Numerous studies have shown flexible electronics play important roles in health management. The way of power supply is always an essential factor of devices and self-powered ones are very attractive because of the fabrication easiness, usage comfort and aesthetics of the system. In this work, based on the metal-air redox reaction, which is usually used in designing metal-air batteries, we design a self-powered chemoelectric humidity sensor where a silk fibroin (SF) and LiBr gel matrix containing parallel aligned graphene oxide (GO) flakes serve as the electrolyte. The abundant hydrophilic groups in GO/SF and the hygroscopicity of LiBr lead to tight dependence of the output current on the humidity, enabling the sensor high sensitivity (0.09 μA/s/1%), fast response (1.05 s) and quick recovery (0.80 s). As proofs of concept, we design an all-in-one respiratory monitoring-diagnosing-treatment system and a non-contact human-machine interface, demonstrating the applications of the chemoelectric humidity sensor in health management.

大量研究表明柔性电子产品在健康管理中发挥着重要作用。供电方式始终是设备的一个重要因素，而自供电设备因其制造简便、使用舒适和系统美观而非常有吸引力。在这项工作中，基于通常用于设计金属-空气电池的金属-空气氧化还原反应，我们设计了一种自供电化学电湿度传感器，其中丝素蛋白（SF）和含有平行排列的氧化石墨烯的LiBr凝胶基质（ GO）薄片用作电解质。 GO/SF中丰富的亲水基团和LiBr的吸湿性导致输出电流对湿度的紧密依赖性，使传感器具有高灵敏度（0.09 μA/s/1%）、快速响应（1.05 s）和快速恢复（ 0.80 秒）。作为概念验证，我们设计了一种一体化呼吸监测诊断治疗系统和非接触式人机界面，展示了化学电湿度传感器在健康管理中的应用。