Gadipelli, Srinivas;
Akbari, Hanieh;
Li, Juntao;
Howard, Christopher A;
Zhang, Hong;
Shearing, Paul R;
Brett, Dan JL;
(2023)
Structure‐guided Capacitance Relationships in Oxidized Graphene Porous Materials Based Supercapacitors.
Energy & Environmental Materials
10.1002/eem2.12637.
(In press).
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Structure‐guided Capacitance Relationships in Oxidized Graphene Porous Materials Based Supercapacitors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/eem2.12637 |
| Publisher version: | https://doi.org/10.1002/eem2.12637 |
| Language: | English |
| Additional information: | © 2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10171041 |
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