{"title":"Fluorine-doped graphene composite hydrogels with high bulk density for supercapacitors application","authors":"Jiajun Chen, Qingyun Zhou, Wenhui Ma, Chaohui Wang, Shan Fan, Yong Zhang","doi":"10.1007/s10854-024-13126-x","DOIUrl":null,"url":null,"abstract":"<p>The low bulk density and the lack of pseudocapacitive active sites greatly limit the practical application of graphene electrode materials. Herein, nanocellulose/fluorine-doped graphene composite hydrogels (NFGHs) were fabricated by a hydrothermal strategy. In this synthesis system, graphene oxide was used as carbon source and the regulator of the sample’s bulk density, and can also form the initial porous structure of NFGHs. Nanocellulose was used as upholder and electrolyte transport medium to improve the porous structure and hydrophilicity of the products. Besides, hydrofluoric acid acts as reducer and heteroatom source to fulfill the fluorine doping of NFGHs. The as-prepared NFGHs show high bulk density, copious pseudocapacitive active sites, fine porous structure, and good hydrophilicity. Therefore, the aqueous symmetric supercapacitors fabricated by NFGH5 exhibit large gravimetric (264.3 F g<sup>−1</sup>) and volumetric (309.2 F cm<sup>−3</sup>) specific capacitance, good rate characteristics, and excellent cycle durability. Furthermore, the flexible solid-state supercapacitors (FSSC) built by NFGH5 also deliver high specific capacitance (142.6 F g<sup>−1</sup>), benign rate capability (73.8% specific capacitance retention at 10 A g<sup>−1</sup>), and long service life. The strategy of this paper opens up a new idea for improving the implementation value of graphene-based supercapacitors.</p>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Science: Materials in Electronics","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s10854-024-13126-x","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
The low bulk density and the lack of pseudocapacitive active sites greatly limit the practical application of graphene electrode materials. Herein, nanocellulose/fluorine-doped graphene composite hydrogels (NFGHs) were fabricated by a hydrothermal strategy. In this synthesis system, graphene oxide was used as carbon source and the regulator of the sample’s bulk density, and can also form the initial porous structure of NFGHs. Nanocellulose was used as upholder and electrolyte transport medium to improve the porous structure and hydrophilicity of the products. Besides, hydrofluoric acid acts as reducer and heteroatom source to fulfill the fluorine doping of NFGHs. The as-prepared NFGHs show high bulk density, copious pseudocapacitive active sites, fine porous structure, and good hydrophilicity. Therefore, the aqueous symmetric supercapacitors fabricated by NFGH5 exhibit large gravimetric (264.3 F g−1) and volumetric (309.2 F cm−3) specific capacitance, good rate characteristics, and excellent cycle durability. Furthermore, the flexible solid-state supercapacitors (FSSC) built by NFGH5 also deliver high specific capacitance (142.6 F g−1), benign rate capability (73.8% specific capacitance retention at 10 A g−1), and long service life. The strategy of this paper opens up a new idea for improving the implementation value of graphene-based supercapacitors.
期刊介绍:
The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.