Preparation of nitrogen-doped hierarchical porous carbon and its zinc-ion energy storage characteristics
In this paper,the biomass derived porous carbon material(LPC)with natural spherical graded pore structure,which used lotus pollen as carbon source and ZnCl2 as activator in different proportions,was prepared by ultrasonic dispersion,one-step carbonization activation and high-energy bead grinding.The morphologic structure and electrochemical properties of AZIC were studied by using it as the anode material.The results show that the optimal activation mass ratio of ZnCl2 to pollen is 2∶1,and LPC at this time has a specific surface area of 1515.9 m2/g and exhibits the best charge and discharge characteristics.Under the current density of 0.1 A/g,the initial specific discharge capacity of LPC reaches 69.9 mA∙h/g.The capacity retention ratio is 79.9%after 1450 cycles at the current density of 5 A/g.These performance improvements are mainly attributed to the large specific surface area,abundant natural graded pore structure and doping properties of nitrogen and oxygen atoms of LPC,which provide a rapid diffusion path and a large number of electrochemically active sites for Zn2+,and induce additional pseudo capacitance.
zinc ion capacitorpollenporous carbonnitrogen-doped
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