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Assembling Hollow Carbon Sphere-Graphene Polylithic Aerogels for Thermoelectric Cells

Dong, D; Guo, H; Li, G; Yan, L; Zhang, X; Song, W; (2017) Assembling Hollow Carbon Sphere-Graphene Polylithic Aerogels for Thermoelectric Cells. Nano Energy , 39 pp. 470-477. 10.1016/j.nanoen.2017.07.029. Green open access

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Abstract

Aerogels are highly porous bulk materials assembled chemically or physically with various nanoscale building blocks and thus hold promise for numerous applications including energy storage and conversion. Assembling of hollow or porous particles with the diameter larger than 100 nm into hierarchically porous aerogels is efficient but challenging for achieving a high specific surface of aerogel. In this regard, submicron-sized carbon spheres with hollow cores and microporous shells are assembled into bulk aerogels, for the first time, in the presence of two-dimensional graphene sheets as special cross-linkers. The resulting bead-to-sheet polylithic aerogels show ultra-low density (51–67 mg cm−3), high conductivity (263–695 S m−1) and high specific surface area (569–609 m2 g−1). An application of thermocells is demonstrated with maximum output power of 1.05 W m−2 and maximum energy conversion efficiency of 1.4% relative to Carnot engine, outperforming the current simple U-shaped thermocells reported elsewhere.

Type: Article
Title: Assembling Hollow Carbon Sphere-Graphene Polylithic Aerogels for Thermoelectric Cells
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.nanoen.2017.07.029
Publisher version: https://doi.org/10.1016/j.nanoen.2017.07.029
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: Aerogel; Hollow carbon sphere; Graphene; Thermocell
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Surgical Biotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/1566909
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