Maity Debasis, Fussenegger Martin
Department of Biosystems Science and Engineering, ETH Zurich, Mattenstrasse 26, Basel, CH-4058, Switzerland.
Faculty of Science, University of Basel, Mattenstrasse 26, Basel, CH-4058, Switzerland.
Adv Sci (Weinh). 2023 Aug;10(22):e2300750. doi: 10.1002/advs.202300750. Epub 2023 May 18.
Existing devices for generating electrical power from water vapor in ambient air require high levels of relative humidity (RH), cannot operate for prolonged periods, and provide insufficient output for most practical applications. Here a heterogeneous moisture-driven electrical power generator (MODEG) is developed in the form of a free-standing bilayer of polyelectrolyte films, one consisting of a hygroscopic matrix of graphene oxide(GO)/polyaniline(PANI) [(GO)PANI] and the other consisting of poly(diallyldimethylammonium chloride)(PDDA)-modified fluorinated Nafion (F-Nafion (PDDA)). One MODEG unit (1 cm ) can deliver a stable open-circuit output of 0.9 V at 8 µA for more than 10 h with a matching external load. The device works over a wide range of temperature (-20 to +50 °C) and relative humidity (30% to 95% RH). It is shown that series and parallel combinations of MODEG units can directly supply sufficient power to drive commercial electronic devices such as light bulbs, supercapacitors, circuit boards, and screen displays. The (GO)PANI:F-Nafion (PDDA) hybrid film is embedded in a mask to harvest the energy from exhaled water vapor in human breath under real-life conditions. The device could consistently generate 450-600 mV during usual breathing, and provides sufficient power to drive medical devices, wearables, and emergency communication.
现有的用于从环境空气中的水蒸气发电的装置需要高相对湿度（RH），无法长时间运行，并且对于大多数实际应用而言输出功率不足。在此，开发了一种异质水分驱动的发电机（MODEG），其形式为独立的双层聚电解质膜，一层由氧化石墨烯（GO）/聚苯胺（PANI）[(GO)PANI]的吸湿基质组成，另一层由聚二烯丙基二甲基氯化铵（PDDA）改性的氟化纳夫离子（F-Nafion (PDDA)）组成。一个MODEG单元（1平方厘米）在匹配外部负载的情况下，能够在8微安时提供0.9伏的稳定开路输出，持续超过10小时。该装置在很宽的温度范围（-20至+50°C）和相对湿度范围（30%至95%RH）内都能工作。结果表明，MODEG单元的串联和并联组合能够直接提供足够的电力来驱动诸如灯泡、超级电容器、电路板和屏幕显示器等商业电子设备。(GO)PANI:F-Nafion (PDDA)混合膜被嵌入面罩中，以便在实际生活条件下从人体呼出的水蒸气中收集能量。该装置在正常呼吸过程中能够持续产生450 - 600毫伏的电压，并提供足够的电力来驱动医疗设备、可穿戴设备和应急通信设备。
