Non-platinum cathode catalyst layer composition for single Membrane Electrode Assembly Proton Exchange Membrane Fuel Cell
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Nafion
Membrane electrode assembly
Fuel of proton exchange membrane fuel cell(PEMFC) mostly comes from reformate contains CO which will poison the fuel cell electrocatalyst.The effect of CO on the performance of PEMFC was studied in this paper.The results of the experiment show that when CO is fed in PEMFC,the cell voltage will be decreased violently,then it will become steady with some vibration.The poison will become more serious with higher CO content and weaker at higher temperature.The adsorption of CO on the electrocatalyst is reversible. The PtRu electrocatalyst is more suitable for the electrocatalysis of CO/H 2 than Pt electrocatalyst.
CO poisoning
Catalytic reforming
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Bipolar plate for Proton Exchange Membrane (PEM) fuel cell was fabricated with various materials and characterized by different techniques. Two types of gas flow fields, serpentine & parallel, were designed for bipolar plates and their effect on the functioning of fuel cells was investigated. Pressure drop between the two designs, at inlet and outlet of gases was different and its effect was reported. In the fabrication process of membrane electrode assemblies (MEA), the platinum catalyst was synthesized in the laboratory and this catalyst was deposited on the Nafion membrane with the help of ionomer emulsion. Then gas diffusion layers were placed on both sides of the membrane. Different MEAs versions (imported and indigenous) were assembled and tested in the fuel cells and their efficiency was evaluated in terms of current, voltage and power. A fuel cell test stand was developed to operate and test the working of single cell and fuel cell stack is also described. Polarization curves were drawn to evaluate the performance of fuel cells. These studies are directed at the development of different fuel cell components which are tested under the same conditions for comparison.
Membrane electrode assembly
Nafion
Ionomer
Gaseous diffusion
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Fuel of proton exchange membrane fuel cell(PEMFC) mostly comes from reformate contains CO which will poison the fuel cell electrocatalyst.The effect of CO on the performance of PEMFC was studied in this paper.The results of the experiment show that when CO is fed in PEMFC,the cell voltage will be decreased violently,then it will become steady with some vibration.The poison will become more serious with higher CO content and weaker at higher temperature.The adsorption of CO on the electrocatalyst is reversible. The PtRu electrocatalyst is more suitable for the electrocatalysis of CO/H 2 than Pt electrocatalyst.
CO poisoning
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Nafion
Membrane electrode assembly
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Membrane electrode assembly
Gaseous diffusion
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An extended and reliable lifetime of high temperature proton exchange membrane fuel cells is inevitable for the commercialization of this technology in the near future. Therefore, components of the high temperature-proton exchange membrane fuel cell (HT-PEMFC), such as the bipolar plates (BPPs) and the membrane electrode assembly (MEA), are investigated regarding degradation phenomena during constant cell operation with use of contaminated air in the cathode feed. µ-computed tomography (µ-CT) is applied to visualize morphological changes due to this operation and to analyse each component individually on the micro meter scale. The thickness of each MEA layer is determined and correlated to results from electrochemical measurements. Furthermore the open porosity of the bipolar plates is determined and compared to phosphoric acid retention of the cell.
Membrane electrode assembly
Degradation
Phosphoric acid
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Nafion
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Abstract Membrane electrode assemblies (MEAs), based on commercial catalyst‐coated membranes combined with various gas diffusion layers (GDLs) on anode and cathode, were studied in terms of their specific advantages for different operations regimes of proton exchange membrane fuel cells (PEMFCs.) It is verified that MEAs with optimized gas diffusion layer designs (backing and micro‐porous layers) on anode and cathode are able to provide improved cell performance combined with a largely reduced sensitivity towards changes in the relative humidity as compared to MEAs with symmetrical gas diffusion layer configuration.
Membrane electrode assembly
Gaseous diffusion
Diffusion layer
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In this study, we prepare membrane electrode assembly(MEA). Using Nafion-212 proton exchange membrane (PEM) and containing Pt-C (Pt deposited on carbon powder support; with 40 wt% Pt content) and chloroplatinic acid catalyst solution. Three different structures of MEAs are prepared including: (1) five layer MEA in which a PEM is located in the middle with two Pt-C catalyst layer being attached on both outside surfaces of the PEM and two gas diffusion layers (GDLs) attaching on the outside surfaces of Pt-C layers; (2) seven layer MEA in which PEM is in the middle of the whole structure with two Pt-C layers on both outside surfaces of the PEM, and two H2PtCl6 reduced Pt particle layers on the outside surfaces of Pt-C layers. We find that the seven layer MEA with total Pt loadings of 0.2 mg/cm2 at anode and 0.4 mg/cm2 at cathode has a best fuel cell performance.
Chloroplatinic acid
Nafion
Membrane electrode assembly
Particle (ecology)
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Proton exchange memb rane fuel cell has been considered one of the next generation power source for electric vehicles due to high power density and low emissions. TiO₂/Nafion composite was prepared by the in-situ sol-gel method. The electrochemical characteristics of the TiO₂-Nafion composite membrane were evaluated by current-voltage and impedance of the membrane eletrode assembly in a single Proton exchange membrane fuel cell (PEMFC).
Nafion
Power density
Open-circuit voltage
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