Oligomeric chain extender-derived poly(p-phenylene)-based multi-block polymer membranes for a wide operating current density range in polymer electrolyte membrane water electrolysis

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Hydrocarbon-based membranes can extend the operating current range of a polymer electrolyte membrane water electrolyzer (PEMWE) because of their low gas permeability and high proton conductivity. However, increasing the ion exchange capacity for sufficiently high proton conductivity leads to poor mechanical stability and increased gas permeability for hydrocarbon-based membranes. This study presents a poly(p-phenylene)-based multiblock polymer with an oligomeric chain extender (CE-sPP-PPES) for improved mechanical stability and extended operating current range. With the introduction of a chain extender, the mechanical and chemical stability were notably enhanced. The effects of ion exchange capacity on mechanical properties, proton conductivity, and hydrogen crossover were investigated compared to a Nafion membrane. The CE-sPP-PPES-based PEMWE has a 2.1 times wider operating current range than a Nafion-based PEMWE because of its smaller ohmic overvoltage and lower gas crossover at an optimal ion exchange capacity, demonstrating the possibility of a new hydrocarbon-based membrane for PEMWE.
Publisher
ELSEVIER
Issue Date
2022-04
Language
English
Article Type
Article
Citation

JOURNAL OF POWER SOURCES, v.526

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2022.231146
URI
http://hdl.handle.net/10203/296370
Appears in Collection
CBE-Journal Papers(저널논문)
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