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Preparation and Performance of Black Liquor Lignin Basic Activated Woodceramics Doped Ni

YU Xian-Chun;SUN De-Lin;JI Xiao-Qin;College of Material and Engineering, Central South University of Forestry and Technology;  
Ni doping woodceramics were prepared from papermaking black liquor lignin and NiCl_2·6H_2O,which sintered at 1200℃and then activated with KOH.The Ni doping activated graphite woodceramics presents 3-D net structure with foam formation.X-ray diffraction,Raman spectrum,scanning electron microscope,transmission electron microscope,specific surface area tester,and electrochemical workstation were employed to characterize the samples.The results show that Ni constructs the framework of woodceramics,and catalyzes graphitization of amorphous carbon.The sample displays obvious graphitization tendency,and graphene lamellar structure is found.The lattice spacing is close to the lattice parameter of ideal graphite.Meanwhile,activating treatment can effectively form hierarchical porous and increase the quantity of micropores and ultramicropore.The pore diameter mainly concentrats at 3.60 nm,and the specific surface area increases from 359 m~2·g~(–1) to 856 m~2·g~(–1),as the sample activated at 800℃for 3 h.Additionally,activation improves the electrochemical performance of Ni doping woodceramics,whose specific capacitance is 153.8 F·g~(–1) at 20 mV·s~(–1 )scanning rate,2.2 times higher than that of non-activated sample.
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