Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 645, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.120194
Keywords
Cross-linking; HT-PEMs; Mechanical property; Proton conductivity; Fuel cell
Categories
Funding
- National of Key R&D Program of China [2018YFB1502303]
- National Natural Science Foundation of China [22178012, U19A2017, 21722601]
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The use of polymeric crosslinker improves mechanical properties and proton conductivity of high-temperature polymer electrolyte membranes. The quaternary amine groups introduced by crosslinking enhance phosphoric acid adsorption and retention capacity, while the increased molar free volume accommodates more phosphoric acid storage and reduces polymer main chain plasticization.
Poly(vinyl pyrrolidone) (PVP)-based high-temperature polymer electrolyte membranes (HT-PEMs) doped with phosphoric acid (PA) present an attractive prospect for high-temperature fuel cell. However, its proton conductivities and mechanical properties are inversely dependent on PVP content in membranes. Herein, chloromethyl-polysulfone is used as a polymeric crosslinker to fabricate cross-linked PVP. The effects of chloromethylation degree of polysulfone on PVP cross-linking degree, free volume and other parameters are studied. The quaternary amine groups introduced by cross-linking reaction enhances PA adsorption and retention capacity of membrane. The increased molar free volume created by polymeric crosslinker can accommodate more PA storage and reduce the polymer main chain plasticization. Thus, the mechanical properties of membranes are maintained. When compared to uncross-linked C-PVP-0/PA, the cross-linked C-PVP-13.7%/PA exhibits improved mechanical strength with increasement of 140% (4.5 MPa) and enhanced proton conductivity with increasement of 119% (120.0 mS cm(-1)@160 degrees C). Also, these superior characteristics allow a significantly enhanced H-2-O-2 fuel cell performance with the membrane of 724.9 mW cm(-2) @160 degrees C, which has increasement of 50% in comparison with that of the C-PVP-0%/PA membrane, and excellent durability. These praiseworthy results suggest that the cross-linked membrane within moderately molar free volume is potential to act as HT-PEMs materials for real world applications.
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