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: Ionic conductivity and swelling data are measured for Nafion® perfluorinated ionomeric membranes in nonaqueous solvents and solvent mixtures and correlated with solvent physical properties as mentioned in this paper.
153 citations
TL;DR: Because of the good balance of proton conductivity and vanadium ion permeability, blend membrane with 20 wt % PAN (S/PAN-20%) showed higher Coulombic efficiency and energy efficiency than Nafion 117 membrane when they were used in VRFB single cell.
Abstract: Acid–base blend membrane prepared from sulfonated poly(ether ether ketone) (SPEEK) and polyacrylonitrile (PAN) was detailedly evaluated for vanadium redox flow battery (VRFB) application. SPEEK/PAN blend membrane exhibited dense and homogeneous cross-section morphology as scanning electron microscopy and energy-dispersive X-ray spectroscopy images show. The acid–base interaction of ionic cross-linking and hydrogen bonding between SPEEK and PAN could effectively reduce water uptake, swelling ratio, and vanadium ion permeability, and improve the performance and stability of blend membrane. Because of the good balance of proton conductivity and vanadium ion permeability, blend membrane with 20 wt % PAN (S/PAN-20%) showed higher Coulombic efficiency (96.2% vs 91.1%) and energy efficiency (83.5% vs 78.4%) than Nafion 117 membrane at current density of 80 mA cm–2 when they were used in VRFB single cell. Besides, S/PAN-20% membrane kept a stable performance during 150 cycles at current density of 80 mA cm–2 in t...
153 citations
TL;DR: In this article, the structural orientation of Nafion films in an ambient environment and under stretching was analyzed using small/wide-angle X-ray scattering, based on the absolute values of Hermans' orientation factor.
Abstract: The structural orientation in Nafion films in an ambient environment and under stretching is analyzed using small/wide-angle X-ray scattering. On the basis of the absolute values of Hermans' orientation factor, we characterize the structural anisotropy at different length scales (between angstroms and several hundreds of angstroms) in agreement with a previously proposed fibrillar model of the Nafion membrane. Bundles of elongated polymeric aggregates orient at small draw ratios, together with an orientation of the aggregates within such a bundle. The crystal structure of this semicrystalline polymer is analyzed, and we show that the crystallinity of the Nafion film does not change as a function of the draw ratio.
152 citations
TL;DR: In this article, the authors studied the transport of water and anions (OH−, HCO3−, F−, Cl−, Br−, and I−) in poly(arylene ether) anion exchange membrane with quaternary ammonium functional groups.
152 citations
TL;DR: In this paper, a novel and sensitive non-enzymatic glucose sensor was developed based on the modification of Au@Cu2O nanocomposite on the surface of glassy carbon (Au@cu2O/Nafion/GC) electrode.
Abstract: A novel and sensitive non-enzymatic glucose sensor was developed based on the modification of Au@Cu2O nanocomposite on the surface of glassy carbon (Au@Cu2O/Nafion/GC) electrode. Au@Cu2O nanocomposites were prepared using a facile chemical reduction method and its core-shell structure was confirmed by transmission electron microscopy (TEM) and element analyses, in which the diameter of Au nanoparticle (NP) is about 14 nm and the thickness of shell is about 30–50 nm, being composed of Cu2O nanoparticles. Electrochemical properties of Au@Cu2O/Nafion/GC electrode were investigated by cyclic voltammetric techniques and electrochemical impedance spectroscopy (EIS). It was found that the Au@Cu2O/Nafion/GC electrode exhibited enhanced electrocatalytic activity towards glucose oxidation in alkaline medium (pH = 12.6), as compared to those of Cu2O/Nafion/GC and Au/Nafion/GC electrodes. Some influence parameters including pH value and Au@Cu2O content on electrocatalytic activity of the modified electrode have been investigated. Under the optimized conditions, the electrochemical sensor has a linear dependence over glucose concentrations from 0.05 to 2.0 mM with a sensitivity of 715 μA mM−1 Cm−2. Moreover, such a glucose sensor demonstrated good stability, reproducibility and selectivity. Our results suggest that Au@Cu2O core-shell structure could be a promising candidate for the construction of non-enzymatic sensor.
152 citations