期刊
ADVANCED MATERIALS
卷 33, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202105761
关键词
droplet electricity generators; electric-double-layer capacitors; equivalent circuit model; interfacial effects; switch effects
类别
资金
- National Key Research and Development Program of China [2020YFB2008503]
- Shanghai Non-Silicon Micro-Nano Integrated Manufacturing Professional Technical Service Platform [20DZ2291300]
- National Natural Science Foundation of China [61974088]
- Advanced Research Ministry of Education Joint Foundation [6141A02022424]
This study focuses on the performance bottleneck of DEGs, proposing a switch effect based on EDLC and establishing an equivalent circuit model to explain its working mechanism. It is found that a single droplet without pre-charging can generate over 100 V of high voltage, and the output is improved by two orders of magnitude compared to TEI.
The working principle of the triboelectric nanogenerator (TENG), contact electrification and electrostatic induction, has been used to harvest raindrop energy in recent years. However, the existing research is mainly concentrated on solid-liquid electrification, and adopts traditional electrostatic induction (TEI) for output. As a result, the efficiency of droplet electricity generators (DEGs) is severely constrained. Therefore, previous studies deem that the DEG output is limited by interfacial effects. This study reveals that this view is inappropriate and, in reality, the output strategy is the key bottleneck restricting the DEG performance. Here, a switch effect based on an electric-double-layer capacitor (EDLC) is introduced, and an equivalent circuit model is established to understand its working mechanism. Without pre-charging, a single droplet can generate high voltage over 100 V and the output is directly improved by two-orders of magnitude compared with TEI, which is precisely utilizing the interfacial effect. This work provides insightful perspective and lays solid foundation for DEG applications in large scale.
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