Chestnut-derived porous carbon with O and N co-doping as electrode for high-performance supercapacitor  

栗树干衍生O和N共掺杂多孔碳的制备及其电容性能研究

作　　者：LIU Qi XIA Hui LIU Shao-bo Lei Wen-tao 刘淇;夏辉;刘少波;雷闻韬(School of Physics,Central South University,Changsha 410083,China;Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering,School of Physics and Electronic Science,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]School of Physics,Central South University,Changsha 410083,China [2]Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering,School of Physics and Electronic Science,Changsha University of Science and Technology,Changsha 410114,China

出　　处：《Journal of Central South University》2024年第12期4638-4653,共16页中南大学学报(英文版)

基　　金：Project(2023JJ40040)supported by the Natural Science Foundation of Hunan Province,China;Project(502221904)supported by the Project of Innovation-Driven Plan in Central South University,China;Project(24C0140)supported by the Scientific Research Fund of Hunan Provincial Education Department,China。

摘　　要：The capacitive performance of carbon materials as supercapacitor electrode is synergistically influenced by the surface porous structure,graphitization structure,and surface atomic doping.However,simple realization of their synergistic regulation still faces significant challenges.Based on the biological porous structure,heteroatom-rich content and low cost of chestnut,this work adopt chestnut as precursor to prepare carbon electrode,of which the pores,graphitization,and surface atomic doping are synergistically regulated by simply changing the activation temperature.The optimized carbon electrode possesses a hierarchical porous structure with partial graphitization and O and N co doping.Benefited from these merits,the chestnut-derived porous carbon as a supercapacitor electrode,can achieve a high specific capacitance of 328.6 F/g at 1 A/g,which still retains 80.8%when the current density enlarging to 20 A/g.By packaging the symmetric electric double-layer capacitor,the device exhibits a specific capacitance of 63.6 F/g at 1 A/g,delivering an energy density of 12.7 W·h/kg at a power density of 600 W/kg.The stability of the device is tested at a current density of 20 A/g,which shows a capacitance retention rate of up to 90%after 10000 charge-discharge cycles.碳材料作为超级电容器电极的电容性能受到表面多孔结构、石墨化结构和表面原子掺杂的协同影响。然而,简单实现它们的协同调控仍然面临着重大挑战。基于栗树干的生物多孔结构、富含杂原子和低成本的特点,本研究采用栗树干作为生物质前驱体制备碳电极,通过改变活化温度,实现了电极中孔隙、石墨化和表面原子掺杂结构的协同调控。优化的栗树干衍生碳展现出部分石墨化、O和N共掺杂以及分级多孔的复合结构。受益于这些优点,栗树干衍生多孔碳作为超级电容器电极在1 A/g下展现出328.6 F/g的高比电容,并且当电流密度增加至20 A/g时,电容仍保持80.8%。通过利用该电极封装对称双电层电容器,器件在1 A/g下获得了63.6 F/g的比电容,且在600 W/kg的功率密度下可输出12.7 W·h/kg的能量密度。通过在20 A/g的高电流密度下进行循环稳定性测试,该器件在10000次充放电循环后,电容保持率高达90%。

关 键 词：SUPERCAPACITORS chestnut-derived carbon porous and graphitic structure heteroatom doping capacitance 

分 类 号：O64[理学—物理化学]