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首页> 外文会议>International Conference on Materials for Renewable Energy and Environment >Facile preparation of porous carbons from rice husk by microwave heating for supercapacitors
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Facile preparation of porous carbons from rice husk by microwave heating for supercapacitors

机译：通过微波加热为超级电容器微波加热的米壳的含量准备

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Porous carbons (PCs) including microporous and mesoporous carbons for supercapacitors were made from rice husk through zinc chloride (ZnCl2) activation in one-step by microwave heating with microwave power at 600 W at 20 min heating time. PCs were characterized by field emission scanning electron microscope, transmission electron microscope and x-ray diffraction. The pore structure parameters and surface chemistry of PCs were obtained by nitrogen adsorption, Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy. The results show that the average pore size of PCs increases from 2.02 nm to 5.99 nm, and the total pore volume of PCs increases from 0.75 cm3/g to 2.07 cm3/g with the mass ratio of ZnCl2/rice husk. The specific surface area of PCs passes through a maximum with the ZnCl2/rice husk mass ratio, and reaches 1727 m2/g at 3/1 of ZnCl2/rice husk mass ratio. At 4/1 of ZnCl2/rice husk mass ratio, the specific capacitance of PC (PC4/1) only decreases from 182 F/g to 171 F/g with the increase of discharge current density from 0.05 A/g to 2 A/g, possessing a capacitance retention up to 94.0% due to its low densities of surface functional groups, good conductivity and mesopore structure. The energy density of PC4/1 capacitor retains at 6.23 Wh/kg after 1000 cycles, showing perfect cycle stability. The results evidenced that microwave heating ZnCl2 activating rice husk at 20 min heating time in one-step is an efficient approach to the rapid preparation of low cost yet high performance PCs for supercapacitors.
机译：包括微孔和中孔碳的多孔碳（PC）通过米壳通过氯化锌（ZnCl2）在一步中通过微波加热，在20分钟的加热时间下以600W的微波功率进行微波加热。通过场发射扫描电子显微镜，透射电子显微镜和X射线衍射的特征在于PC。通过氮吸附，傅里叶变换红外光谱和X射线光电子能谱获得PCS的孔结构参数和表面化学。结果表明，PC的平均孔径从2.02nm增加到5.99nm，PC的总孔体积从0.75cm 3 / g增加到2.07cm 3 / g，质量比ZnCl2 /稻壳的质量比。 PCS的比表面积通过ZnCl2 /稻壳质量比通过最大值，并在ZnCl2 /稻壳质量比的3/1达1727m 2 / g。在4/1的ZnCl2 /稻壳质量比中，PC（PC4 / 1）的比电容仅从182 f / g降低至171 f / g，随着0.05 a / g的输电电流密度增加到2 a / G，由于其表面官能团的低密度，良好的导电性和中孔结构，G，具有高达94.0％的电容潴留。 PC4 / 1电容器的能量密度在1000次循环后保持在6.23WH / kg，显示出完美的循环稳定性。结果证明了微波加热ZnCl2在一步中以20分钟的加热时间激活稻壳是一种有效的方法，可以快速准备超级电容器的低成本且高性能的PC。

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