hydrophobic gas-diffusion media for polymer

Extremely Hydrophobic POPs to Access Highly Porous

Eddaoudi and co-workers implemented the molecular-building-block strategy to isolate three porous organic polymers (POPs), namely KPOP-1, KPOP-2, and KPOP-3 (KPOP = KAUST's POP), exhibiting high surface areas. Impressively, the methane uptake of KPOP-2 at 298 K and 80 bar is 0.515 g g−1, surpassing the gravimetric 2012 Department of Energy target for onboard CH4 storage. Interestingly,

US Patent for Gas diffusion electrode for membrane fuel

A porous gas diffusion electrode for membrane fuel cells on an ion-conducting polymer. The electrode contains a finely divided electrocatalyst which is dispersed in a proton-conducting ionomer and has a total porosity of more than 40 to less than 75%. It supplies

Optimization of Perfluoropolyether

Downloadable! A hydrophobic perfluoropolyether (PFPE)-based polymer, namely Fluorolink P56, was studied instead of the commonly used polytetrafluoroethylene (PTFE), in order to enhance gas diffusion media (GDM) water management behavior, on the basis

Hydrophobic effect

The hydrophobic effect is the observed tendency of nonpolar substances to aggregate in an aqueous solution and exclude water molecules. [1] [2] The word hydrophobic literally means water-fearing, and it describes the segregation of water and nonpolar substances, which maximizes hydrogen bonding between molecules of water and minimizes the area of contact between water and nonpolar molecules.

[PDF] Chapter 46 Diffusion media materials and

Polymer electrolyte fuel cell (PEFC) stacks usually employ bipolar plates with channels on either side for the distribution of reactants over the electrode surfaces. Figure 1 shows the cross-section of a small section from such a PEFC. At the center of the structure is a 50 μm membrane coated by two 15 μm catalyst layers on either side. Surrounding this, two roughly 200 μm thick carbon

Wettability and capillary behavior of fibrous gas diffusion

2009/10/20The relationship of capillary pressure to liquid saturation for the water–air fluid pair in two different types of gas diffusion media (GDM) used in polymer electrolyte membrane fuel cell (PEMFC) electrodes is elucidated. It is experimentally demonstrated that GDM

Influence of hydrophobic treatment on the structure of compressed gas diffusion

Keywords: gas diffusion layer, synchrotron tomography, compression, hydrophobic treatment, water transport 1. Introduction The gas diffusion layer (GDL) is a key component for the liquid water and gas transport in polymer membrane fuel cells (PEFCs) [1-4]. It

Interaction of synthetic and lignin

PVA polymer is used vastly in textile, papermaking, coating industry, 3D printing, optical gas and humidity sensors, emission sensors for vehicles and oral drug delivery, and solar cells. 3–7 PVA, by having a linear structure, 2 has been functionalized with anionic

Concepts in Biophysical Chemistry – Notes

These notes cover the physical chemistry governing molecular behavior in biological systems. It is meant as a resource for those that want to educate themselves or others in biophysics for chemists. DOWNLOAD 1. Thermodynamics and Biomolecular Reactions 2.

Development of experimental techniques for studying gas

Polymer Electrolyte Membrane (PEM) fuel cells, which produces electricity by oxidation of hydrogen and reduction of oxygen with water as the only waste product, have shown great potential as a zero-emission and high-efficiency source of energy. Despite the numerous advantages of the fuel cell, its performance must still be improved significantly. Numerous studies have identified water

Impact of the microporous layer on gas diffusion layers

We tested different types of hydrophobic GDMs: A commercial GDM, a GDM with highly porous microporous layer (MPL) and other with crack-free MPL and contrasted them to modified GDM. The modified materials consists on gas diffusion layers (GDL) with patterns of hydrophilic and hydrophobic regions and with different crack-free MPLs.

PTFE mapping in gas diffusion media for PEMFCs using

PTFE mapping in gas diffusion media for PEMFCs using fluorescence microscopy Nicholas McCarthy a, Rui Chen a,*, Gregory Offer b, Robert Thring a a Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, LE11 3TU, UK

Effect of gas diffusion layer properties on water distribution across air

1 Effect of gas diffusion layer properties on water distribution across air-cooled, open-cathode polymer electrolyte fuel cells: a combination of ex-situ X-ray tomography and in-situ neutron imaging. Quentin Meyer1, Sean Ashton2, Pierre Boillat3,4, Magali Cochet3, Erik Engebretsen1,

Polymer Properties Database

Usually, the molecular diffusion through the polymer membrane is the slowest and, thus, the rate-determining step in the permeation process. Diffusion can be described with Fick's Law (1855). It states that at a steady state, the flux going through a unit area of

New Porous Carbon Materials as Gas Diffusion Layer for Polymer

simulation of porous media,9–13 but very few are reported on new GDL materials.14–16 In this work, new porous carbon sheets are proposed, which are to be used as GDL in anodes and cathodes of polymer electrolyte fuel cells (PEFCs). So far only a few 17

ENGINEERED INTERFACIAL AND STRUCTURAL POROUS MEDIA ARCHITECTURE FOR POLYMER ELECTROLYTE FUEL

The gas-phase transport and performance of cracked CL was compared to a standard CL. Based on insights gained from the cracked CL investigation, the diffusion media were modified using laser treatment. Perforations were introduced via lasers on

Gas Diffusion Layer: Characteristics and Modeling

Many treatments exist for the gas diffusion layer. Most of these treatments are used to make the diffusion media hydrophobic to avoid flooding in the fuel cell. Either the anode or the cathode diffusion media, or both, can be PTFE treated. The diffusion material is

On the hydrophobicity and hydrophilicity of the

as an extension for hydrophobic media. Although there are alternative forms for p c [9,10], equation appears to be the only one that contains the wetting angle explicitly; consequently, allowing it to vary in a model may give an indication of how the degree of hydrophobicity, or polytetrafluoroethylene (PTFE) content, of a GDL affects, for example, the performance of the cell.

Advanced control of liquid water region in diffusion

Abstract In the present study, a three-dimension (3-D) model of polymer electrolyte fuel cells (PEFCs) is employed to investigate the complex, non-isothermal, two-phase flow in the gas diffusion layer (GDL). Wang, Yun, and Chen, Ken S. Advanced control of liquid water region in diffusion media of polymer electrolyte fuel cells through a dimensionless number.

Performance Evaluation and Mechanism Study of a Silicone

Performance Evaluation and Mechanism Study of a Silicone Hydrophobic Polymer for Improving Gas Reservoir Permeability By Jie Zhang, Xu-Yang Yao, Bao-Jun Bai and Wang Ren Submitted: October 8th 2019 Reviewed: December 10th 2019 DOI: 10.5772

Catalyst Coated Membrane (CCM) with a Microporous

Generally, an MPL is formed on the gas diffusion layer (GDL) substrate for water management. However, in M-CCM method, a hydrophilic MPL is attached to the cathode catalyst layer. If the CCM with an MPL attached (M-CCM) is used instead of a standard CCM using the decal method, the MEA performance will still improve even when using conventional GDLs with a hydrophobic MPL.

US Patent Application for Gas diffusion electrode and

A gas diffusion electrode for a PEM fuel cell includes a metallic catalyst, and an electrocatalyst layer having a polymer A for hydrophobicizing the electrocatalyst layer and a uniform thickness of between 3 to 40 μm, especially 25 μm. The polymer A content is less

Hydrophobic salt

This polymer scaffold should keep the enzymes stable and allow for the facile diffusion of molecules and ions in and out of the matrix. Most polymers used for this type of immobilization are based on polyamines or polyalcohols - polymers that mimic the natural environment of the enzymes that they encapsulate and stabilize the enzyme through hydrogen or ionic bonding.

Gas transport properties in waterborne polymer

2014/11/1Gas transport measurements were conducted in a permeation cell, (4) where the permeability, P, the diffusion coefficient, D, and the solubility coefficient, S, of the coating were measured. The cell has two compartments separated by the nanocomposite membrane.

Effect of Thickness and Hydrophobic Polymer Content of

The effect of thickness and wetproof level of the gas diffusion layer on electrode flooding and cell performance was investigated. Three types of gas diffusion media were tested: SGL SIGRACET carbon papers, with and without a microporous layer, and Toray TGPH carbon paper without a microporous layer. Overall, it was found that SGL carbon paper with the microporous layer gave the best fuel cell

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