Preparation of Porous Biomass-Derived Carbon Material and Its Sodium Storage Capacity

Abstract

Biomass-derived porous carbon(BDPC)was designed and prepared from Qamgur,a biomass from Xinjiang,China,as the carbon precursor,by pre-carbonization and activation,while retaining Qamgur’s inherent pore structure.The microstructure,phase composition and pore structure of the material were analyzed by scanning electron microscope(SEM),X-ray diffraction(XRD),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS)and nitrogen adsorption desorption test;The electrochemical properties of the material as a sodium storage anode were characterized by cyclic voltammetry,constant current charge-discharge, cycling,magnification and electrochemical impedance measurements.The results show that BDPC- 600 has good sodium storage performance because it contains nitrogen and oxygen heteroatoms(the contents are 3.36 at.% and 7.61 at.%,respectively).At 0.1A/g current density,after 100 cycles of charge and discharge,the reversible capacity is 187.7mAh/g,and the capacity retention rate is 88.7%.In addition, BDPC-900 has excellent magnification performance due to its large specific surface area(2396.60 m2/g)and pore volume(1.70cm3/g).