Effects of Curing Temperature and Pressure on the Mechanical Properties of Gasket Material Used for Polymer Electrolyte Membrane Fuel Cells

2019 ◽  
Vol 795 ◽  
pp. 93-101
Author(s):  
Ri Dong He ◽  
Zhi Qiang Wang ◽  
Jin Zhu Tan ◽  
Li Yin ◽  
Zeng Hui Liu
Keyword(s):  
Mechanical Properties ◽  
Fuel Cells ◽  
Silicone Rubber ◽  
Polymer Electrolyte Membrane ◽  
Pem Fuel Cells ◽  
Curing Temperature ◽  
Compression Stress ◽  
Rubber Material ◽  
Gasket Material ◽  
Curing Pressure

The long-term mechanical stability of the gasket material is critical to sealing and electrochemical performance of the polymer electrolyte membrane (PEM) fuel cells. In this paper, the silicone rubber material, which is being considered as gasket material for PEM fuel cells, was fabricated at different curing temperatures and different curing pressures. Effects of the curing temperatures and curing pressures on the mechanical properties of the silicone rubber material were investigated. The tensile test results show that tensile strength of the specimen cured at the curing temperature of 160 was larger than that for the specimens cured at the curing temperature of 150 or 170 under the same curing pressure. The test results of the compression stress-strain, compression set and compression stress relaxation show that the curing temperature and curing pressure affected significantly the compression elastic modulus, compression set rate and compression stress relaxation behavior. It is found that the silicone rubber material cured at the curing temperature of 160 under the curing pressure of 10MPa had good compression mechanical properties compared to the materials cured at the other curing temperatures and curing pressure in this work.

Fluoroplastic- and Bio-Based Composites Materials for PEM Fuel Cells Bipolar Plates

2021 ◽  
Vol 899 ◽  
pp. 192-201
Author(s):  
Nikita Faddeev ◽  
Denis Tokarev ◽  
Tatyana A. Molodtsova ◽  
Maxim Belichenko ◽  
Victor Klushin
Keyword(s):  
Mechanical Properties ◽  
Fuel Cells ◽  
Plant Biomass ◽  
Polymer Electrolyte Membrane ◽  
Conductive Polymer ◽  
Conductive Filler ◽  
Pem Fuel Cells ◽  
Bipolar Plates ◽  
Colloidal Graphite ◽  
Electrolyte Membrane

Conductive polymer composite materials for polymer electrolyte membrane fuel cells bipolar plates have been successfully prepared from renewable plant biomass sources and copolymers of tetrafluoroethylene with vinylidenefluoride. The composites are based on various conductive fillers (natural, oxidized and colloidal graphite’s) and polymer binder (the 5-HMF synthesis by-product or fluoroplastic). The influences of type and content of binder and type of conductive filler on the mechanical properties and conductivity were investigated. Conductivity of the composites decreases with increasing of polymer content, but its mechanical properties changes inversely. Composite based on 5-HMF by-products (content 30 wt.%) and colloidal graphite as a filler meets the DOE requirements for a mechanical strength. Flexural and compressive strengths were 25 and 32 MPa, respectively. Composites based on fluoroplastic 32 (content 30 wt.%) and fluoroplastic 42 (content 20 wt.%) with colloidal graphite as a filler and fluoroplastic 42 (content 20 wt.%) with nature graphite have flexural strength values close to the target value of DOE and amounted to 24, 17 and 19 MPa, respectively. Interfacial contact resistance depends to a greater extent on the nature of the filler and is maximum for composites based on natural graphite. Composites based on fluoroplastic 42 at any filler content correspond to the requirements DOE ≤ 0.01 ohm∙cm2. Composite based on 5-HMF synthesis by-product (resin) and fluoroplastic with conductive filler (colloidal graphite) shows a great potential application as bipolar plates for PEMFCs.

scholarly journals Correlating high temperature thin film ionomer electrode binder properties to hydrogen pump polarization

2021 ◽  
Author(s):  
Gokul Venugopalan ◽  
Deepra Bhattacharya ◽  
Subarna Kole ◽  
Cameron Ysidron ◽  
Polyxeni P. Angelopoulou ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
High Temperature ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Pem Fuel Cells ◽  
Profound Impact ◽  
Electrolyte Membrane ◽  
Electrode Binder ◽  
Hydrogen Pump

Ionomer electrode binders are important materials for polymer electrolyte membrane (PEM) fuel cells and electrolyzers and have a profound impact on cell performance. Herein, we report the effect of two...

Contamination and moisture absorption effects on the mechanical properties of catalyst coated membranes in PEM fuel cells

2012 ◽  
Vol 37 (8) ◽  
pp. 6790-6797 ◽  
Author(s):  
Ruiliang Jia ◽  
Siming Dong ◽  
Takuya Hasegawa ◽  
Jiping Ye ◽  
Reinhold H. Dauskardt
Keyword(s):  
Mechanical Properties ◽  
Fuel Cells ◽  
Moisture Absorption ◽  
Pem Fuel Cells ◽  
Coated Membranes

scholarly journals Propane Fuel Cells: Selectivity for Partial or Complete Reaction

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Shadi Vafaeyan ◽  
Alain St-Amant ◽  
Marten Ternan
Keyword(s):  
Fuel Cells ◽  
Density Functional ◽  
Catalyst Surface ◽  
Polymer Electrolyte Membrane ◽  
Platinum Group Metal ◽  
Pem Fuel Cells ◽  
Metal Catalyst ◽  
Boltzmann Factor ◽  
Functional Theory ◽  
Electrolyte Membrane

The use of propane fuel in high temperature (120°C) polymer electrolyte membrane (PEM) fuel cells that do not require a platinum group metal catalyst is being investigated in our laboratory. Density functional theory (DFT) was used to determine propane adsorption energies, desorption energies, and transition state energies for both dehydrogenation and hydroxylation reactions on a Ni(100) anode catalyst surface. The Boltzmann factor for the hydroxylation of a propyl species to form propanol and its subsequent desorption was compared to that for the dehydrogenation of a propyl species. The large ratio of the respective Boltzmann factors indicated that the formation of a completely reacted product (carbon dioxide) is much more likely than the formation of partially reacted products (alcohols, aldehydes, carboxylic acids, and carbon monoxide). That finding is evidence for the major proportion of the chemical energy of the propane fuel being converted to either electrical or thermal energy in the fuel cell rather than remaining unused when partially reacted species are formed.

Effects of Geometrical Parameters on Improving the Transversal Mass Transport in PEM Fuel Cells

2006 ◽  
Author(s):  
Yanxia Zhao ◽  
Renwei Mei ◽  
James F. Klausner
Keyword(s):  
Fuel Cells ◽  
Flow Rate ◽  
Fluid Transport ◽  
Polymer Electrolyte Membrane ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Flow Channel ◽  
Geometrical Parameters ◽  
Electrolyte Membrane ◽  
Transversal Flow

A computational model using Lattice Boltzmann Equation (LBE) method is employed to investigate the fluid transport on the anode side of Polymer Electrolyte Membrane (PEM) fuel cells, with an emphasis on mass transfer enhancement. A 3-dimensional LBE code is developed to solve the flows in the channel and the porous media in the gas diffusion layer (GDL) simultaneously. Multiple flow enhancers (obstructions in the flow channel) are placed in the channel to enhance the transversal flow across the GDL. The mass flow rate, the velocity field and the pressure distribution are analyzed. The effects of flow enhancers are assessed. The results show that the transversal flow across the GDL is enhanced by placing flow enhancers in the channel. Increasing flow enhancer size can significantly increase the transversal flow rate, with high pressure-loss through the flow channel. The results also demonstrate that the location of flow enhancers in the flow channel have a remarkable impact on the transversal flow rate. The transversal flow rate increases as the GDL porosity increases.

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