Moisture-Driven Power Generation for Multifunctional Flexible Sensing Systems
Moisture-Driven Power Generation for Multifunctional Flexible Sensing Systems
复制标题
用于多功能灵活传感系统的湿气驱动发电
DOI：
10.1021/acs.nanolett.9b02081
复制
发表时间：
2019-08-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Ting
中科院分区：
文献类型：
--
作者：
Li, Lianhui;Chen, Zhigang;Zhang, Ting
灵活的自供电多功能传感系统为可穿戴电子设备的发展提供了一个很有前途的方向。尽管已经投入了更多的努力来开发自供电的集成器件，但开发具有小型化稳定电源的灵活和适应性强的传感系统是非常可取的，但也具有极大的挑战性。在本论文中，我们将多孔多巴胺层与羟基梯度(称为g-PDA)的湿度致能电源和柔性压力传感器相结合，构建了一种环境湿度感应型自供电可穿戴传感系统。由于g-PDA薄膜在水化过程中产生了大量的梯度分布的自由阳离子(H+)和局部受限的阴离子，使得g-PDA薄膜的湿气感应电势和有效输出功率密度迅速达到0.52V和0.246 mW·cm(-2)。重要的是，120 S以内输出的电压只有6%的变化，并且在1900年S衰减后仍能保持连续开路电压，这对于湿度产生的持续时间来说是一个突破。最后，一种自供电的可穿戴多功能传感系统已经被证明能够在不需要外部电源的情况下提供对人体生理信号的实时监测，这为未来的自供电多功能传感系统开辟了新的机会。
Flexible self-powered multifunctional sensing systems provide a promising direction for the development of wearable electronics. Although increased efforts have been devoted to developing self-powered integrated devices, the development of flexible and adaptable sensing systems with miniaturized stable power supplies is highly desirable yet greatly challenging. Herein, an ambient moisture-induced self-powered wearable sensing system was fabricated by integrating a porous polydopamine layer with a hydroxy group gradient (called g-PDA) based moisture-enabled power generator and a flexible pressure sensor. Due to the large amount of gradient-distributed free cations (H+) and locally confined anions produced in wide electrode spaces during hydration of the thin porous g-PDA film, the moisture-induced potential and effective output power density of the g-PDA-based power generator rapidly reaches up to 0.52 V and 0.246 mW cm(-2), respectively. Importantly, the voltage output within 120 s only has 6% change, and a continuously open-circuit voltage can be maintained after 1900 s of attenuation, which is a breakthrough for the duration of humidity generation. Finally, a self-powered wearable multifunctional sensing system has been demonstrated to be able to provide real-time monitoring of human physiological signals, without an external power supply, which opens new opportunities for future self-powered multifunctional sensing systems.