Polyvinylidene fluoride/poly(ethylene terephthalate) conductive composites for proton exchange membrane fuel cell bipolar plates: Crystallization, structure, and through-plane electrical resistivity

2012 ◽  
Vol 52 (12) ◽  
pp. 2552-2558 ◽  
Author(s):  
Jianbin Song ◽  
Frej Mighri ◽  
Abdellah Ajji ◽  
Chunhua Lu
Keyword(s):  
Polyvinylidene Fluoride ◽  
Proton Exchange Membrane ◽  
Ethylene Terephthalate ◽  
Proton Exchange ◽  
Bipolar Plates ◽  
Conductive Composites ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Exchange Membrane ◽  
Crystallization Structure

Development of Polymer-Based Materials for Proton Exchange Membrane Fuel Cell Bipolar Plates: Ways to Increase Through-Plane Electrical Conductivity and to Decrease Gas Permeability

2009 ◽  
Author(s):  
Frej Mighri ◽  
Luc Nguyen
Keyword(s):  
Fuel Cell ◽  
Polyvinylidene Fluoride ◽  
Proton Exchange Membrane ◽  
Gas Permeability ◽  
Research Work ◽  
Extrusion Process ◽  
High Specific Surface Area ◽  
Proton Exchange ◽  
Bipolar Plates ◽  
Exchange Membrane

This research work aimed at developing, by twinscrew extrusion process, electrically conductive sheets for proton exchange membrane fuel cell (PEMFC) bipolar plates. For this, a series of highly conductive blends were carefully formulated from a co-continuous mixture of polythylene terephthalate (PET)/polyvinylidene fluoride (PVDF) and high specific surface area carbon black (CB) and graphite (GR) conductive additives. Several major factors, such as CB/GR content, PVDF/PET composition and morphology, and also PET crystallinity were shown to have remarkable effects on these three main properties.

Development and Characterization of Conductive Materials for PEMFC Bipolar Plates

2010 ◽  
Author(s):  
Frej Mighri ◽  
Luc Nguyen ◽  
Said Elkoun
Keyword(s):  
Polyvinylidene Fluoride ◽  
Proton Exchange Membrane ◽  
Amorphous Region ◽  
Proton Exchange ◽  
Bipolar Plates ◽  
Twin Screw Extrusion ◽  
Slow Cooling ◽  
Conductive Materials ◽  
Twin Screw ◽  
Exchange Membrane

The aim of this work was to develop and characterize electrically conductive bipolar plates (BPPs) used in proton exchange membrane fuel cells (PEMFCs). These BPPs were made from highly conductive blends of polyethylene terephthalate (PET) and polyvinylidene fluoride (PVDF), as matrix phase. The conductive materials were developed from carefully formulated blends composed of conductive carbon black powder (CB) mixed with pure PET, PVDF, or with PVDF/PET systems. They were first developed by twin screw extrusion (TSE) process then compression molded to give BPP final shape. Focus was made on the effect of crystallization of PVDF and PET polymers on the electrical through-plane resistivity of BPPs. It was observed that lower resistivity was obtained with PVDF/CB blends due to the higher interfacial energy between the PVDF matrix and CB and also the higher density and crystallinity of PVDF, compared to those of PET. For the different systems studied, slow cooling rates helped to attain the lowest values of through-plane resistivity since higher PET crystallinity led to smaller amorphous region in which CB was more concentrated. In addition, BPPs made from (PVDF/PET)/CB blends led to lower through-plane resistivity when the PVDF/PET phase had a co-continuous morphology. This is mainly due to the selective localization of the CB in the PET phase leading to a denser conductive carbon network. The lowest through-plane resistivity was around 0.3 Ohm.cm obtained with a (50/50 PVDF/PET)/CB filled with 30 wt% CB.

Electrochemical Characteristic of Cr-Based Film Coated 304SS as PEMFC Bipolar Plates

2010 ◽  
Vol 160-162 ◽  
pp. 1469-1475
Author(s):  
Nai Bao Huang ◽  
Cheng Hao Liang ◽  
Guo Qiang Lin ◽  
Li Shuang Xu ◽  
Bao Lian Li
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Electrochemical Techniques ◽  
Proton Exchange ◽  
304 Stainless Steel ◽  
Electrochemical Characteristic ◽  
Bipolar Plates ◽  
Cathodic Arc Deposition ◽  
Cr Film ◽  
Exchange Membrane

By using electrochemical techniques, the electrochemical characteristic of Cr-based film coated 304 stainless steel (304SS) as proton exchange membrane fuel cell (PEMFC) bipolar plates, which was deposited by cathodic arc deposition technology, was studied. The results indicated that Cr, CrN, (TiCr)N and (TiN+Ti) film could not only decreased the steel’s contact resistance but also improved its corrosion resistance and the fuel cell stack’s performance. Since Cr, (CrN) and (TiCrN) film were more compact than (TiN+Ti) film, which contained the oxides of Ti, as bipolar plates, the performance for all film change in the following order: Cr film ≈(CrN) film ≈ (TiCrN) film >(TiN+Ti) film.

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