化工进展2023，Vol.42Issue(11)：5871-5881,11.DOI:10.16085/j.issn.1000-6613.2022-2388
紫菜衍生的氮掺杂分级多孔炭制备及其超级电容性能
Fabrication of nitrogen-doped hierarchical porous carborn derived from porphyra and its supercapacitive properties
摘要
Abstract
Porphyra is not only inexpensive and easily available but also rich in protein.Employing porphyra as raw material to provide carbon and nitrogen sources,crude carbon was first prepared by pre-carbonization.Subsequently,it was further activated by KOH to create numerous pores in the final product,thus achieving the fabrication of nitrogen-doped hierarchical porous carbon.When the ratio of KOH to crude carbon was 2∶1,the resulting nitrogen-doped porous carbon(NDHPC-2)possessed the most abundant porosity and the best honeycomb-like hierarchal porous structure,whose specific surface area,mesopore percentage and nitrogen doping content were 1975.2m2/g,41.2% and 4.3% ,respectively.Moreover,the electrochemical tests in a three-electrode system showed that the NDHPC-2 electrode released a maximum specific capacitance of 185.4F/g with splendid rate performance,coulombic efficiency and cycle stability.Based on this carbon material,a symmetric supercapacitor(NDHPC-2//NDHPC-2)was built,which offered a largest energy density of 6.7Wh/kg and still maintained outstanding rate capability,coulombic efficiency and cycling durability.For example,when consecutively charged/discharged at a high current density of 10A/g for over 10000 cycles,the coulombic efficiency of such device was close to 100% from beginning to end and its capacitance decay was almost negligible during the whole experiment as well.The supercapacitive properties of NDHPC-2 porous carbon,both in three-and two-electrode systems,were comparable or even superior to those of many reported porous biomass carbon materials,therefore exhibiting excellent advantages for energy storage and promising potential toward practical applications.关键词
紫菜/多孔炭/超级电容器/碱活化/氮掺杂Key words
porphyra/porous carbon/supercapacitor/alkali activation/nitrogen doping分类
通用工业技术引用本文复制引用
肖巍,鲜小彬,梁果,杨欣雨,张艳华..紫菜衍生的氮掺杂分级多孔炭制备及其超级电容性能[J].化工进展,2023,42(11):5871-5881,11.基金项目
重庆市永川区自然科学基金(2022yc-jckx20011) （2022yc-jckx20011）
重庆文理学院重大培育项目(P2020CL02). （P2020CL02）
