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 paper, novel amphoteric ion exchange membranes (AIEMs) are prepared using sulfonated poly(ether ether ketone) (SPEEK) and quaternized poly (ether imide) (QAPEI) by a facile method.
Abstract: For vanadium redox flow battery (VRB) applications, novel amphoteric ion exchange membranes (AIEMs) are prepared using sulfonated poly(ether ether ketone) (SPEEK) and quaternized poly(ether imide) (QAPEI) by a facile method. Different from other AIEMs synthesized by multiple steps, SPEEK/QAPEI (S/Q) membranes are directly prepared by blending. It offers a reduction in cost and leads to a high degree of micro-phase separated structure which could facilitate ion transport. The mechanical properties, thermal stability and oxidative stability of S/Q blend membranes are examined. In addition, increasing the content of QAPEI in the blend membranes could reduce water uptake and vanadium ion permeability effectively and improve the proton selectivity. In VRB single cell tests, the VRBs with S/Q blend membranes show higher coulombic efficiency and energy efficiency (EE) than pristine SPEEK and Nafion 115 membranes. Furthermore, the blend membranes present stable performance up to 100 cycles without significant decline in EE. All experimental results indicate that the S/Q blend membranes show promising prospects for VRB applications.
88 citations
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TL;DR: In this paper, a simple method by which the electronic resistance of a thin layer of carbon/Pt/Nafion fuel-cell electrode composite material may he measured by de polarization and then combined with ac impedance measurements to compute the ionic resistance of the layer.
Abstract: Rational design of electrode materials for polymer electrolyte fuel cells requires a knowledge of how changes in material composition affect basic physical characteristics such as charge-transport properties We present a simple method by which the electronic resistance of a thin layer of carbon/Pt/Nafion fuel-cell electrode composite material may he measured by de polarization and then combined with ac impedance measurements to compute the ionic resistance of the layer Further support of this technique is derived from an ac impedance test designed to simultaneously express both the measured electronic and the computed ionic resistance We also demonstrate the use of the technique in a composition-dependence study, namely, examination of the effect of glycerol on the ionic and electronic resistances in a thin catalyst layer
88 citations
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TL;DR: In this article, the electrochemical behavior of glucose at Pt electrodes was investigated in alkaline solutions using cyclic voltammetry and the modulated potential-time waveform (MPTW) technique.
88 citations
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TL;DR: In this paper, the effect of M x O y nanopowders on the thermal, mechanical and electrical properties of [Nafion/(M xO y ) n ] membranes with thicknesses ranging from 170 to 350μm were studied.
88 citations
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TL;DR: The chemical stability tests of the novel composite PEMs by Fenton's reagent demonstrate the significant improvement in the chemical durability and the Nafion/PTFE composite Pems show an excellent physical stability.
Abstract: A novel method has been proposed to fabricate Nafion/poly(tetrafluoroethylene) (PTFE) composite proton exchange membranes (PEMs) with high durability and high chemical stability. In this method, Na...
88 citations