Wang Shujun, Li Geng, Wen Jiayue, Feng Jiayun, Zhang He, Tian Yanhong
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450041, China.
Materials (Basel). 2025 Jun 12;18(12):2766. doi: 10.3390/ma18122766.
Moisture-electricity generators (MEGs) hold great promise for green energy conversion. However, existing devices focus on the need for complex gradient distribution treatments and the improvement in output voltage, overlooking the important role of the graphene oxide (GO) oxidation degree and the response time and recovery time in practical application. In this work, we develop printed MEGs by synthesizing reduced graphene oxide/silver nanoparticle (rGO/Ag) composites and controlling the GO oxidation degree. The rGO/Ag layer serves as a functional component that enhances cycling stability and shortens the recovery time. Additionally, compared to conventional rigid-structure devices, these flexible MEGs can be produced by inkjet printing and drop-casting techniques. A 1 cm MEG can generate a voltage of up to 60 mV within 2.4 s. Notably, higher output voltages can be easily achieved by connecting multiple MEG units in series, with 10 units producing 200 mV even under low relative humidity (RH). This work presents a low-cost, highly flexible, lightweight, and scalable power generator, paving the way for broader applications of GO and further advancement of MEG technology in wearable electronics, respiratory monitoring, and Internet of Things applications.
湿度-电力发电机（MEGs）在绿色能源转换方面具有巨大潜力。然而，现有的设备侧重于复杂的梯度分布处理需求和输出电压的提高，而忽视了氧化石墨烯（GO）氧化程度以及响应时间和恢复时间在实际应用中的重要作用。在这项工作中，我们通过合成还原氧化石墨烯/银纳米颗粒（rGO/Ag）复合材料并控制GO氧化程度来开发印刷MEGs。rGO/Ag层作为功能组件，可增强循环稳定性并缩短恢复时间。此外，与传统的刚性结构设备相比，这些柔性MEGs可以通过喷墨打印和滴铸技术生产。一个1厘米的MEG在2.4秒内可产生高达60毫伏的电压。值得注意的是，通过将多个MEG单元串联，可以轻松实现更高的输出电压，即使在低相对湿度（RH）下，10个单元也能产生200毫伏。这项工作展示了一种低成本、高度灵活、轻便且可扩展的发电机，为GO的更广泛应用以及MEG技术在可穿戴电子设备、呼吸监测和物联网应用中的进一步发展铺平了道路。
