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Tuning the interlayer spacing of graphene laminate films for efficient pore utilization towards compact capacitive energy storage

Li, Z; Gadipelli, S; Li, H; Howard, CA; Brett, DJL; Shearing, PR; Guo, Z; ... Li, F; + view all (2020) Tuning the interlayer spacing of graphene laminate films for efficient pore utilization towards compact capacitive energy storage. Nature Energy , 5 (2) pp. 160-168. 10.1038/s41560-020-0560-6. Green open access

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Abstract

Supercapacitors have shown extraordinary promise for miniaturized electronics and electric vehicles, but are usually limited by electrodes with rather low volumetric performance, which is largely due to the inefficient utilization of pores in charge storage. Herein, we design a freestanding graphene laminate film electrode with highly efficient pore utilization for compact capacitive energy storage. The interlayer spacing of this film can be precisely adjusted, which enables a tunable porosity. By systematically tailoring the pore size for the electrolyte ions, pores are utilized optimally and thereby the volumetric capacitance is maximized. Consequently, the fabricated supercapacitor delivers a stack volumetric energy density of 88.1 Wh l−1 in an ionic liquid electrolyte, representing a critical breakthrough for optimizing the porosity towards compact energy storage. Moreover, the optimized film electrode is assembled into an ionogel-based, all-solid-state, flexible smart device with multiple optional outputs and superior stability, demonstrating enormous potential as a portable power supply in practical applications.

Type: Article
Title: Tuning the interlayer spacing of graphene laminate films for efficient pore utilization towards compact capacitive energy storage
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41560-020-0560-6
Publisher version: https://doi.org/10.1038/s41560-020-0560-6
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Energy & Fuels, Materials Science, Multidisciplinary, Materials Science, ALL-SOLID-STATE, SUPERCAPACITOR ELECTRODES, HIGH-PERFORMANCE, HIGH-POWER, CARBON, OXIDE, NITROGEN, DESIGN, DENSE
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/10095363
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