Is Nafion a plastic?

Nafion is a brand of the Chemours company. It is the first of a class of synthetic polymers with ionic properties that are called ionomers. … Nafion.

Identifiers
ChemSpider none
PubChem CID 61889 monomer
CompTox Dashboard ( EPA ) DTXSID30882013
Properties

What is Nafion membrane made of?

Nafion membranes are composed mainly of a polytetrafluoroethylene (PTFE) backbone with side chains containing ether groups and a sulfonic acid unit at its end. Modifications with conducting polymers, such as polyaniline, are studied to reduce the methanol crossover in direct methanol fuel cell applications.

What is Nafion membrane where is it used?

Nafion is a polymer electrolyte membrane material giving polymer electrolyte membrane fuel cells (PEMFC)s, their name. It is undoubtly the most successful and widely-used polymeric proton conductor for low-temperature fuel cells (Mauritz and Moore, 2004).

Is Nafion toxic?

The perfluorosulfonic acid copolymers used in Nafion membranes exhibit very low acute toxicity when administered in oral doses to rats. The LD50s are greater than 20,000 mg/kg of body weight.

What is a proton exchange membrane made of?

A proton-exchange membrane, or polymer-electrolyte membrane (PEM), is a semipermeable membrane generally made from ionomers and designed to conduct protons while acting as an electronic insulator and reactant barrier, e.g. to oxygen and hydrogen gas.

Is Nafion expensive?

The current state-of-the-art membrane, NAFION is too expensive, lacks selectivity, permitting leakage between anode and cathode electrolyte compartments.

Is Nafion an ion exchange membrane?

These membranes are proton-conductive polymer film, also known as electrolyte or ionomer, that allow only protons to cross-over (cation exchange membrane), the key function of Nafion proton exchange membrane fuel cells and water electrolyzers.

Is Nafion membrane porous?

In practically all applications Nafion membranes are used as dense, non-porous flat sheet membranes with smooth surfaces.

How do you make Nafion solution?

Prepare a mixture containing 80-85 mL of ethyl alcohol and 20-15 mL of water. Keep on adding the above mixture solution in 5 wt% Nafion 117 solution till the total volume of diluted Nafion 117 solution becomes appxo. 20 times the original volume . It will be 0.25 wt% Nafion solution.

How does a Nafion membrane work?

Nafion polymer functions as an ion exchange resin when exposed to solutions. … The sulfonic acid groups form ionic channels through the bulk hydrophobic polymer, and water is very readily transported through these channels. Nafion polymer functions like a very selective, semi-permeable membrane to water vapor.

What is Nafion tubing?

Nafion tubing is a highly selective, semi-permeable membrane to water vapor. … In normal use, a portion of Nafion tubing is used as a portion of the tube between a gas sample stream and a sensor. If the sample stream is much wetter than ambient air (such as breath samples), the sample falls to ambient humidity.

What is Nafion dryer?

Nafion dryers are built with a tubing of semi-permeable membrane separating an inter- nal sample gas stream from a counterflow purge gas stream contained within a stainless steel outer shell. If the partial pressure of water vapor is lower in the purge gas stream, then water is removed from the sample gas stream.

Is Nafion biocompatible?

In summary, Nafion is suitable for use in biomedical applications that require biocompatibility with a reduced possibility of post-operative infections.

Does Nafion dissolve in water?

The density of Nafion changes with sample history and solvent environment, and this can significantly impact the assessment of permeability measurements. From the data in Table 2, recast films are soluble in ethanol/ water mixtures, but even a minimal amount of heating imparts insolubility in ethanol/water.

What does Nafion 117 mean?

Nafion perfluorinated membrane (Nafion 117) is a composite material that can be used as an electrolytic ion-exchange membrane for the fabrication of fuel cells. … Nafion is a perfluorinated ion-exchange membrane which has a wide variety of commercial uses.

Which material is used for membrane of PEM fuel cell?

3.1 Membrane Normally for PEM fuel cells which operate at temperatures below 100 C, sulfonated polymers such as Nafion are the most used material. The sulfonated polymers are comprised of perfluorinated back-bones and sulfonated side-chains.

What is a PEM fuel cell made of?

PEM fuel cells are low temperature fuel cells that use a solid polymer in the form of a solid phase proton conducting membrane as an electrolyte which eliminate the need to contain corrosive liquids.

What are the four main parts of a PEM?

The membrane, catalyst layers (anode and cathode), and diffusion media together form the membrane electrode assembly (MEA) of a PEM fuel cell.

What is equivalent weight of Nafion?

The equivalent weight (EW) of Nafion is determined by the average distance between the side chains along the backbone, and is defined as the number of grams of dry polymer per mole SO 3.

Who invented Nafion?

Nafion was invented by Walther Grot in the late 1960s(1) and first commercialized as a membrane separator for chlor-alkali cells.

How do you store Nafion?

Since the membrane is stored in a sealed container, any gases being evolved will accumulate within the packaging. Higher heat and light may contribute to higher release of such gases. Hence the advice given to store the nation membranes away from direct sunlight.

Is Nafion conductive?

Nafion membranes have high proton conductivity, mechanical and chemical stability in its hydrated state and lower temperature, which make them a promising fuel cell electrolyte for transport, portable and stationary application [1, 2].

Is Nafion hydrophilic or hydrophobic?

Infact, Nafion membrane itself is inhomogenous in nature, having hydrophobic and hydrophilic domains. It is the hydrophilic domains that absorb water and swells whereas the hydrophobic domains not.

How do you activate the Nafion membrane?

Based on those publication and previous studies, a specific acid treatment was performed in order to activate the membrane and increase the amount of water molecules per sulfonic group [5] Currently, sulfuric acid (H2SO4) with concentration below 1 M is used in standard method for the activation of Nafion [6].

How do you make a polymer electrolyte membrane?

Stir the salt+acetonitrile solution overnight. 3) Mix the two (polymer slurry and salt+acetonitrile solution according to your desired salt concentration in the final membrane) and stir them over another 5~8 hours. At this step you should stir the liquid decently slow to avoid trapping gas bubbles in the slurry.

How do you make a cation exchange membrane?

Homogeneous ion-exchange membranes can be prepared by polymerization of monomers that contain a moiety that either is or can be made anionic or cationic, or by polymerization of a monomer that contains an anionic or a cationic moiety, or by introduction of anionic or cationic moieties into a polymer dissolved in a …

How do you make a PEM fuel cell?