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Regenerable aerogel‐based thermogalvanic cells for efficient low‐grade heat harvesting from solar radiation and interfacial solar evaporation systems

EcoMat (Beijing, China), 2023-03, Vol.5 (3), p.n/a [Peer Reviewed Journal]

2022 The Authors. published by The Hong Kong Polytechnic University and John Wiley & Sons Australia, Ltd. ;2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2567-3173 ;EISSN: 2567-3173 ;DOI: 10.1002/eom2.12302

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Title:
Regenerable aerogel‐based thermogalvanic cells for efficient low‐grade heat harvesting from solar radiation and interfacial solar evaporation systems
Author: Zhao, Jingyuan ; Wu, Xuan ; Yu, Huimin ; Wang, Yida ; Wu, Pan ; Yang, Xiaofei ; Chu, Dewei ; Owens, Gary ; Xu, Haolan
Subjects: Aerogels ; Carbon nanotubes ; Cellulose ; Cellulose fibers ; Cold ; Desalination ; Direct conversion ; Electricity ; Electricity generation ; Electrochemical cells ; Electrochemistry ; Electrodes ; Electrolytes ; Electrolytic cells ; Energy harvesting ; Energy management ; Evaporation ; Graphene ; Heat conductivity ; Heat loss ; Heat transfer ; Irradiation ; Latent heat ; Light ; low‐grade heat harvest ; Maximum power ; Performance degradation ; photothermal conversion ; Radiation ; Solar radiation ; solar steam generation ; Sun ; Temperature ; Temperature gradients ; Thermal conductivity ; thermal electrochemical cells ; Thermal energy ; thermogalvanic cells
Is Part Of: EcoMat (Beijing, China), 2023-03, Vol.5 (3), p.n/a
Description: Direct conversion of low‐grade heat into electricity by thermal electrochemical cells is a promising strategy for energy generation. For stable heat‐to‐electricity conversion, maintaining a low‐grade heat induced temperature difference between the cell electrodes is essential. Here, a thermogalvanic cell consisting of a cellulose fiber‐based porous aerogel, a liquid electrolyte, a reduced graphene oxide light absorber, and carbon nanotube‐based electrodes is designed for low‐grade thermal energy harvesting and conversion. The low thermal conductivity of the porous cellulose aerogel enables limited heat transfer from the hot side to the cold side, and thermal energy management effectively reduces heat loss from the hot side to the environment. Thus, a sustainable temperature difference between the electrodes is maintained and a corresponding maximum power output of 6.94 mW m−2 is achieved under natural solar irradiation. The obtained thermal electrochemical cells are also integrated into an enclosed interfacial solar evaporation device to harvest the latent heat released from vapor condensation for electricity generation. In addition, the thermal electrochemical cells can be regenerated after 18 months of storage and show no performance degradation. This design thus offers a novel alternative strategy for practical low‐grade heat harvesting. A regenerable aerogel‐based thermal electrochemical cell is designed to efficiently harvest low‐grade solar radiative heat and latent heat released from vapor condensation in a solar evaporation device. The unique interconnected pores and low thermal conductivity of the aerogel, as well as the thermal energy management lead to a stable temperature difference between the electrodes and reduced energy loss from the hot side of the cell, resulting in an excellent output power density of 6.94 mW m−2 under one sun illumination.
Publisher: Hoboken, USA: John Wiley & Sons, Inc
Language: English
Identifier: ISSN: 2567-3173
EISSN: 2567-3173
DOI: 10.1002/eom2.12302
Source: Open Access: DOAJ Directory of Open Access Journals
AUTh Library subscriptions: ProQuest Central

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Regenerable aerogel‐based thermogalvanic cells for efficient low‐grade heat harvesting from solar radiation and interfacial solar evaporation systems

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