Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 27, Pages 10646-10654Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja204166e
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Funding
- Ministry of Education, Culture, Sports, Science and Technology Japan [22760536, 23350089, 23656427]
- Grants-in-Aid for Scientific Research [23656427, 23350089, 22760536] Funding Source: KAKEN
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Anion conductive aromatic multiblock copolymers, poly(arylene ether)s containing quaternized ammonio-substituted fluorene groups, were synthesized via block copolycondensation of fluorene-containing (later hydrophilic) oligomers and linear hydrophobic oligomers, chloromethylation, quaternization, and ion-exchange reactions. The ammonio groups were selectively introduced onto the fluorene-containing units. The quaternized multiblock copolymers (QPEs) produced ductile, transparent membranes. A well-controlled multiblock structure was responsible for the developed hydrophobic/hydrophilic phase separation and interconnected ion transporting pathway, as confirmed by scanning transmission electron microscopic (STEM) observation. The ionomer membranes showed considerably higher hydroxide ion conductivities, up to 144 mS/cm at 80 degrees C, than those of existing anion conductive ionomer membranes. The durabilities of the QPE membranes were evaluated under severe, accelerated-aging conditions, and minor degradation was recognized by H-1 NMR spectra. The QPE membrane retained high conductivity in hot water at 80 degrees C for 5000 h. A noble metal-free direct hydrazine fuel cell was operated with the QPE membrane at 80 degrees C. The maximum power density, 297 mW/cm(2), was achieved at a current density of 826 mA/cm(2).
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