Is Nafion electrically conductive? The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: It is highly conductive to cations, making it suitable for many membrane applications. It resists
Is Nafion electrically conductive?
The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: It is highly conductive to cations, making it suitable for many membrane applications. It resists chemical attack.
Is Nafion an electrolyte?
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).
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].
Is Nafion soluble 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.
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. This causes uneven dimensional changes which leads to wrinkling.
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.
What is a Nafion 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. …
How do you cut Nafion membranes?
a knife, razor or scissors. Cutting before pretreatment generally may be preferred because dry membranes are easier to handle than wet ones in the cutting operation. dimensions may change as a result of changes in relative humidity.
How do you clean a Nafion membrane?
Nafion is often cleaned before testing by boiling in peroxide to remove organics, acid to ensure full conversion to proton form, and water to remove acid introduced in the prior step.
Is Nafion soluble in acetone?
Nafion is sulfonated teflon (PTFE) which is practically insoluble in commonly used solvents. However, Perfluorocarbon Solvents can be used to dissolve nafion as per the attached article.
Is Nafion membrane porous?
In practically all applications Nafion membranes are used as dense, non-porous flat sheet membranes with smooth surfaces.