As a novel energy harvesting method, generating electricity from the interaction of liquid−solid interface has attracted growing interest. Although several functional materials have been carried out to improve the performance of the flowinduced hydrovoltaic generators, there are few reports on influencing the droplet flow behavior to excavate its electricity generation by governing the device structure. Here, the output performance of the graphene microfluidic channel (GMC) structure is ∼13 times higher than that of the flat-open space graphene morphology. The strong slip flow and high surface charge density near the graphene−droplet interface originate from the GMC structure, which produces an effective liquid−solid interaction and rapid relative movement of the droplet. Additionally, based on the GMC structure a self-powered pressure sensor is designed. The droplet motion is regulated by external forces to generate specific voltages, which provide a new approach for the development of wearable self-powered electronics.
Owing to the lightweight, flexibility, and molecular diversity, organic photothermal materials are considered promising solar absorbent materials for water-evaporating purification. Herein, we utilize the blend of two organic conjugated photothermal materials, PM6 and Y6, with broadband solar absorption from 350 to 1000 nm and high-efficiency photothermal properties to fabricate a Janus water evaporator on cellulose paper. Similar to the asymmetric wetting behavior on the lotus leaf, the evaporator shows efficient water adhesion on the bottom surface and water repellency on the top surface for a desirable self-floating capability and salt resistance. With a mass of only 0.5 mg per 3.14 cm 2 , the PM6:Y6 blend-based water evaporator achieves 88.9% of solar thermal conversion efficiency (η) and 1.52 kg m À2 h À1 of solar water evaporation rate (m) under 1.0 kW m À2 solar irradiation. These properties are almost the best performance among purely
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