期刊
APPLIED SURFACE SCIENCE
卷 585, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.152579
关键词
Kevlar nanofibers; Carbon nanotube oxide; Vacuum assisted flocculation; Subzero temperature; Proton conductivity
类别
资金
- National Natural Science Foundation of China [21703029]
- Fundamental Research Funds for the Central Universities [N2005001]
In this research, multilayered membranes were constructed using the vacuum assisted flocculation technique and exhibited high and stable proton conductivity at subzero temperatures.
The application of proton exchange membranes in low temperature proton exchange membrane fuel cells requires the quick and stable proton conduction at subzero temperature. In this research, we constructed the multilayered membranes through the alternate deposition of poly(vinyl alcohol) (PVA), Kevlar nanofibers and carbon nanotube oxides (OCNTs) through the vacuum assisted flocculation (VAF) technique. The intermolecular hydrogen bonds resulted in the preparation of (PVA/Kevlar/OCNTs)3 membranes with layered structure. Phosphoric acid (PA) molecules entered the gaps between the neighboring layers accompanying with the phase separation. The prepared membranes exhibited the high and stable proton conductivity at subzero temperature, such as 2.04 x 10(-2) S/cm at-30 & DEG;C and 1.52 x 10(-1) S/cm at 30 & DEG;C. The proton conductivity gradually changed to 5.52 x 10(-2) S/cm and 1.84 x 10(-1) S/cm even after the ten-cycles process of-30 & DEG;C-30 & DEG;C. In addition, the value can retain 1.42 x 10(-2) S/cm at-30 & DEG;C in a 1900 h non-stop test. The evaporation and liquefaction of water molecules could affect proton conductivity besides PA dominating the proton conduction behavior during heating/cooling processes. Furthermore, the balance on low temperature proton conduction and mechanical strength makes the multilayered (PVA/Kevlar/OCNTs)(3)/PA membranes as a promising PEM candidate at subzero temperature.
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