期刊
MICROMACHINES
卷 11, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/mi11100949
关键词
mesopore; micro; nanofluidics; ion current rectification; salinity gradient power
类别
资金
- Ministry of Science and Technology (MOST), Taiwan [MOST 108-2221-E-011-103-MY3, 108-2628-E-011-006-MY3, 108-2638-E-002-003-MY2]
Ample studies have shown the use of nanofluidics in the ionic diode and osmotic power generation, but similar ionic devices performed with large-sized mesopores are still poorly understood. In this study, we model and realize the mesoscale ionic diode and osmotic power generator, composed of an asymmetric cone-shaped mesopore with its narrow opening filled with a polyelectrolyte (PE) layer with high space charges. We show that, only when the space charge density of a PE layer is sufficiently large (>1x10(6) C/m(3)), the considered mesopore system is able to create an asymmetric ionic distributions in the pore and then rectify ionic current. As a result, the output osmotic power performance can be improved when the filled PE carries sufficiently high space charges. For example, the considered PE-filled mesopore system can show an amplification of the osmotic power of up to 35.1-fold, compared to the bare solid-state mesopore. The findings provide necessary information for the development of large-sized ionic diode and osmotic power harvesting device.
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