Topic
Nafion
About: Nafion is a research topic. Over the lifetime, 9110 publications have been published within this topic receiving 320865 citations.
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TL;DR: In this article, the authors demonstrate the use of sulfuric acid loaded nanoporous silicon as a proton electrolytic membrane (PEM) material for micro-fuel cell applications.
90 citations
TL;DR: The gas permeability of dry Nafion films was determined at 2 atm and 35 °C for He, H2, N2, O2, CO2, CH4, C2H6, and C3H8.
Abstract: The gas permeability of dry Nafion films was determined at 2 atm and 35 °C for He, H2, N2, O2, CO2, CH4, C2H6, and C3H8. In addition, gas sorption isotherms were determined by gravimetric and barometric techniques as a function of pressure up to 20 atm. Nafion exhibited linear sorption uptake for low-solubility gases, following Henry’s law, and convex behavior for highly sorbing condensable gases, indicating rubber-like behavior at 35 °C. XRD results demonstrated that Nafion contains bimodal amorphous chain domains with average d-spacing values of 2.3 and 5.3 A. Only helium and hydrogen showed relatively high gas permeability of 37 and 7 barrers, respectively; all other gases exhibited low permeability that decreased significantly as penetrant size increased. Dry Nafion was characterized by extraordinarily high selectivities: He/H2 = 5.2, He/CH4 = 445, He/C2H6 = 1275, He/C3H8 = 7400, CO2/CH4 = 28, CO2/C2H6 = 79, CO2/C3H8 = 460, H2/CH4 = 84, H2/C2H6 = 241, and H2/C3H8 = 1400. These high selectivities could...
90 citations
TL;DR: In this article, a cross-section analysis of a proton-exchange membrane fuel cell with Nafion-coated membranes was performed using scanning electron microscopy (SEM).
90 citations
TL;DR: In this article, a stable sandwich-type amperometric biosensor based on poly(3,4-ethylenedioxythiophene) (PEDOT) and single walled carbon nanotubes (SWCNT)/ascorbate oxidase (AO)/Nafion films for detection of l -ascorbic acid (AA) was successfully developed.
Abstract: In this paper, a stable sandwich-type amperometric biosensor based on poly(3,4-ethylenedioxythiophene) (PEDOT)–single walled carbon nanotubes (SWCNT)/ascorbate oxidase (AO)/Nafion films for detection of l -ascorbic acid (AA) was successfully developed. PEDOT–SWCNT nanocomposite and Nafion films were used as inner and outer films, respectively. AO was immobilized between these two films. The PEDOT–SWCNT nanocomposite films were characterized by electrochemical impedance spectroscopy and scanning electron microscopy. The influence of detection potential and temperature on the biosensor performance was examined in detail. Despite the multilayer configuration, the biosensor exhibited a relatively fast response (less than 10 s) and a linear range from 1 μM to 18 mM (a correlation coefficient of 0.9974). The sensitivity of the biosensor was found to be 28.5 mA M −1 cm −2 . Its experimental detection limit was 0.7 μM ( S / N = 3) and the apparent Michaelis–Menten constant ( K m ) was calculated to be 18.35 mM. Moreover, the biosensor exhibited good anti-interferent ability and excellent long-term stability. All the results showed that such sandwich-type PEDOT–SWCNT/AO/Nafion films could provide a promising platform for the biosensor designs for AA detection.
90 citations
TL;DR: A simple formula for water permeability of a Nafion hollow-fiber membrane has been determined in this paper, which is proportional to the 1.5 power of the local partial pressure of water vapor in the gas phase.
90 citations