Nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels for high-performance supercapacitors
作者机构：College of Materials Science and EngineeringGraphene Functional Materials Research LaboratoryQiqihar UniversityQiqihar 161006China College of Materials Science and EngineeringHeilongjiang Province Key Laboratory of Polymeric Composition MaterialQiqihar UniversityQiqihar 161006China School of Chemistry and Chemical EngineeringQiqihar UniversityQiqihar 161006China Department of Practice Teaching and Equipment ManagementQiqihar UniversityQiqihar 161006China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第7期
页 面：9519-9529页
核心收录：
学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0822[工学-轻工技术与工程]
基 金：The authors gratefully acknowledge the support from the National Natural Science Foundation of China(No.52072191) Heilongjiang Provincial Natural Science Foundation of China(No.LH2020E126) the Fundamental Research Fund of Heilongjiang Provincial University(No.135509204).
主 题：compact graphene composite hydrogel high packing density N/F co-doping gravimetric/volumetric performances supercapacitors
摘 要：Three-dimensional graphene materials have been studied as typical supercapacitors electrode materials by virtue of their ultrahigh specific surface area and good ion transport capacity.However,improvement of the poor volumetric electrochemical performance of these graphene materials has been required although they have high gravimetric energy density.In this work,nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels(NC-NFGHs)were prepared through a convenient hydrothermal approach utilizing ammonium fluoride as the heteroatom source.Nanocellulose(NC)and high concentration of graphene oxide(GO)were utilized to adjust the structure of NC-NFGHs and increase their packing density.Subsequently,the aqueous symmetric supercapacitor based on NC-NFGH-80 exhibits remarkable gravimetric(286.6 F·g^(-1))and volumetric(421.3 F·cm^(-3))specific capacitance at 0.3 A·g^(-1),good rate performance,and remarkable cycle stability up to 10,000 cycles.Besides,the all-solid-state flexible symmetric supercapacitors(ASSC)fabricated by NC-NFGH-80 also delivered a large specific capacitance of 117.1 F·g^(-1)at 0.3 A·g^(-1)and long service life over 10,000 cycles at 10 A·g^(-1).This compact porous structure and heteroatom co-doped graphene material supply a favorable strategy for high-performance supercapacitors.
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