Xia, D., Xu, Y., Mannering, J. et al. (6 more authors) (2021) Tuning the electrical and solar thermal heating efficiencies of nanocarbon aerogels. Chemistry of Materials, 33 (1). pp. 392-402. ISSN 0897-4756
Abstract
Nanocarbon aerogels display outstanding electrical and solar thermal heating efficiencies. However, little is known about the relationship between their microstructure and the heating performance. In this study, two different types of carbon nanotube (CNT) aerogels were synthesized via an ice-templating (IT) and emulsion-templating (ET) approach, respectively, which induces a drastic difference in internal microstructures, cross-linking densities, and porosities. These structural differences give rise to substantial efficiency differences in electrical aerogel heating (e.g., 46 °C/W for rET-CNT aerogel, 75 °C/W for rIT-CNT aerogel). Systematic comparison of nanocarbon aerogel microstructure in terms of nanocarbon type, envelope density, and nanocarbon graphiticity shows that the Joule-heating efficiency is highly correlated with the thermal conductivities of the aerogels, where aerogels with lower thermal conductivities exhibit higher Joule-heating efficiencies. This relationship is also observed for solar thermal aerogel heating, with the aerogels of lowest thermal conductivity (rIT-CNT aerogel) exhibiting a 30% higher efficiency in solar water evaporation, compared to rET-CNT aerogels. These results demonstrate that the heating properties of nanocarbon aerogels can be readily tuned and enhanced through structural control alone. The findings provide a new perspective for the design of nanocarbon aerogels for applications that involve electrical or solar thermal heating, such as temperature-dependent separation, sorption, sensing, and catalysis.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Chemical Society. This is an author-produced version of a paper subsequently published in Chemistry of Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | nanocarbon aerogels; tunable microstructures; thermal properties; Joule-heating; solar steam generation |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Jan 2021 08:00 |
Last Modified: | 01 Feb 2022 10:37 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Refereed: | Yes |
Identification Number: | 10.1021/acs.chemmater.0c04166 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:169421 |