PFSA membrane for vanadium batteries and water electrolysis

Catalog Number

ACMA00045092

Description

Perfluorinated ion exchange membrane-M10H is a single component perfluorosulfonic acid H-type ion membrane produced by tape casting. As a solid electrolyte separating cathode and anode in various electrolytic cells and batteries, the membrane has the property of cation unidirectional passage. Because PTFE is used as the main chain to adjust the most suitable molecular weight and ion exchange capacity, the membrane has the characteristics of chemical resistance and durability.PFSA-M10H membrane is widely used in: vanadium batteries, liquid flow batteries, fuel cells, hydrogen production by water electrolysis and other fields.

Storage

Prior to opening the original shipping box, the membrane does not require environmentally controlled storage. Membrane should be kept sealed in its original packaging until needed. After opening the package, store the material in a temperature and humidity controlled environment(temperature 25.0±5.0°C and humidity 45±5.0%RH). Acclimatize the membrane to the manufacturing environment for at least 48 hours prior to use.
Once opened and exposed to the environment, the membrane will equilibrate to the ambient relative humidity, and change in dimensions accordingly.

Appendix

PFSA membrane for vanadium batteries and water electrolysis
Items	PFSA-M10H-50	PFSA-M10H-60	PFSA-M10H-70	PFSA-M10H-80	PFSA-M10H-100	PFSA-M10H-120	PFSA-M10H-180	PFSA-M10H-250
Thickness and Basis Weight Properties
Thickness(microns)	51	64	76	89	102	127	183	254
Weight(g/cm2)	100	125	150	176	200	250	360	500
Pysical Properties Measured at 50% RH, 23℃
Transverse Tensile Strength, MPa	36
Longitudinal tensile strength, MPa	38
Elongation at Break, %	186
Density,g/cm3	1.98
Chemical Properties
Water Content, % water (50% RH, 23°C)	5%
Water Uptake, % water (50% RH, 100°C,1h)	50%
Thickness expansion, % increase
from 50% RH, 23 °C to water soaked, 23 °C	10%
from 50% RH, 23 °C to water soaked, 100 °C	15%
Linear expansion, % increase
from 50% RH, 23 °C to water soaked, 23 °C	10%
from 50% RH, 23 °C to water soaked, 100 °C	15%
Conductivity(at 100% RH, 23 °C), S/cm	0.1
Acid Capacity, meq/g	0.1

Packaging

The standard product specifications for membrane pieces include:
Width: 0.20m(max.)
Length: 0.20m(min)-5.0m(max.)
The membrane for cut pieces will depend on the size and quantity of the customers' order requirements. All the flatted membranes are shipped on a roll. Flat membranes are directly wound into a small roll. The membranes are protected with a polyethylene wrap and inner packaging, then placed in shipping hard cartons.
The standard product specifications for membrane rolls include:
Width: 200mm and 600mm standard widths; other widths are available from 200mm to 400mm in 100mm increments on special order.
Length: 100-meter standard roll length, other non-standard lengths are feasible to meet orders of the customer.
There is a 50m2 minimum order requirement for non standard roll widths and lengths. Membrane pieces or rolls can be cut to non standard sizes, and special packaging provided at additional cost. Please contact our sales staff for details and availability.
Membrane dimensions are based on dry product conditioned at 23°C and 50% relative humidity(RH) before cutting. The moisture content of the membranes will have an influence on their size changes including in the length, width, and thickness directions. Once the coversheet is removed, the membrane will adjust to the environment conditions. The membrane typically adheres to the coversheet, to the extent that it reduces the dimensions.

Case Study

Improvement of Highly Ordered Ultrathin PFSA Ionomer Membrane for Vanadium Batteries

Kim, Jongmin Q., et al. ACS Energy Letters, 2020, 6(1), 184-192.

Perfluorosulfonic acid (PFSA) ionomer membranes are essential components in vanadium redox flow batteries (VRFBs) for facilitating the transport of ions through hydrophilic channels. To address the problem of low proton/vanadium ion selectivity caused by randomly interconnected ion channels in PFSA membranes, this work developed an ultrathin PFSA membrane with highly aligned ion channels and reduced size. This improved PFSA membrane has ordered ion channels and its ion selectivity is improved by 500 times.
Preparation procedure of molecularly controlled ultrathin PFSA membranes
· Formation of the PFSA monolayer at the air/water interface involves the preparation of ultrathin PFSA membranes on a porous support by condensing the PFSA monolayer on the air/water interface using a Langmuir trough. A total of 50 µL of 5 wt% D520 dispersion was used in separate addition steps to create a homogeneous monolayer. The monolayer was compressed at a speed of 27 mm/min to a surface pressure of 54 mN/m, followed by decompression at the same rate, repeated five times to obtain a compactly condensed PFSA monolayer.
· Deposition of the PFSA monolayers on the substrate includes transferring the PFSA monolayers from the air/water interface to the substrate using the Langmuir-Blodgett method with a dipper speed of 5 mm/min under a surface pressure of 54 mN/m. Si wafers treated with OTS were used as substrates for multilayer characterizations. After deposition, the samples were dried at 80 °C for 16 hours to form the final ultrathin PFSA membrane on the substrate.

Preparation of Porous PFSA Membrane and Its Application in Alkaline Water Electrolysis

Aili, David, et al. Journal of Membrane Science, 2015, 493, 589-598.

Polyperfluorosulfonic acid (PFSA) has excellent alkali resistance and is highly hydrophilic due to its sulfonic acid groups. In this work, PFSA membranes with extended porous structures were prepared to study their performance improvement in alkaline water electrolysis. The results show that the ionic conductivity of the modified PFSA membrane in KOH aqueous solution is improved from 0.01 S cm-1 to 0.2 S cm-1.
Preparation procedure of porous PFSA membrane
· The PFSA dispersion was gradually mixed with 100 g portions of a 0.6 mol L1 aqueous solution of KOH until reaching a neutral pH. The mixture was then combined and underwent evaporation of the solvent at 80 °C under vacuum, resulting in the formation of the white residue of the K+ salt of the PFSA ionomer (24.95 g).
· This K+ salt was dissolved in N,N-dimethylacetamide (DMAc, 357 g) to form a solution with a solid content of 6.53 wt%. Various amounts of Poly(vinylpyrrolidone) (PVP) were added to different portions of the K+-PFSA solution to achieve PVP:K+-PFSA ratios of 0~60 wt%.
· Extra DMAc was included in the PVP:K+-PFSA mixtures to maintain the solid content at 6.5 wt%. Transparent and colorless blend membranes of PVP and K+-PFSA were then cast on Petri dishes through solvent evaporation by gradually heating from room temperature to 120 °C and subsequently kept at 120 °C for 4 h in a ventilated oven under ambient atmosphere.
· The membranes obtained were peeled off in demineralized water and further treated in demineralized water at 90 °C for a minimum of 2 h.

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