Preparation of polytetrafluoroethylene porous membrane based composite alkaline exchange membrane with improved tensile strength and its fuel cell test

Cao, Yuan‐Cheng; Scott, Keith; Wang, Xu

doi:10.1016/j.ijhydene.2012.05.134

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…The peak power densities at 20 C and 45 C were respectively 114 and 163 mW cm À2 . The peak power density obtained in this study is comparable with results obtained with commercial Pt/C electrode [14]. However, such power density performances are several times smaller than that of PEMFC, of which the typical peak power density is 0.5e0.8 W cm À2 [13].…”

Section: Current Density Performancessupporting

confidence: 81%

“…Porous or expanded PTFE were adopted in some pore-filling composite membranes of PFSA ionomers [19e21]. Composite membranes of porous PTFE and quaternary ammonium polymer were reported recently for alkaline anion exchange membrane fuel cells [14,26]. In this study, the pristine qPDTB-OH À membrane and the composite membrane were compared in terms of conductivity, tensile strength, and the swelling effect.…”

Section: Introductionmentioning

confidence: 99%

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A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

Scott

Xie

Alford

2014

Journal of Power Sources

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Section: Current Density Performancessupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

Scott

Xie

Alford

2014

Journal of Power Sources

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“…This suggests that an extremely thin membrane free of tiny holes cannot be synthesized using this preparation method. This problem may be avoided using a porous PTFE membrane, followed by in situ synthesis of the objective ion conductor in the pores, as reported by Scott et al 32 Gas permeation and electrical properties of the Sn 0.92 Sb 0.08 P 2 O 7 -PTFE composite membrane with various thicknesses at 150 C were evaluated to dene the critical limit of thickness. Fig.…”

Section: Characterization Of the Composite Membranementioning

confidence: 99%

An intermediate-temperature alkaline fuel cell using an Sn_0.92Sb_0.08P₂O₇-based hydroxide-ion-conducting electrolyte and electrodes

Hibino

Kobayashi

2013

J. Mater. Chem. A

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Although various types of anion exchange membrane fuel cells have been developed, few alkaline fuel cells capable of operating at temperatures above 100 C have been reported, due to low chemical and thermal stability of the polymer electrolytes. Sn 0.92 Sb 0.08 P 2 O 7 is a hydroxide ion conductor that exhibits high conductivities ranging from 10 À2 to 10 À1 S cm À1 at elevated temperatures. This report describes the development of an intermediate-temperature alkaline fuel cell using an Sn 0.92 Sb 0.08 P 2 O 7 -based electrolyte and electrodes. First, a dense and flexible composite membrane, composed of Sn 0.92 Sb 0.08 P 2 O 7 and polytetrafluoroethylene (PTFE), was synthesized and characterized. In the composite membrane, a homogeneous distribution of Sn 0.92 Sb 0.08 P 2 O 7 particles was obtained at a thickness of 110 mm, yielding hydroxide ion conductivity of $10 À2 S cm À1 in the temperature range between 75 and 200 C. Next, the microstructure of the three-phase boundary in the electrode was established by incorporating Sn 0.92 Sb 0.08 P 2 O 7 particles into the electrode. Consequently, polarization resistance was reduced dramatically compared to that of the unmodified electrode. Finally, fuel cell tests were conducted using the optimized electrolyte and electrode. The peak power density was 76 mW cm À2 at 75 C, 94 mW cm À2 at 100 C, 114 mW cm À2 at 125 C, 130 mW cm À2 at 150 C, 132 mW cm À2 at 175 C, and 147 mW cm À2 at 200 C. High durability of the present fuel cell was also confirmed at 200 C.

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“…The aforementioned composite membrane is relatively dense, has good mechanical properties (with tensile strength of 32 MPa), water uptake of 62 ± 3.0%, and swelling ratio of 17 ± 2.0%. Cao et al 22 prepared a modified polyvinyl chloride/ polytetrafluoroethylene composite membrane, which enhanced the mechanical properties of the polyethylene chloride benzyl single phase membrane, and it was thinner and more favorable for fuel cell application. Therefore, due to its excellent mechanical properties and membrane characteristics, in this work, N‐vinyl formamide monomers were polymerized in situ in a porous PTFE matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation of composite anion exchange membranes based on in‐situ copolymerization of N‐vinyl formamide and divinylbenzene in porous PTFE

Luo

Wang

Ren

et al. 2020

J of Applied Polymer Sci

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A series of composite anion exchange membranes was synthesized via in-situ copolymerization of various ratios N-vinyl formamide (NVF) and divinylbenzene (DVB), supported by porous polytetrafluoroethylene (PTFE) polymer matrix, and followed by alkaline hydrolysis, and quaternization of the composite membranes with epoxypropyltrimethylammonium chloride (EPTMAC). FTIR and SEM analyses revealed that the composite membranes were successfully prepared. Moreover, the hydrophilic property of the composite membrane improved by introduction of the quaternized poly(NVF-co-DVB) copolymer. Water uptake, swelling ratio, and conductivity showed upward trends by increase of NVF amount. The copolymer with 95% of NVF showed the highest elongation at break (102%, room temperature) and conductivity (5.15 × 10 −2 S/cm, 80 C). After immersion of the PNDB 95%-N membrane in 5 mol/L NaOH solution for 96 h at room temperature, the conductivity (60 C) of the membrane decreased to 3.99 × 10 −2 S/cm. Moreover, the membrane registered weight loss under 4.5%, caused by degradation of the quaternary ammonium groups in NaOH solution. All in all, in 3 mol/L methanol solutions, the composite membranes showed permeability ranging from 7.6% to 19.7%, if compared to the Nafion ®-115 membrane, showing good alcohol resistance.

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Preparation of polytetrafluoroethylene porous membrane based composite alkaline exchange membrane with improved tensile strength and its fuel cell test

Cited by 15 publications

References 16 publications

A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

An intermediate-temperature alkaline fuel cell using an Sn_0.92Sb_0.08P₂O₇-based hydroxide-ion-conducting electrolyte and electrodes

Preparation of composite anion exchange membranes based on in‐situ copolymerization of N‐vinyl formamide and divinylbenzene in porous PTFE

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Preparation of polytetrafluoroethylene porous membrane based composite alkaline exchange membrane with improved tensile strength and its fuel cell test

Cited by 15 publications

References 16 publications

A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

A reversible water electrolyser with porous PTFE based OH− conductive membrane as energy storage cells

An intermediate-temperature alkaline fuel cell using an Sn0.92Sb0.08P2O7-based hydroxide-ion-conducting electrolyte and electrodes

Preparation of composite anion exchange membranes based on in‐situ copolymerization of N‐vinyl formamide and divinylbenzene in porous PTFE

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An intermediate-temperature alkaline fuel cell using an Sn_0.92Sb_0.08P₂O₇-based hydroxide-ion-conducting electrolyte and electrodes