Structure-guided Capacitance Relationships in Oxidized Graphene Porous Materials Based Supercapacitors

扫码查看

原文链接

维普
万方数据

外文摘要：Supercapacitors formed from porous carbon and graphene-oxide(GO)materials are usually dominated by either electric double-layer capacitance,pseudo-capacitance,or both.Due to these combined features,reduced GO materials have been shown to offer superior capacitance over typical nanoporous carbon materials;however,there is a significant variation in reported values,ranging between 25 and 350 F g-1.This undermines the structure(e.g.,oxygen functionality and/or surface area)-performance relationships for optimization of cost and scalable factors.This work demonstrates important structure-controlled charge storage relationships.For this,a series of exfoliated graphene(EG)derivatives are produced via thermal-shock exfoliation of GO precursors and following controlled graphitization of EG(GEG)generates materials with varied amounts of porosity,redox-active oxygen groups and graphitic components.Experimental results show significantly varied capacitance values between 30 and 250 F g-1 at 1.0 A g-1 in GEG structures;this suggests that for a given specific surface area the redox-active and hydrophilic oxygen content can boost the capacitance to 250-300％higher compared to typical mesoporous carbon materials.GEGs with identical oxygen functionality show a surface area governed capacitance.This allows to establish direct structure-performance relationships between 1)redox-active oxygen functional concentration and capacitance and 2)surface area and capacitance.

外文关键词：

electric double-layer capacitancegraphene-oxidepseudocapacitancestructure-performance relationshipssupercapacitors

作者：

Srinivas Gadipelli、Hanieh Akbari、Juntao Li、Christopher A.Howard、Hong Zhang、Paul R.Shearing、Dan J.L.Brett

展开 >

作者单位：

College of Physics,Sichuan University,Chengdu 610064,China

Electrochemical Innovation Lab,Department of Chemical Engineering,University College London,LondonWC1E 7JE,UK

Department of Physics and Astronomy,University College London,LondonWC1E 6BT,UK

基金：

EPSRCEPSRCEPSRCEPSRCEPSRCScience Specialty Program of Sichuan UniversityRoyal Academy of Engineer-ing under the Research Chairs and Senior Research Fellowships schemeRoyal Academy of Engineer-ing under the Research Chairs and Senior Research Fellowships schemeNational Physical Laboratory(NPL)HORIBA MIRA

项目编号：

EP/R511638/1EP/S018204/2EP/R023581/1EP/W03395X/1EP/W033321/12020SCUNL210CiET1718\59RCSRF2021/13/53

出版年：

2023

DOI：

10.1002/eem2.12637

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(4)

参考文献量69