Super-hygroscopic film for wearables with dual functions of expediting sweat evaporation and energy harvesting

A Moisture‐Hungry Copper Complex Harvesting Air Moisture for Potable Water and Autonomous Urban Agriculture

“…[ 13,14 ] The atmospheric water harvesting technology opens up a self‐sustaining source of freshwater that can potentially support millions of drinking needs and agriculture. [ 15,16 ] In this work, to mitigate food and water shortage simultaneously, we have synthesized a hygroscopic copper(II)‐ethanolamine complex (Cu‐complex) to harvest atmospheric water and integrated this material into a fully automated solar‐driven device named SmartFarm, which can utilize harvested water to irrigate the plants daily without manual intervention ( Scheme ). As compared to the commonly used desiccants, such as silica gel, calcium chloride, and zeolite that suffer from relatively low water adsorption capacity and high regeneration temperature (>160 °C), [ 17,18 ] the prepared Cu‐complex features high water uptake of up to 3.0 g g −1 and fast water releasing process under natural sunlight.…”

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

“…9 Therefore, many novel sorbents such as metal-organic frameworks (MOFs), [10][11][12][13][14] hydrogels, [15][16][17] liquid solutions, 18,19 and composite sorbents 20,21 with extraordinary performance were designed and exploited by the efforts from materials scientists in past years. Lately, these novel sorbents with high water sorption performance and special thermal/electrical effects also inspired energy-related applications such as energy storage, 22,23 thermal management, [24][25][26][27] electricity/fuel generations, 28,29 or co-application. [30][31][32] The MOF-801-based solardriven SAWH prototype was first reported in 2017 with an all-in-one design by integrating light absorber, sorbent, and condenser in one chamber; 33 afterwards, the SAWH prototype was improved by introducing radiative cooling to promoting the water sorption at nightime.…”

Redox-induced electricity for energy scavenging and self-powered sensors

“…Electrochemical processes that initiate electron transfer for the change in the oxidation states of elements due to a redox reaction can be a source of electrical energy. Thus, several electrochemical redox reaction-based devices have been investigated for energy scavenging from human uids such as sweat, [25][26][27] glucose, 28,35 surrounding waste, 42 and some novel device architectures, 43,44 where many inorganic and organic ionic compounds are used as the source of chemical energy. Considering its versatile scope and simple mechanisms, the applicability of redox-based energy scavenging technology is rapidly gaining importance in the scientic community.…”

“…2c presents an implantable hybrid bioenergy harvesting device that can generate electricity via the triboelectric effect and the redox reaction between body uid (glucose) and electrodes. 36 In the literature, numerous body uid-harvesting devices have been investigated for bioenergy harvesting such as sweat, 26,27 glucose, 35 intestine liquid, 38 lactic acids, 25 and enzymes. 39 Besides, microbacterial fuel cells designed for harvesting diverse residual waste, algae, bacteria, and micro-organ-based catalysis have been reported for bioenergy scavenging through redox reactions.…”