Li, Z;
Gadipelli, S;
Yang, Y;
He, G;
Guo, J;
Li, J;
Lu, Y;
... Guo, Z; + view all
(2019)
Exceptional supercapacitor performance from optimized oxidation of graphene-oxide.
Energy Storage Materials
, 17
pp. 12-21.
10.1016/j.ensm.2018.12.006.
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Abstract
Graphene-based materials are highly desirable for supercapacitors, but vary considerably in reported properties despite being prepared by similar procedures; therefore, a clear route to improve the performance is currently lacking. Here, a direct correlation between the initial oxidation of graphene-oxide precursors and final supercapacitor performance is demonstrated. Building on this significant understanding, the optimized three-dimensional graphene frameworks achieve a superior gravimetric capacitance of 330 F g−1 in an aqueous electrolyte. This extraordinary performance is also validated in various electrolytes at a device level. In a commercially used organic electrolyte, an excellent volumetric energy density of 51 Wh L−1 can be delivered, which significantly outperforms the state-of-the-art commercial carbon-based devices. Furthermore, solid-state supercapacitor with a gel electrolyte shows an impressive capacitance of 285 F g−1 with a rate capability of 79% at 20 A g−1 and capacitance retention of 93% after 20,000 cycles. This study presents a versatile design principle for engineering chemically derived graphene towards diverse applications in energy storage.
| Type: | Article |
|---|---|
| Title: | Exceptional supercapacitor performance from optimized oxidation of graphene-oxide |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ensm.2018.12.006 |
| Publisher version: | http://doi.org/10.1016/j.ensm.2018.12.006 |
| Language: | English |
| Additional information: | Copyright © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed. |
| Keywords: | Carbon,Graphene-oxide,Graphene,Supercapacitor,Energy storage |
| 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 UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10064671 |
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