Fangzhou Li, Jian Zhao*, Bin Li, Zechao Han, Linglan Guo, Peicheng Han, Hyun Ho Kim, Yanjie Su, Li-Min Zhu and Daozhi Shen*,
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The moisture electric and triboelectric layers are based on a water-absorbent citric acid (CA)-mediated polyglutamic acid (PGA) hydrogel and porous electret expanded polytetrafluoroethylene (E-PTFE), respectively. Such a waterproof E-PTFE film not only enables efficient triboelectrification with water droplets' contact but also facilitates water vapor to be transferred into the hydrogel layer for moisture electricity generation. A single hybrid generator under water droplets' impact delivers a DC voltage of 0.55 V and a peak current density of 120 μA cm<sup>–2</sup> from the MEG, together with a simultaneous AC output voltage of 300 V and a current of 400 μA from the complementary water-based triboelectric generator (TEG) side. Such a hybrid generator can work even under harsh wild environments with 5 °C cold and saltwater impacts. 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引用次数: 0
摘要
基于湿气发生器(MEG)技术从无处不在的天然水蒸气中收集能量,在为便携式电子设备、物联网和无线传输供电方面具有巨大潜力。然而,大多数设备仍然面临输出功率低的挑战,而且很少有人将单一的 MEG 与另一种形式的能量收集技术相辅相成,以实现高功率。在此,我们报告了一种灵活、高效的混合发电机,它能够同时从水滴源头收集湿能和三电能。湿电层和三电层分别基于吸水性柠檬酸(CA)介导的聚谷氨酸(PGA)水凝胶和多孔驻极体膨体聚四氟乙烯(E-PTFE)。这种防水的 E-PTFE 薄膜不仅能与水滴接触实现高效的三电化,还能促进水蒸气进入水凝胶层进行湿发电。在水滴的冲击下,单个混合发电机从 MEG 输出 0.55 V 的直流电压和 120 μA cm-2 的峰值电流密度,同时从互补的水基三电发电器(TEG)侧输出 300 V 的交流电压和 400 μA 的电流。这种混合发电机即使在 5 °C 低温和盐水冲击的恶劣野外环境下也能正常工作。值得注意的是,利用混合发电机提供的电力,演示了一个适用于野外、复杂和紧急场景的光学报警和无线通信系统。这项工作拓展了水基发电技术的应用领域,并为在自然环境中获取多种潜在能量并实现高产出提供了启示。
Water-Triboelectrification-Complemented Moisture Electric Generator
Energy harvesting from ubiquitous natural water vapor based on moisture electric generator (MEG) technology holds great potential to power portable electronics, the Internet of Things, and wireless transmission. However, most devices still encounter challenges of low output, and a single MEG complemented with another form of energy harvesting for achieving high power has seldom been demonstrated. Herein, we report a flexible and efficient hybrid generator capable of harvesting moisture and tribo energies simultaneously, both from the source of water droplets. The moisture electric and triboelectric layers are based on a water-absorbent citric acid (CA)-mediated polyglutamic acid (PGA) hydrogel and porous electret expanded polytetrafluoroethylene (E-PTFE), respectively. Such a waterproof E-PTFE film not only enables efficient triboelectrification with water droplets' contact but also facilitates water vapor to be transferred into the hydrogel layer for moisture electricity generation. A single hybrid generator under water droplets' impact delivers a DC voltage of 0.55 V and a peak current density of 120 μA cm–2 from the MEG, together with a simultaneous AC output voltage of 300 V and a current of 400 μA from the complementary water-based triboelectric generator (TEG) side. Such a hybrid generator can work even under harsh wild environments with 5 °C cold and saltwater impacts. Significantly, an optical alarm and wireless communication system for wild, complex, and emergency scenarios is demonstrated with power from the hybrid generators. This work expands the applications of water-based electricity generation technologies and provides insight into harvesting multiple potential energies in the natural environment with high output.
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.