Heteroatom self-doped graphitic carbon materials from Sargassum thunbergii with improved supercapacitance performance  

作　　者：Hui Xu Lina Dong Bing Zhang Kun Wang Jiafeng Meng Yanwei Tong Hua Wang 

机构地区：[1]Huzhou Key Laboratory of Green Energy Materials and Battery Cascade Utilization,School of Intelligent Manufacturing,Huzhou College,Huzhou 313000,China [2]School of Chemistry and Materials Science,Ludong University,Yantai 264025,China [3]Huzhou Key Laboratory of Medical and Environmental Applications Technologies,School of Life Sciences,Huzhou University,Huzhou 313000,China

出　　处：《Advanced Sensor and Energy Materials》2024年第2期14-23,共10页先进传感器与能源材料（英文）

基　　金：supported by the Natural Science Foundation of Shandong Province(ZR2020MB075);the National Natural Science Foundation of China(22074079).

摘　　要：It is well-known that high specific surface area and improved pore structure is significantly desired for the application of supercapacitor based on biomass-based activated carbon.Herein,Sargassum thunbergii was selected as carbon precursor.Then,a simple and environmentally friendly method was designed to synthesize heteroatom self-doped porous carbon materials via synchronous activation and graphitization by using K_(2)FeO_(4).Our results demonstrated that activation temperature plays an important role in porous structure,morphology,and degree of graphitization,thus affecting the performance of supercapacitance.Sargassum thunbergii-based graphitized porous carbons STGPC-2 sample(calcination temperature at 700℃)has a large specific surface area(1641.98 m^(2)g^(-1)),pore volume(0.91 cm^(3)g^(-1)),high microporosity(Vmicro=0.62 cm^(3)g1,more than 68%),and a certain degree of graphitization.In three-electrode system,The STGPC-2 electrode exhibited a high specific capacitance of 325.5 F g^(-1)at 0.5 A g^(-1)and displays high rate capability(248 F g^(-1)at 10 A g^(-1)in 6 M KOH electrolyte).The symmetric STGPC-2 supercapacitor exhibits energy density as high as 21.3 Wh kg^(-1)(at a power density of 450 W kg^(-1))and excellent long-term cycling stability(97%capacitance retention after 3000 cycles)in 1 M Na2SO4 electrolyte.

关 键 词：Heteroatom self-doped graphitic carbon materials Synchronous activation and graphitization K_(2)FeO_(4) Sargassum thunbergii SUPERCAPACITANCE 

分 类 号：O64[理学—物理化学]