Abstract
In this work, we fabricated cross-linked pre-oxidized polyacrylonitrile nanofibers (PPNF) coating SO3H-UiO-66 coated (named SU6@PPNF), which was introduced into sulfonated poly (ether ether ketone) SPEEK to produce membrane with superior proton conductivity, dimensional stability and mechanical properties under hydrated condition. The membrane displays a maximum power density of 172.1 mW cm-2 under 100% RH and 60 °C, which is an increase of 12.2% compared with primary membrane.
Highlights
Proton exchange membrane fuel cell (PEMFC) is a significant electric supply technology because of their excellent energy density and environmental friendliness. 1 Among them, PEM is a key component requiring excellent proton conductivity, dimensional stability and mechanical strength
Metal organic framework (MOF) has regular structure and adjustable groups by changing the ligand, which is beneficial to adjust the groups of fiber according to desired properties when MOF is coated on fibers.[4]
At 60 °C and 100 % RH, the area swelling of SU6@pre-oxidized polyacrylonitrile nanofibers (PPNF)-SPEEK is only 69.1% of SPEEK. These results reveal that incorporating PPNF and SU6@PPNF nanofibers into SPEEK is an effective solution to improve the dimensional stability of membranes
Summary
Proton exchange membrane fuel cell (PEMFC) is a significant electric supply technology because of their excellent energy density and environmental friendliness. 1 Among them, PEM is a key component requiring excellent proton conductivity, dimensional stability and mechanical strength. Proton exchange membrane fuel cell (PEMFC) is a significant electric supply technology because of their excellent energy density and environmental friendliness. 1 Among them, PEM is a key component requiring excellent proton conductivity, dimensional stability and mechanical strength. Increasing the concentration of proton conductive groups (e.g., -SO3H) of membranes can improve proton conductivity.[2] excess proton conductive groups would weaken the dimensional stability and mechanical strength, leading to a degradation or even failure for the fuel cell. The development of PEM with great conductivity, dimensional stability and mechanical properties is essential for high-performance PEMFC. The sturdy fibers that building the 3D network in ionomer like steel bars can restrict water absorption, improving the dimensional stability and mechanical properties. MOF-coated fibers can functionalize the fiber without occupying the functional sites on the fiber, and maintain the inherent solvent resistant and mechanical properties of the fibers.[5]
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