Luyu Yang, Lei Zhang, Yang-Chun Yong, Dongping Sun
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引用次数: 0
摘要
无处不在的水汽蕴藏着巨大的清洁能源,水汽发电机(MEG)的出现有望随时随地为离网电子设备提供直接的电力支持。然而,大多数 MEG 都依赖于辅助储能设备和整流电路来驱动小型电子设备,这阻碍了其可扩展性和广泛应用,而开发可直接驱动离网电子设备的高功率输出直流(DC)MEG 前景广阔,但也充满挑战。在此,我们展示了一种具有分层纳米结构的自持式湿电发生器(SMEG),该结构基于一维(1D)带负电纳米纤维和二维(2D)导电纳米片,可利用大气湿度产生连续的直流电。细菌纤维素纳米纤维的硫酸盐化降低了表面电位并增加了表面电荷能,还原氧化石墨烯(rGO)为电子提供了传导途径。由一维纳米纤维和二维纳米片组合而成的分层纳米结构赋予了 SMEG 自我维持的湿度梯度和结构各向异性,从而迫使其产生伪电流。这种组合还构建了微电容器,进一步增强了湿电功率输出。SMEG 可产生超过 0.54 V 的连续电压,持续时间超过 2160 小时,功率密度约为 822 μW cm-3,显示了出色的运行耐久性。这项研究为开发可持续、多功能、高效的离网自供电设备电源提供了可行的解决方案。
A Direct Current Self-Sustained Moisture-Electric Generator with 1D/2D Hierarchical Nanostructure for Continuous Operation of Off-Grid Electronics.
Ubiquitous moisture is a colossal reservoir of clean energy, and the emergence of moisture-electric generators (MEGs) is expected to provide direct power support for off-grid electronic devices anytime and anywhere. However, most MEGs rely on auxiliary energy storage devices and rectifier circuits to drive small electronic devices, which hinder scalability and widespread deployment, and the development of direct current (DC) MEGs with high power output that can directly drive off-grid electronic devices is highly promising but challenging. Herein, a self-sustained moisture-electric generator (SMEG) with a hierarchical nanostructure based on one-dimensional (1D) negatively charged nanofibers and two-dimensional (2D) conductive nanosheets was demonstrated to generate continuous DC electricity from atmospheric humidity. Sulfation of bacterial cellulose nanofibers lowers the surface potential and increases the surface charge energy, and reduced graphene oxide (rGO) provides a conduction pathway for electrons. The hierarchical nanostructures constructed by the combination of 1D nanofibers and 2D nanosheets endow the SMEG with self-sustained moisture gradients and structural anisotropy, which force the generation of a pseudocurrent. This combination also constructs microcapacitors that further enhance the moisture-electric power output. The SMEG can generate a continuous voltage in excess of 0.54 V for over 2160 h, with a power density of about 822 μW cm-3, demonstrating excellent operational durability. This research provides a feasible solution for the development of sustainable, versatile, and efficient power supplies for off-grid self-powered devices.
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.