Thermoelectric generator based on anisotropic wood aerogel for low-grade heat energy harvesting

Zhao X. Chen Z. Zhuo H. Hu Y. Shi G. Wang B. Lai H. Araby S. Han W. Peng X. Zhong L.
1 September 2022 Chinese Society of Metals

Journal of Materials Science and Technology
2022 #120 150 - 158 pp.

Thermoelectric generators (TEGs) have received increasing attention due to their potential to harvest low-grade heat energy (<100 °C) and provide power for the Internet of Things (IoT) and wearable electronic devices. Herein, a wood-based ordered framework is used to fabricate carbon nanotube/poly(3, 4-ethylenedioxythiophene) (CNT/PEDOT) wood aerogel for TEG. The prepared CNT/PEDOT wood aerogel with an anisotropic structure exhibits a low thermal conductivity of 0.17 W m⁻¹ K⁻¹ and is advantageous to develop a sufficient temperature gradient. Meanwhile, CNT/PEDOT composites effectively decouple the relationship between the Seebeck coefficient and electrical conductivity by energy filtering effect to enhance thermoelectric (TE) output properties. The vertical TEG assembled by the CNT/PEDOT wood aerogels reveals an output power of 1.5 μW and a mass-specific power of 15.48 μW g⁻¹ at a temperature difference of 39.4 K. Moreover, the layered structure renders high compressibility and fatigue resistance. The anisotropic structure, high mechanical performance, and rapid thermoelectric response, enabling the TEG based on CNT/PEDOT wood aerogel offer opportunities for continuous power supply to low-power electronic devices.

Energy harvesting , Nano cellulose , Thermoelectric generator , Wearable devices , Wood

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State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
Department of Mechanical and Aerospace Engineering, Nazarbayev University, 53 Kabanbay Batyr Avenue, Nur-Sultan, Kazakhstan
State Key Laboratory of Bio-based Material and Green Papermaking, Qilu University of Technology, Jinan, 250353, China

State Key Laboratory of Pulp and Paper Engineering
Department of Mechanical and Aerospace Engineering
State Key Laboratory of Bio-based Material and Green Papermaking

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