Improved Performance of Heat Source Free Water‐Floating Carbon Nanotube Thermoelectric Generators Controlling Wettability Using Atmospheric‐Pressure Plasma Jet and Waterproof Spray

• Published in: Advanced materials interfaces 2023-06, Vol.10 (16), p.n/a
• Main Authors: Chiba, Tomoyuki, Miura, Katsuma, Amma, Yuki, Kuwahata, Hiroshi, Takashiri, Masayuki
• Format: Article
• Language: English
• Subjects: Capillarity; carbon nanotube; Carbon nanotubes; Contact angle; Electric contacts; Electric potential; Electricity; Evaporative cooling; heat source free; Internet of Things; Light irradiation; Performance enhancement; Plasma jets; Temperature gradients; Thermoelectric generators; Thermoelectricity; Voltage; Water drops; Water temperature; Wettability
• ISSN: 2196-7350; 2196-7350
• DOI: 10.1002/admi.202300171

Water‐floating carbon nanotube thermoelectric generators (CNT‐TEGs) can effectively power Internet of Things (IoT) applications. CNT‐TEGs produce electricity by floating on water to generate a temperature gradient in the CNT films, where water pumping via capillary action causes evaporation‐induced cooling in selected areas. However, the amount of electricity required for target applications needs to be increased. Therefore, the wettability of CNT films is controlled via various treatments to increase water evaporation and temperature difference in the films. The contact angle of the water droplet on the film surface related to the wettability decreases upon atmospheric‐pressure plasma jet irradiation and increases upon waterproof spray treatment. Intermediate wettability is obtained by combining the two aforementioned treatments. Under the environmental conditions of light irradiation (1 kW m−2) and wind (3 m s−1) at a water temperature of 20 °C, the CNT‐TEGs with the combined treatment exhibit a highest output voltage of 3.9 mV, which is 30% larger than that of the pristine CNT‐TEG. At a water temperature of 60 °C, a highest output voltage of 13.1 mV is achieved in the pristine CNT‐TEG. The performance enhancement of CNT‐TEGs by controlling the wettability of CNT films under various environmental conditions can facilitate advancements in IoT technology. Water‐floating carbon nanotube thermoelectric generators (CNT‐TEGs) can effectively power Internet of Things applications. To increase the performance of CNT‐TEGs, wettability of CNT films is controlled using various treatments. Under the environmental conditions of light irradiation and wind at a water temperature of 20 °C, the performance of the wettability‐controlled CNT‐TEGs is 30% higher than that of the normal CNT‐TEGs.