Proton-conducting phosphotungstic acid/sulfonated fluorinated block copolymer composite membrane for polymer electrolyte fuel cells with reduced hydrogen permeability

Kim, Ae Rhan; Vinothkannan, Mohanraj; Kim, Jong Seok; Yoo, Dong Jin

doi:10.1007/s00289-017-2180-2

Cited by 18 publications

(15 citation statements)

References 48 publications

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“…However, for the PBI–HPW membrane, a strong decrease in proton conductivity is observed at 100 °C. Despite HPW having one of the strongest acidities among the different heteropoly acids, its solubility in water is very limited and this drawback has limited its use in PEMFCs, as only a few reports based on PBI [ 70 , 71 , 72 ] and other polymeric matrices [ 73 , 74 ] have been described.…”

Section: Resultsmentioning

confidence: 99%

A Deep Insight into Different Acidic Additives as Doping Agents for Enhancing Proton Conductivity on Polybenzimidazole Membranes

2020

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The use of phosphoric acid doped polybenzimidazole (PBI) membranes for fuel cell applications has been extensively studied in the past decades. In this article, we present a systematic study of the physicochemical properties and proton conductivity of PBI membranes doped with the commonly used phosphoric acid at different concentrations (0.1, 1, and 14 M), and with other alternative acids such as phytic acid (0.075 M) and phosphotungstic acid (HPW, 0.1 M). The use of these three acids was reflected in the formation of channels in the polymeric network as observed by cross-section SEM images. The acid doping enhanced proton conductivity of PBI membranes and, after doping, these conducting materials maintained their mechanical properties and thermal stability for their application as proton exchange membrane fuel cells, capable of operating at intermediate or high temperatures. Under doping with similar acidic concentrations, membranes with phytic acid displayed a superior conducting behavior when compared to doping with phosphoric acid or phosphotungstic acid.

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Section: Resultsmentioning

confidence: 99%

A Deep Insight into Different Acidic Additives as Doping Agents for Enhancing Proton Conductivity on Polybenzimidazole Membranes

2020

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“…This phenylene ring has four available ortho positions for sulfonation, but only one of the four protons is substituted by a sulfonic acid group since further sulfonation on the same ring is not possible because of the strong electron‐withdrawing effect of ─SO 3 H. Moreover, the other two phenylene rings connected to an ether and carbonyl group cannot be sulfonated either because of the deactivation effect of the carbonyl group . The hydrophobic oligomer, on the other hand, was synthesized via a nucleophilic substitution reaction between BCPSBP and HFIP using DMAc as the dipolar aprotic solvent, K 2 CO 3 as the base for scavenging protons, and toluene for the azeotropic removal of water . The reaction temperature was maintained at 160°C to create the most satisfactory conditions for the development of high molecular weight polymers.…”

Section: Resultsmentioning

confidence: 99%

“…The proton conductivity of membranes (3 cm × 0.5 cm) were evaluated at varied temperatures under 100% and 20% RH with a four‐probe Bekk‐Tech conductivity cell (Keithley‐2400 source meter) using an alternating current (AC) impedance method, as described in our previous works . The longitudinal conductivity ( σ ) was measured as a function of the temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The single cell performance was evaluated in a fuel cell test machine (Horizon Fuel Cell Technologies, Model: SKFC-TS001, South Korea) at 60°C and 60% RH at ambient pressure, as described by our previous study. 27 Briefly, the membrane electrode assembly (MEA) was fabricated via hot-pressing using commercial gas diffusion electrodes (GDEs) with Pt catalyst loading of 0.3 mg/cm 2 . Membranes (5 cm × 5 cm) were pretreated in a solution of 1 M H 2 SO 4 at 60°C for 1 hour, followed by water for 30 minutes.…”

Section: Membrane-electrode-assembly Fabrication and Single Cell Pementioning

confidence: 99%

“…28 The hydrophobic oligomer, on the other hand, was synthesized via a nucleophilic substitution reaction between BCPSBP and HFIP using DMAc as the dipolar aprotic solvent, K 2 CO 3 as the base for scavenging protons, and toluene for the azeotropic removal of water. 27 The reaction temperature was maintained at 160°C to create the most satisfactory conditions for the development of high molecular weight polymers.…”

Section: Synthesismentioning

confidence: 99%

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Amelioration in physicochemical properties and single cell performance of sulfonated poly(ether ether ketone) block copolymer composite membrane using sulfonated carbon nanotubes for intermediate humidity fuel cells

2019

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Summary 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°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°C and 60% RH at ambient pressure exhibited a peak power density of 171 mW/cm2 at a load current density of 378 mA/cm2, while the pristine membrane exhibited 119 mW/cm2 at a load current density of 294 mA/cm2. 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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Precise modification of poly(aryl ether ketone sulfone) proton exchange membranes with positively charged bismuth oxide clusters for high proton conduction performance

Yin

Zhang

et al. 2022

SusMat

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In the field of proton exchange membranes (PEMs), it is still a great challenge to explore new Nafion alternatives, maintaining the high proton conductivity and lowering the cost of practical application. In this work, a series of low sulfonated poly(aryl ether ketone sulfone) (SPAEKS) membranes hybridized by [Bi 6 O 5 (OH) 3 ] 2 (NO 3 ) 10 ⋅6H 2 O (H 6 Bi 12 O 16 ) have been successfully fabricated. When the doping amount of H 6 Bi 12 O 16 reaches 5 wt%, the DS15-Bi 12 -5 showing the best proton conductive ability and mechanical properties. The proton conductivity can achieve 72.8 mS⋅cm −1 at 80 • C and the tensile strength can reach 43.57 MPa. Confirmed by experimental data and activation energy (E a ) calculations, the existence of Bi cluster makes more hydrogen bonds, providing additional proton hopping sites and offers more proton transport vehicles, leading to a high proton conduction performance. This work proved that polyoxometalates (POMs) can replace the role of sulfonate groups in SPAEKS to a certain extent and work out the defects of high sulfonation, making a remarkable contribution to the practical application of low sulfonated SPAEKS.

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Proton-conducting phosphotungstic acid/sulfonated fluorinated block copolymer composite membrane for polymer electrolyte fuel cells with reduced hydrogen permeability

Cited by 18 publications

References 48 publications

A Deep Insight into Different Acidic Additives as Doping Agents for Enhancing Proton Conductivity on Polybenzimidazole Membranes

A Deep Insight into Different Acidic Additives as Doping Agents for Enhancing Proton Conductivity on Polybenzimidazole Membranes

Amelioration in physicochemical properties and single cell performance of sulfonated poly(ether ether ketone) block copolymer composite membrane using sulfonated carbon nanotubes for intermediate humidity fuel cells

Precise modification of poly(aryl ether ketone sulfone) proton exchange membranes with positively charged bismuth oxide clusters for high proton conduction performance

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