and desorption (BET). The electrochemical properties of activated carbon electrode materials were tested in a three-electrode system with the 3 mol·L^-1 KOH electrolyte. The charge-discharge curves show that the specific capacitance of the electrode material reaches 352 F·g^-1 at 0.5 A·g^-1 current density. After 1000 cycles at 5 A·g^-1 current density, the specific capacitance remains 99.87%, which shows good cyclic stability. At last, the Nyquist and Bode diagrams obtained by AC impedance measurement also shows that the expired sliced bread activated carbon has good supercapacitor performance.