Nafion and modified-Nafion membranes for polymer electrolyte fuel cells: An overview

Sahu, A. K.; Pitchumani, S.; Sridhar, P.; Shukla, Avanish

doi:10.1007/s12034-009-0042-8

Cited by 137 publications

(65 citation statements)

References 55 publications

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“…tightly bound by the electrostatic interactions to the sulfonic groups forming the walls of ionic channels) (Devanathan 2008, Wu 2008. The bound water region exists within 3-4 Å near the pore surface, which is roughly the size of a water molecule (Sahu et al 2009). Only slow hopping of protons between the sulfonic groups occurs in this regime, referred to as "surface diffusion mechanism."…”

Section: Mechanisms Of Proton Conduction In Nafionmentioning

confidence: 99%

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Gloukhovski

Freger

Tsur

2017

Reviews in Chemical Engineering

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Abstract Composite membranes based on porous support membranes filled with a proton-conducting polymer appear to be a promising approach to develop novel proton exchange membranes (PEMs). It allows optimization of the properties of the filler and the matrix separately, e.g. for maximal conductivity of the former and maximal physical strength of the latter. In addition, the confinement itself can alter the properties of the filling ionomer, e.g. toward higher conductivity and selectivity due to alignment and restricted swelling. This article reviews the literature on PEMs prepared by filling of submicron and nanometric size pores with Nafion and other proton-conductive polymers. PEMs based on alternating perfluorinated and non-perfluorinated polymer systems and incorporation of fillers are briefly discussed too, as they share some structure/transport relationships with the pore-filling PEMs. We also review here the background knowledge on structural and transport properties of Nafion and proton-conducting polymers in general, as well as experimental methods concerned with preparation and characterization of pore-filling membranes. Such information will be useful for preparing next-generation composite membranes, which will allow maximal utilization of beneficial characteristics of polymeric proton conductors and understanding the complicated structure/transport relationships in the pore-filling composite PEMs.

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Section: Mechanisms Of Proton Conduction In Nafionmentioning

confidence: 99%

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Gloukhovski

Freger

Tsur

2017

Reviews in Chemical Engineering

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“…ZrO 2 -Nafion composites have strong acid sites and higher bulk to surface water ratio, which is critical for higher proton conductivity and better fuel cell performance. ZrO 2 -Nafion membranes have showed better fuel cell performance at 80 °C as compared to other membranes [26].…”

Section: Modified Pfsa Membranesmentioning

confidence: 91%

Components for PEM Fuel Cells: An Overview

Maiyalagan

Pasupathi

2010

MSF

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Abstract. Fuel cells, as devices for direct conversion of the chemical energy of a fuel into electricity by electrochemical reactions, are among the key enabling technologies for the transition to a hydrogen-based economy. Among the various types of fuel cells, polymer electrolyte membrane fuel cells (PEMFCs) are considered to be at the forefront for commercialization for portable and transportation applications because of their high energy conversion efficiency and low pollutant emission. Cost and durability of PEMFCs are the two major challenges that need to be addressed to facilitate their commercialization. The properties of the membrane electrode assembly (MEA) have a direct impact on both cost and durability of a PEMFC.An overview is presented on the key components of the PEMFC MEA.. The success of the MEA and thereby PEMFC technology is believed to depend largely on two key materials: the membrane and the electro-catalyst. These two key materials are directly linked to the major challenges faced in PEMFC, namely, the performance, and cost. Concerted efforts are conducted globally for the past couple of decades to address these challenges. This chapter aims to provide the reader an overview of the major research findings to date on the key components of a PEMFC MEA.

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“…In literatures, most of the degradation researches focus on the electrical/chemical performance in terms of proton transport ability, cell voltage and current density [10,11]. In mechanical field, the nonlinear viscoelastic-viscoplastic constitutive models of the membrane are widely discussed, especially on the rate, temperature, and hydration dependence [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Discussion on the Mechanical Endurance Limit of Nafion Membrane Used in Proton Exchange Membrane Fuel Cell

Xiao

Cho

2014

Energies

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As a solution of high efficiency and clean energy, fuel cell technologies, especially proton exchange membrane fuel cell (PEMFC), have caught extensive attention. However, after decades of development, the performances of PEMFCs are far from achieving the target from the Department of Energy (DOE). Thus, further understanding of the degradation mechanism is needed to overcome this obstacle. Due to the importance of proton exchange membrane in a PEMFC, the degradation of the membrane, such as hygrothermal aging effect on its properties, are particularly necessary. In this work, a thick membrane (Nafion N117), which is always used as an ionic polymer for the PEMFCs, has been analyzed. Experimental investigation is performed for understanding the mechanical endurance of the bare membranes under different loading conditions. Tensile tests are conducted to compare the mechanical property evolution of two kinds of bare-membrane specimens including the dog-bone and the deeply double edge notched (DDEN) types. Both dog-bone and DDEN specimens were subjected to a series of degradation tests with OPEN ACCESSEnergies 2014, 7 6402 different cycling times and wide humidity ranges. The tensile tests are repeated for both kinds of specimens to assess the strain-stress relations. Furthermore, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Scanning electron microscope (SEM) observation and water absorption measurement were conducted to speculate the cause of this variation. The initial cracks along with the increasing of bound water content were speculated as the primary cause.

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Nafion and modified-Nafion membranes for polymer electrolyte fuel cells: An overview

Cited by 137 publications

References 55 publications

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Components for PEM Fuel Cells: An Overview

Experimental Investigation and Discussion on the Mechanical Endurance Limit of Nafion Membrane Used in Proton Exchange Membrane Fuel Cell

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