期刊
NANO ENERGY
卷 80, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105558
关键词
Droplet-based electricity generator (DEG); Moving boundary; Dynamic model; Surface charge density
类别
资金
- National Key Research and Development Program of China [2019YFA0705400]
- National Natural Science Foundation of China [51535005]
- State Key Laboratory of Mechanics and Control of Mechanical Structures [MCMS-I0419K01]
- Fundamental Research Funds for the Central Universities [NJ2020003, NZ2020001, NP2019301, NJ2019002, NC2018001, NE2020001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
By understanding the dynamic mechanism of droplet-based electricity generators and developing a surface charge density dynamic model, this research paves the way for optimal design and practical applications of DEGs.
The finding of power generation from droplets (Yin et al., 2014) [1], based on the moving boundary of electrical double layer, has triggered great research enthusiasm, and a breakthrough in instantaneous electric power density was achieved recently by a droplet-based electricity generator (DEG) (Xu et al., 2020) [2]. However, the dynamic mechanism for such droplet-based electricity generators remains elusive, impeding optimization of the DEGs for practical applications. Through comprehensive experiments, we developed a dynamic model of surface charge density that can explain the underlying mechanism for the DEGs. The spreading droplet in touch with the top electrode can be equivalently regarded as an additional part of the top electrode, and the change of droplet area causes the change of surface charge density of the top electrode, driving electrons to migrate between the two electrodes. The insight of the dynamic mechanism paves a way for optimal design and practical applications of the DEGs.
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