Fauziah Amalia Rizki, Schöfbeck Flora, Reithofer Michael R, Chin Jia Min
Institute of Functional Materials and Catalysis, Faculty of Chemistry, University of Vienna Währinger Straße 42 1090 Vienna Austria
Vienna Doctoral School in Chemistry (DoSChem), University of Vienna 1090 Vienna Austria.
J Mater Chem A Mater. 2025 Sep 16. doi: 10.1039/d5ta06289f.
Amid growing demand for clean, affordable, and sustainable energy, leveraging naturally available resources such as atmospheric moisture has become increasingly attractive. In this work, we introduce MOFs@FP-CB, a flexible Janus-like asymmetric membrane developed through a straightforward dip-coating process and engineered for efficient electrokinetic energy harvesting from controlled humidity. A carbon-black-modified filter paper substrate is coated with two functional layers of the membrane, comprising a hydrophilic, hygroscopic, negatively charged SO-MOF-808 layer on one side and a hydrophobic, positively charged ZIF-8 layer on the other side, arranged laterally. By creating a steady lateral moisture gradient, this asymmetric arrangement facilitates directed and selective ion transport nanoconfined MOF channels. The device produces a voltage of 0.20 V and a current of 20.6 μA at controlled conditions (25 °C and 65% relative humidity (RH)). Electrical output can be easily scaled owing to its modular design, reaching up to 129.7 μA and 1.49 V through basic parallel and series connections, respectively, and we further showed that the system is capable of powering a red LED when 20 membranes are connected in series. The membrane provides exceptional mechanical flexibility and operational durability while maintaining its performance under a wide range of environmental conditions, regardless of temperature and RH. These characteristics position MOFs@FP-CB as a viable and affordable platform for next-generation wearable, self-powered moisture energy harvesting systems.
在对清洁、经济实惠且可持续能源的需求不断增长的背景下，利用诸如大气湿度等天然可用资源变得越来越有吸引力。在这项工作中，我们介绍了MOFs@FP-CB，这是一种通过简单的浸涂工艺开发的类似柔性双面不对称膜，专为从可控湿度中高效收集动电能量而设计。一种炭黑改性的滤纸基材涂覆有该膜的两个功能层，一侧包括亲水性、吸湿性、带负电荷的SO-MOF-808层，另一侧包括疏水性、带正电荷的ZIF-8层，呈横向排列。通过创建稳定的横向湿度梯度，这种不对称排列促进了在纳米受限MOF通道中的定向和选择性离子传输。该装置在可控条件下（25℃和65%相对湿度（RH））产生0.20 V的电压和20.6 μA的电流。由于其模块化设计，电输出可以很容易地进行扩展，通过基本的并联和串联连接分别可达129.7 μA和1.49 V，并且我们进一步表明，当20个膜串联连接时，该系统能够为一个红色发光二极管供电。该膜具有出色的机械柔韧性和操作耐久性，同时在广泛的环境条件下，无论温度和相对湿度如何，都能保持其性能。这些特性使MOFs@FP-CB成为下一代可穿戴自供电湿度能量收集系统的一个可行且经济实惠的平台。
