Comparison of conductivity measurement systems using the example of nafion and anion exchange membrane

Germer, Wiebke; Harms, Corinna; Tullius, Vietja; Leppin, Janine; Dyck, Alexander

doi:10.1016/j.ssi.2015.02.023

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…The measurements were carried out by placing the doped membrane in a homemade Teflon cell with a design similar to the BT 112 commercial cell. 30 The cell has four platinum wire electrodes 0.5 mm in diameter, 5 mm length, and separated 5 mm among them. Humidification was carried out by introducing nitrogen at ca.…”

Section: Abpbi Synthesis-poly(25-benzimidazole)mentioning

confidence: 99%

Spray-Casting ABPBI Membranes for High Temperature PEM Fuel Cells

Viva¹,

Heredia²,

Palmbaum³

et al. 2017

J. Electrochem. Soc.

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The preparation and characterization of membranes of poly[2,5-benzimidazole] (ABPBI) by spray casting at room temperature from an ethanol solution is described. The prepared membranes doped with 11 M H 3 PO 4 sorbed 1.5 molecules of acid per imidazole ring exhibiting a proton conductivity of 0.05 S • cm −1 at 153 • C. The 80 μm thick, homogeneous, membranes obtained were used for the preparation of a membrane electrode assembly (MEA). Fuel cell test conducted with the prepared MEA at temperatures between 100 and 180 • C shows an increase in the performance with temperature, with a maximum power density of 200 mW • cm −2 at 180 • C. The described ABPBI membrane preparation method from an ethanol solution at low temperature opens a simple route for overcoming the processability problems of the aforementioned polymer.

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Section: Abpbi Synthesis-poly(25-benzimidazole)mentioning

confidence: 99%

Spray-Casting ABPBI Membranes for High Temperature PEM Fuel Cells

Viva¹,

Heredia²,

Palmbaum³

et al. 2017

J. Electrochem. Soc.

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show abstract

“…In-plane proton conductivity was determined using an ac -impedance method and a BekkTech four-electrode test cell [ 37 ]. Although the through-plane conductivity is most relevant to real-world membrane applications, the measurement is difficult to perform and prone to significant experimental errors, associated with estimating surface impedance at the membrane/electrode interfaces.…”

Section: Methodsmentioning

confidence: 99%

Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

2020

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Electrospinning was employed to fabricate composite membranes containing perfluorosulfonic acid (PFSA) ionomer, poly(vinylidene fluoride) (PVDF) reinforcement and a sulfonated silica network, where the latter was incorporated either in the PFSA matrix or in the PVDF fibers. The best membrane, in terms of proton conductivity, was made by incorporating the sulfonated silica network in PFSA fibers (Type-A) while the lowest conductivity membrane was obtained when sulfonated silica was incorporated into the reinforcing PVDF fibers (Type-B). A Type-A membrane containing 65 wt.% PFSA with an embedded sulfonated silica network (at 15 wt.%) and with 20 wt.% PVDF reinforcing fibers proved superior to the pristine PFSA membrane in terms of both the proton conductivity in the 30–90% RH at 80 °C (a 25–35% increase) and lateral swelling (a 68% reduction). In addition, it was demonstrated that a Type-A membrane was superior to that of a neat 660 EW perfluoroimide acid (PFIA, from 3M Co.) films with respect to swelling and mechanical strength, while having a similar proton conductivity vs. relative humidity profile. This study demonstrates that an electrospun nanofiber composite membrane with a sulfonated silica network added to moderately low EW PFSA fibers is a viable alternative to an ultra-low EW fluorinated ionomer PEM, in terms of properties relevant to fuel cell applications.

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“…The membrane resistance is an important parameter for evaluating membrane performance, and it is important in the practical applications of IEMs [34,35]. The membrane resistance was calculated using an electrochemical workstation (PGSTAT128N, Metrohm, Beijing, China).…”

Section: Experimental Methodsmentioning

confidence: 99%

Preparation of Nano-SiO2/Al2O3/ZnO-Blended PVDF Cation-Exchange Membranes with Improved Membrane Permselectivity and Oxidation Stability

et al. 2018

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Ion exchange membranes are used in practically every industry; however, most of them have defects such as low permeability and poor oxidation resistance. In this paper, cation-exchange membranes were prepared with poly (vinylidene fluoride) (PVDF) blended with nano-SiO2, nano-Al2O3 and nano-ZnO. Sulfonic acid groups were injected into the membrane prepared by styrene grafting and sulfonation. The methods used for characterizing the prepared membranes were Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and electrochemical measurements. Membrane performance, such as the ion exchange capacity (IEC), water uptake (WU), transport number, membrane permselectivity, membrane resistance, functional groups, and morphology were also evaluated. The hydrophilia, IEC, and permselectivity of cation-exchange membranes depended on the nanoparticle content of the membrane matrix. High transport property values were obtained, which increased with increasing nano-SiO2/Al2O3/ZnO weight fractions. Finally, the cation-exchange membranes prepared with 1.5% nano-SiO2, 2.0% nano-Al2O3 or 2.0% nano-ZnO all exhibited excellent membrane properties, including membrane permselectivity (PVDF/2% ZnO-g-PSSA membranes, 94.9%), IEC (PVDF/2% Al2O3-g-PSSA membranes, 2.735 mmol·g−1), and oxidation resistance (PVDF/1.5% SiO2-g-PSSA membranes, 2.33%). They can be used to separate applications in a variety of different areas, such as water treatment, electro-driven separation, heavy metal smelting, or other electrochemical processes.

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Comparison of conductivity measurement systems using the example of nafion and anion exchange membrane

Cited by 14 publications

References 6 publications

Spray-Casting ABPBI Membranes for High Temperature PEM Fuel Cells

Spray-Casting ABPBI Membranes for High Temperature PEM Fuel Cells

Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

Preparation of Nano-SiO2/Al2O3/ZnO-Blended PVDF Cation-Exchange Membranes with Improved Membrane Permselectivity and Oxidation Stability

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