高粱酒糟制备离子通道纳米纤维素碳气凝胶及储能应用OA

This work used sorghum distillers'grains with solubles as the raw material to prepare fiber-networked nanostructured cellulose(CNF)via an alkaline-oxidative delignification process.CNF was used as the network framework,and carbon nanotubes(CNT)provided the structure to build nanofibrillated cellulose-carbon aerogel with two continuous conductive/ionic channels.Scanning electron microscopy revealed that adding CNT created a more organized and stable 3D network structure.CNF was carbonized at 600℃and designated as CNF-P.CNF-P showed signs of pore collapse.However,CNF-CNT-600 and samples heated to higher temperatures maintained their interconnected structures.Thermogravimetric analysis showed that CNF started to decompose quickly at 260℃,but adding CNT slowed this down.Samples carbonized at 800-900℃only lost 2%-3%of their total mass.At the same time,the(002)peak(2θ=25.1°)in X-ray diffraction got stronger and sharper,while the Raman ID/IG value went down from 0.89(CNF-P)to 0.63(CNF-CNT-900),showing that CNT worked together to make graphite and greatly reduced problems in the structure.Galvanostatic charge-discharge tests indicated that CNF-CNT-900 exhibited specific capacitances of 128、59、38 and 21 F/g at current densities of 1,2,3 and 5 A/g,respectively,demonstrating excellent charge storage capability.Electrochemical impedance spectroscopy testing showed that there was much less equivalent series resistance and charge transfer resistance.This showed that there was better charge transfer and ion diffusion.