Proton-Conducting Membranes from Nafion&lt;SUP&gt;®&lt;/SUP&gt;/Polystyrene Sulfonate Composite for Fuel Cell Applications

Talukdar, Krishan; Kim, Hee Jin; Kim, Young Ho; Park, Younjin; Lee, Ho-Chang; Choi, Sang-June

doi:10.1166/jno.2015.1797

Cited by 6 publications

(2 citation statements)

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“…The first weight loss occurred up to 200 °C because of solvent evaporation (particularly, water molecules) . The second weight loss occurred from 300 to 400 °C because of the thermal decomposition of the polymer side chains, probably the sulfonic acid group. , The third weight loss occurred from 400 to 600 °C, which is related to the thermal oxidation of the polymer main chain . HZF had relatively higher thermal stability than Aquivion, resulting in it having slightly less weight loss in the high-temperature range .…”

Section: Resultsmentioning

confidence: 99%

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

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Heteropoly acids (HPAs) have been used in perfluorinated sulfonic acid polymers such as Nafion or Aquivion to form organic/inorganic composite membranes with improved proton conductivity and water management ability. However, the HPA has a low BET surface area with water-soluble characteristics, which prevents enhancement in the number of proton-transferable sites and accelerates HPA leaching while operating the proton exchange membrane fuel cells (PEMFCs). The HPA was functionalized on zeolite imidazolate framework-67 (ZIF-67) nanoparticles to address these drawbacks. Incorporating it into the MOF made it water insoluble and enhanced the internal surface area, leading to a good proton conductor. Using a synthetic approach, we were able to form HPA-functionalized ZIF-67 (HZF), which can be optimized with simple compositional modifications and whose HPA content is controllable. The HZF nanoparticles exhibited a hollow structure that formed an HPA−ZIF shell layer because the dissociated cobalt ion and 2-methylimidazole diffused from the core side to the surface layer to interact with the HPA. The HZF/Aquivion composite membranes exhibited excellent mechanical properties and good resistance to the polymer chain swelling phenomenon. The electrochemical properties of the HZF/ Aquivion composite membranes with various HZFs were characterized to determine the optimal HPA content in the HZF nanoparticles. The 3 wt % hollow HZF/Aquivion composite membrane with the appropriate HPA content exhibited higher proton conductivities than the pure Aquivion membrane, measuring 0.14 S/cm at 25 °C and 100% RH and 0.09 S/cm at 80 °C and 30% RH. This result indicates that the hollow HZF/Aquivion composite membrane can provide efficient proton transfer and water management ability, suggesting a good strategy for the PEMFC operation.

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Section: Resultsmentioning

confidence: 99%

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

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“…Both membranes were stable up to 280 °C. The stability began to decline after 280 °C because of the sulfonic acid group decomposition . In addition to water content, the polymer backbone water retention is an essential component of the fuel cell operation, particularly at high temperatures.…”

Section: Results and Discussionmentioning

confidence: 99%

Enhanced Proton Conductivity of a Zn(II)-Based MOF/Aquivion Composite Membrane for PEMFC Applications

2020

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The membrane electrode assembly (MEA) is considered as the center of the polymer electrolyte membrane fuel cell (PEMFC); a solid electrolyte membrane is an indispensable component of MEA. For membrane research and development, reducing ohmic resistance while improving mechanical stability is a challenge. Using short-side-chain (SSC) Aquivion perfluorosulfonic acid (PFSA) dispersion and considering the theory of coordination networks, the conductivity of the Aquivion polymer electrolyte membrane is improved by incorporating a highly proton-conductive and economical three-dimensional MOF {[(Me2NH2)3(SO4)]2[Zn2(ox)3]} n . The proton conductivity of the 1 wt % MOF-1/Aquivion composite membrane was improved by 13% compared to that of the pristine Aquivion membrane, 2 times that of Nafion and 1.5 times that of the MOF-1/Nafion composite. The water uptake and the ion-exchange capacity values are measured to analyze the fundamental properties of the membranes, and physical characterization techniques are also used.

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Proton-Conducting Membranes from Nafion<SUP>®</SUP>/Polystyrene Sulfonate Composite for Fuel Cell Applications

Cited by 6 publications

References 0 publications

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Enhanced Proton Conductivity of a Zn(II)-Based MOF/Aquivion Composite Membrane for PEMFC Applications

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