Yan, T and Li, T and Xu, J and Chao, J and Wang, R and Aristov, YI and Gordeeva, LG and Dutta, P and Murthy, SS (2021) Ultrahigh-Energy-Density Sorption Thermal Battery Enabled by Graphene Aerogel-Based Composite Sorbents for Thermal Energy Harvesting from Air. In: ACS Energy Letters, 6 (5). pp. 1795-1802.
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Abstract
Sorption-based thermal storage has drawn considerable attention for sustainable and cost-effective thermal management and energy storage. However, the low sorption capacity of sorbents is a long-standing challenge for achieving high-energy-density sorption-based thermal storage. Herein, we demonstrate an ultrahigh-energy/power-density sorption thermal battery (STB) enabled by graphene aerogel (GA)-based composite sorbents for efficient thermal harvesting and storage with record performance. Scalable GA-based composite sorbents with high salt loading are synthesized by confined calcium chloride inside a GA matrix (CaCl2@GA), showing fast sorption kinetics and a large sorption capacity up to 2.89 g·g-1 contributed by the GA matrix and chemisorption-deliquescence-absorption of CaCl2. The STB realizes thermal charging-discharging via the multistep water desorption-sorption of CaCl2@GA sorbent with the humidity from air. Importantly, the lab-scale STB exhibits record energy density of 1580 Wh·kg-1 and power density of 815 W·kg-1 for space heating. Our work offers a promising low-carbon route for efficient thermal energy harvesting, storage, and utilization. ©
| Item Type: | Journal Article |
|---|---|
| Publication: | ACS Energy Letters |
| Publisher: | American Chemical Society |
| Additional Information: | The copyright for this article belongs to Authors |
| Keywords: | Aerogels; Calcium chloride; Cost effectiveness; Energy harvesting; Graphene; Heat storage; Secondary batteries; Sorbents; Thermal energy; Thermography (temperature measurement), Composite sorbents; Graphene aerogels; High energy densities; Sorption capacities; Sorption kinetics; Thermal batteries; Ultra-high energies; Water desorption, Sorption |
| Department/Centre: | Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 22 Jul 2021 10:07 |
| Last Modified: | 22 Jul 2021 10:07 |
| URI: | http://eprints.iisc.ac.in/id/eprint/68890 |
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