Journal
ADVANCED SCIENCE
Volume 9, Issue 25, Pages -Publisher
WILEY
DOI: 10.1002/advs.202202869
Keywords
ion selective; Kevlar aramid nanofiber; membrane; nanofluidic; osmotic energy
Categories
Funding
- National Natural Science Foundation of China [22008077, 21861132013, 22138005, 22141001]
- Guang Dong Basic and Applied Basic Research Foundation [2019A1515110958]
- China Postdoctoral Science Foundation [2019TQ0101, 2019M662920]
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An advanced KANF membrane with high power density, mechanical strength and easy large-scale production has been developed for osmotic energy conversion. The membrane shows excellent cation selectivity and stability, making it highly promising for practical energy conversions.
An ion-selective membrane can directly convert the osmotic energy to electricity through reverse electrodialysis. However, developing an advanced membrane that simultaneously possesses high power density, excellent mechanical strength, and convenient large-scale production for practical osmotic energy conversion, remains challenging. Here, the fabrication of ultrathin and ultrastrong Kevlar aramid nanofiber (KANF) membranes with interconnected three-dimensional (3D) nanofluidic channels via a simple blade coating method is reported. The negatively charged 3D nanochannels show typical surface-charge-governed nanofluidic ion transport and exhibit excellent cation selectivity. When applied to osmotic energy conversion, the power density of the KANF membrane-based generator reaches 4.8 W m(-2) (seawater/river water) and can be further increased to 13.8 W m(-2) at 328 K, which are higher than most of the state-of-the-art membranes. Importantly, a 4-mu m-thickness KANF membrane shows ultrahigh tensile strength (565 MPa) and Young's modulus (25 GPa). This generator also exhibits ultralong stability over 120 days, showing great potential in practical energy conversions.
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