Bai Jiaxin, Huang Yaxin, Wang Haiyan, Guang Tianlei, Liao Qihua, Cheng Huhu, Deng Shanhao, Li Qikai, Shuai Zhigang, Qu Liangti
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China.
Key Laboratory of Organic Optoelectronics and Molecular Engineering, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Adv Mater. 2022 Mar;34(10):e2103897. doi: 10.1002/adma.202103897. Epub 2022 Jan 30.
It is a challenge to spontaneously harvest multiple clean sources from the environment for upgraded energy-converting systems. The ubiquitous moisture and sunlight in nature are attractive for sustainable power generation especially. A high-performance light-coordinated "moist-electric generator" (LMEG) based on the rational combination of a polyelectrolyte and a phytochrome is herein developed. By spontaneous adsorption of gaseous water molecules and simultaneous exposure to sunlight, a piece of 1 cm composite film offers an open-circuit voltage of 0.92 V and a considerable short-circuit current density of up to 1.55 mA cm . This record-high current density is about two orders of magnitude improvement over that of most conventional moisture-enabled systems, which is caused by moisture-induced charge separation accompanied with photoexcited carrier migration, as confirmed by a dynamic Monte Carlo device simulation. Flexible devices with customizable size are available for large-scale integration to effectively work under a wide range of relative humidity (about 20-100%), temperature (10-80 °C), and light intensity (30-200 mW cm ). The wearable and portable LMEGs provide ample power supply in natural conditions for indoor and outdoor electricity-consuming systems. This work opens a novel avenue to develop sustainable power generation through collecting multiple types of natural energy by a single hybrid harvester.
从环境中自发收集多种清洁能源用于升级能量转换系统是一项挑战。自然界中无处不在的水分和阳光尤其有利于可持续发电。本文基于聚电解质和光敏色素的合理组合，开发了一种高性能的光协同“湿电发电机”（LMEG）。通过自发吸附气态水分子并同时暴露在阳光下，一片1平方厘米的复合薄膜可提供0.92伏的开路电压和高达1.55毫安/平方厘米的可观短路电流密度。这一创纪录的高电流密度比大多数传统的基于水分系统提高了约两个数量级，这是由水分诱导的电荷分离以及光激发载流子迁移导致的，动态蒙特卡罗器件模拟证实了这一点。具有可定制尺寸的柔性器件可用于大规模集成，能在较宽的相对湿度范围（约20 - 100%）、温度范围（10 - 80°C）和光强范围（30 - 200毫瓦/平方厘米）下有效工作。可穿戴和便携式的LMEG在自然条件下为室内外用电系统提供充足的电力供应。这项工作开辟了一条通过单个混合采集器收集多种类型自然能量来开发可持续发电的新途径。
