Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 43, Issue 7, Pages 2974-2989Publisher
WILEY
DOI: 10.1002/er.4494
Keywords
carbon nanotubes; composite membrane; intermediate relative humidity; proton conductivity; SPEEK
Categories
Funding
- Ministry of Science, ICT and Future Planning [2017R1A2B4005230]
- Ministry of Trade, Industry Energy (MOTIE)
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20184030202210]
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A composite membrane composed of a sulfonated diblock copolymer (SDBC) based on poly(ether ether ketone) blocks copolymerized with partially fluorinated poly(arylene ether sulfone) and sulfonated carbon nanotubes (SCNTs) was fabricated by simple solution casting. Addition of the SCNT filler enhanced the water absorption and proton conductivity of membranes because of the increased per-cluster volume of sulfonic acid groups, at the same time reinforced the membranes' thermal and mechanical properties. The SDBC/SCNT-1.5 membrane exhibited the most improved physicochemical properties among all materials. It obtained a proton conductivity of 10.1 mS/cm at 120 degrees C under 20% relative humidity (RH) which was 2.6 times more improved than the pristine membrane (3.9 mS/cm). Moreover, the single cell performance of the SDBC/SCNT-1.5 membrane at 60 degrees C and 60% RH at ambient pressure exhibited a peak power density of 171 mW/cm(2) at a load current density of 378 mA/cm(2), while the pristine membrane exhibited 119 mW/cm(2) at a load current density of 294 mA/cm(2). Overall, the composite membrane exhibited very promising characteristics to be used as polymer electrolyte membrane in fuel cells operated at intermediate RH.
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