Enabling giant thermopower by heterostructure engineering of hydrated vanadium pentoxide for zinc ion thermal charging cells

Zhiwei Li, Yinghong Xu, Langyuan Wu, Jiaxin Cui, Hui Dou and Xiaogang Zhang ()
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Zhiwei Li: Nanjing University of Aeronautics and Astronautics
Yinghong Xu: Nanjing University of Aeronautics and Astronautics
Langyuan Wu: Nanjing University of Aeronautics and Astronautics
Jiaxin Cui: Nanjing University of Aeronautics and Astronautics
Hui Dou: Nanjing University of Aeronautics and Astronautics
Xiaogang Zhang: Nanjing University of Aeronautics and Astronautics

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Flexible power supply devices provide possibilities for wearable electronics in the Internet of Things. However, unsatisfying capacity or lifetime of typical batteries or capacitors seriously limit their practical applications. Different from conventional heat-to-electricity generators, zinc ion thermal charging cells has been a competitive candidate for the self-power supply solution, but the lack of promising cathode materials has restricted the achievement of promising performances. Herein, we propose an attractive cathode material by rational heterostructure engineering of hydrated vanadium pentoxide. Owing to the integration of thermodiffusion and thermoextraction effects, the thermopower is significantly improved from 7.8 ± 2.6 mV K−1 to 23.4 ± 1.5 mV K−1. Moreover, an impressive normalized power density of 1.9 mW m−2 K−2 is achieved in the quasi-solid-state cells. In addition, a wearable power supply constructed by three units can drive the commercial health monitoring system by harvesting body heat. This work demonstrates the effectiveness of electrodes design for wearable thermoelectric applications.

Date: 2023
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DOI: 10.1038/s41467-023-42492-z

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