An overview of the proton conductivity of nafion membranes through a statistical analysis

Liu, Lunyang; Chen, Wenduo; Li, Yunqi

doi:10.1016/j.memsci.2015.12.065

Cited by 168 publications

(96 citation statements)

References 41 publications

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“…Важным обстоятельством является то, что влажность Nafion, находящегося в равновесии, например, с кислородом со 100% относительной влажностью, не достигает ее предельной возможной величины (около 22 молекул H 2 O на одну группу −SO 3 H) и соответственно его ионное сопротивление примерно в 3−5 раз выше сопротивления полностью гидратированного Nafion [12,13].…”

Section: рабочая модельunclassified

Исследование Неоднородности Электрохимического Электрода Со Смешанной Проводимостью

Нечитайлов¹,

Глебова²,

Томасов³

et al. 2019

Журнал Технической Физики

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The ionic resistance of membrane–electrode assemblies of oxygen–hydrogen fuel cell electrodes containing platinum nanoparticles on carbon black, carbon nanofibers, and proton-conducting Nafion polymer in a wide range of compositions (10–80 wt %) are studied in situ by the methods of current–voltage characteristics, electrochemical impedance spectroscopy, and simulation of the impedance hodograph. Conditions that make it possible to correctly determine the ionic resistance of the electrode on the basis of an analysis of the linear approximation of the high-frequency region of the impedance hodograph are found. It is shown that the occurrence of inhomogeneities and an anomalous increase in the ionic resistance with an increase in the content of Nafion in the electrode are associated with a decrease in the volume fraction of water-generation centers (particles of electrochemically active platinum), which leads to incomplete wetting of Nafion.

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Section: рабочая модельunclassified

Исследование Неоднородности Электрохимического Электрода Со Смешанной Проводимостью

Нечитайлов¹,

Глебова²,

Томасов³

et al. 2019

Журнал Технической Физики

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“…Nafion is a perfluorosulfonated resin, well known for its superior thermal, mechanical, and chemical and electrochemical stability. 22 Nafion is widely used in electroanalysis as a coating of electrode to preconcentrate cations and/or to protect electrodes from anionic interferences and biological macromolecules. 23 The nafion modification membrane is a kind of ion-exchange polymer membrane, so it will be negative after ionization.…”

Section: Fabrications and Measurementsmentioning

confidence: 99%

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

Zhang

Hou

et al. 2016

J. Electrochem. Soc.

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A new antimony pH electrode by employing magnetron sputtering Sb thin film on copper substrates inlaying in printed circuit board (PCB) was developed. To improve the performance of the electrode, nafion membrane was employed as an alternative modification layer. The layer was formed simply by drop casting 5 wt% nafion solutions and drying the resultant coating. Further, the effect of the thickness of the Sb sensing thin film on the performance of antimony pH electrodes was investigated. Surface morphology, energy spectrum, and electrochemical experiments were conducted in Sb thin film thickness of ∼50, ∼150, ∼240, and ∼330 nm. Experimental results demonstrated excellent features of the pH electrodes with ∼240 nm thickness Sb thin film, including high sensitivity, short response time, high resolution, stability, reversibility, and long-term stability. The pH electrode is low cost, high performance, and simple preparation, is promising to popularize in laboratory and industrial production.As a typical electrochemical sensor, pH sensor has been received much attention in various fields, such as food spoilage monitoring, water pollution monitoring, soil pollution monitoring, biomedical sensing, industrial and chemical processing and structural health monitoring, where pH measurements are vital for the characterization of aqueous solutions. 1 Currently the most widely used technique for determination of pH in laboratory is the glass pH electrode. While the performance of the glass electrodes is excellent in terms of high sensitivity, long-term stability, high ion selectivity and wide operating range, such electrodes have many disadvantages including mechanical fragile, need for wet storage, large size, limited shape, high impedance and high cost. 2,3 Drawbacks of glass electrodes have led to intensive research for alternative pH electrodes. Potentiometric metal/metal oxide electrodes have proven to be some of the most promising candidates. 4 Various metals and metal oxides, such as Ti/TiO 2 , Zr/ZrO 2 , W/WO 3 , Ir/IrO 2 , Sb/Sb 2 O 3 , Ru/RuO 2 , and Pd/PdO, have been investigated for pH electrodes due to important attractive features, such as insolubility, mechanical strength, electro catalyst, stability, and manufacturing technology. 1,5-8 Among them, Ir/IrO 2 , Ru/RuO 2 , and Sb/Sb 2 O 3 have been popular research points recently. Some relative studies have been conducted in last decade.For Ir/IrO 2 , many groups tried to fabricate the iridium oxide electrode with some different manufacturing methods, for example, a novel melt-oxidized method, a new carbonate melt oxidation method, the electrodeposited method, the sol-gel fabrication process, and so on. 4,6,[9][10][11] For Ru/RuO 2 , Maurya et al. designed a miniaturized pH sensor employing an R. F. sputtered RuO 2 thin-film electrode in conjunction with an electroplated Ag/AgCl reference electrode, and some factors, such as temperature effects, Ar/O 2 flow ratio, and electrode thickness, were studied. The ruthenium oxide thin-film electrodes were applied in engin...

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“…Nafion is a copolymer of tetrafluoroethylene (PTFE) and a vinyl ether containing a sulfonyl fluoride group at the end. It has received a considerable attention as a proton conductor for PEMFCs due to its excellent thermal and mechanical properties [1,2].…”

Section: Introductionmentioning

confidence: 99%

Nafion membrane channel structure studied by small-angle X-ray scattering and Monte Carlo simulations

Bordín

Andrada

Carreras

et al. 2018

Polymer

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The structure of Nafion 117 membranes was studied through SAXS experiments and 2D pattern simulations. Measurements were taken for different moisture conditions by synchrotron radiation, and for different temperatures through X-ray tube irradiation. The experimental profiles were fitted through simulations based on a new structural model including: the amorphous polymer matrix, polymer crystallites, and inverse core-shell type channels conformed by water cylinders and sulfonic chains. The geometrical parameters intervening in the simulation of the SAXS patterns were optimized for each experimental condition. This approach allowed the proper description of the experimental SAXS profiles for the various moisture conditions studied. In addition, a recent lamelar model was also included in the assessments, and the corresponding performances were discussed.

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An overview of the proton conductivity of nafion membranes through a statistical analysis

Cited by 168 publications

References 41 publications

Исследование Неоднородности Электрохимического Электрода Со Смешанной Проводимостью

Исследование Неоднородности Электрохимического Электрода Со Смешанной Проводимостью

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

Nafion membrane channel structure studied by small-angle X-ray scattering and Monte Carlo simulations

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