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- Proton_exchange_membrane abstract "A proton exchange membrane or polymer electrolyte membrane (PEMfc) is a semipermeable membrane generally made from ionomers and designed to conduct protons while being impermeable to gases such as oxygen or hydrogen. This is their essential function when incorporated into a membrane electrode assembly (MEA) of a proton exchange membrane fuel cell or of a proton exchange membrane electrolyser : separation of reactants and transport of protons.PEMs can be made from either pure polymer membranes or from composite membranes where other materials are embedded in a polymer matrix. One of the most common and commercially available PEM materials is the fluoropolymer (PFSA) Nafion, a DuPont product. While Nafion is an ionomer with a perfluorinated backbone like Teflon, there are many other structural motifs used to make ionomers for proton exchange membranes. Many use polyaromatic polymers while others use partially fluorinated polymers.Proton exchange membranes are primarily characterized by proton conductivity (σ), methanol permeability (P), and thermal stability.PEM fuel cells use a solid polymer membrane (a thin plastic film) as the electrolyte. This polymer is permeable to protons when it is saturated with water, but it does not conduct electrons.Proton exchange membrane fuel cells (PEMFC) are believed to be the best type of fuel cell as the vehicular power source to eventually replace the gasoline and diesel internal combustion engines. They are being considered for automobile applications because they typically have an operating temperature of ~80 °C and a rapid start up time. PEMFCs operate at 40–60% efficiency and can vary the output to match the demands. First used in the 1960s for the NASA Gemini program, PEMFCs are currently being developed and demonstrated for systems ranging from 1 W to 2 kW.PEMFCs contain advantages over other types of fuel cells such as solid oxide fuel cells (SOFC). PEMFCs operate at a lower temperature, are lighter, and more compact, which makes them ideal for applications such as cars.However, some disadvantages are: the ~80 °C operating temperature is too low for cogeneration like in SOFCs and that the electrolyte for PEMFCs must be water saturated. On the other hand, high temperature PEMFCs operating between 100 °C and 200 °C offer further benefits such as improved electrode kinetics, simpler water and heat management, and better tolerance to fuel impurities, leading to higher overall system efficiencies. As a result, new anhydrous proton conductors, such as protic organic ionic plastic crystals (POIPCs) and protic ionic liquids, are actively studied for the development of suitable PEMs.The fuel for the PEMFC is hydrogen and the charge carrier is the hydrogen ion (proton). At the anode, the hydrogen molecule is split into hydrogen ions (protons) and electrons. The hydrogen ions permeate across the electrolyte to the cathode while the electrons flow through an external circuit and produce electric power. Oxygen, usually in the form of air, is supplied to the cathode and combines with the electrons and the hydrogen ions to produce water. The reactions at the electrodes are as follows:Anode reaction: 2H2 → 4H+ + 4e−Cathode reaction: O2 + 4H+ + 4e− → 2H2OOverall cell reaction: 2H2 + O2 → 2H2O".
- Proton_exchange_membrane wikiPageExternalLink article.cfm?storyid=933.
- Proton_exchange_membrane wikiPageExternalLink 393.pdf.
- Proton_exchange_membrane wikiPageID "2328120".
- Proton_exchange_membrane wikiPageLength "9788".
- Proton_exchange_membrane wikiPageOutDegree "40".
- Proton_exchange_membrane wikiPageRevisionID "698732872".
- Proton_exchange_membrane wikiPageWikiLink Alkali_anion_exchange_membrane.
- Proton_exchange_membrane wikiPageWikiLink Andre_Geim.
- Proton_exchange_membrane wikiPageWikiLink Boron_nitride.
- Proton_exchange_membrane wikiPageWikiLink Category:Electrochemistry.
- Proton_exchange_membrane wikiPageWikiLink Category:Fuel_cells.
- Proton_exchange_membrane wikiPageWikiLink Category:Hydrogen_technologies.
- Proton_exchange_membrane wikiPageWikiLink Category:Membrane_technology.
- Proton_exchange_membrane wikiPageWikiLink Category:Polymers.
- Proton_exchange_membrane wikiPageWikiLink Category:Proton.
- Proton_exchange_membrane wikiPageWikiLink Composite_material.
- Proton_exchange_membrane wikiPageWikiLink Conductivity_(electrolytic).
- Proton_exchange_membrane wikiPageWikiLink DuPont.
- Proton_exchange_membrane wikiPageWikiLink Dynamic_mechanical_analysis.
- Proton_exchange_membrane wikiPageWikiLink Electrolysis_of_water.
- Proton_exchange_membrane wikiPageWikiLink Electrolyte.
- Proton_exchange_membrane wikiPageWikiLink Electroosmotic_pump.
- Proton_exchange_membrane wikiPageWikiLink Fluoropolymer.
- Proton_exchange_membrane wikiPageWikiLink Gas_diffusion_electrode.
- Proton_exchange_membrane wikiPageWikiLink Graphene.
- Proton_exchange_membrane wikiPageWikiLink Hydrogen.
- Proton_exchange_membrane wikiPageWikiLink Ionomer.
- Proton_exchange_membrane wikiPageWikiLink Isotope_electrochemistry.
- Proton_exchange_membrane wikiPageWikiLink Membrane_electrode_assembly.
- Proton_exchange_membrane wikiPageWikiLink Methanol.
- Proton_exchange_membrane wikiPageWikiLink Nafion.
- Proton_exchange_membrane wikiPageWikiLink Operating_temperature.
- Proton_exchange_membrane wikiPageWikiLink Oxygen.
- Proton_exchange_membrane wikiPageWikiLink Polymer.
- Proton_exchange_membrane wikiPageWikiLink Polymer_electrolyte_membrane_electrolysis.
- Proton_exchange_membrane wikiPageWikiLink Polytetrafluoroethylene.
- Proton_exchange_membrane wikiPageWikiLink Project_Gemini.
- Proton_exchange_membrane wikiPageWikiLink Proton_conductor.
- Proton_exchange_membrane wikiPageWikiLink Proton_exchange_membrane_fuel_cell.
- Proton_exchange_membrane wikiPageWikiLink Roll-to-roll_processing.
- Proton_exchange_membrane wikiPageWikiLink Semipermeable_membrane.
- Proton_exchange_membrane wikiPageWikiLink Solid_oxide_fuel_cell.
- Proton_exchange_membrane wikiPageWikiLink Solvay_S.A..
- Proton_exchange_membrane wikiPageWikiLink Synthetic_membrane.
- Proton_exchange_membrane wikiPageWikiLink University_of_Manchester.
- Proton_exchange_membrane wikiPageWikiLinkText "PEM".
- Proton_exchange_membrane wikiPageWikiLinkText "Proton exchange membrane".
- Proton_exchange_membrane wikiPageWikiLinkText "membranes".
- Proton_exchange_membrane wikiPageWikiLinkText "polymer electrolyte membrane".
- Proton_exchange_membrane wikiPageWikiLinkText "polymer electrolyte".
- Proton_exchange_membrane wikiPageWikiLinkText "proton exchange membrane".
- Proton_exchange_membrane wikiPageWikiLinkText "proton exchange membrane(PEM)".
- Proton_exchange_membrane wikiPageWikiLinkText "solid polymer electrolyte (SPE)".
- Proton_exchange_membrane wikiPageUsesTemplate Template:Authority_control.
- Proton_exchange_membrane wikiPageUsesTemplate Template:Colbegin.
- Proton_exchange_membrane wikiPageUsesTemplate Template:Colend.
- Proton_exchange_membrane wikiPageUsesTemplate Template:Reflist.
- Proton_exchange_membrane wikiPageUsesTemplate Template:Use_dmy_dates.
- Proton_exchange_membrane subject Category:Electrochemistry.
- Proton_exchange_membrane subject Category:Fuel_cells.
- Proton_exchange_membrane subject Category:Hydrogen_technologies.
- Proton_exchange_membrane subject Category:Membrane_technology.
- Proton_exchange_membrane subject Category:Polymers.
- Proton_exchange_membrane subject Category:Proton.
- Proton_exchange_membrane hypernym Membrane.
- Proton_exchange_membrane type AnatomicalStructure.
- Proton_exchange_membrane type Cell.
- Proton_exchange_membrane type Polymer.
- Proton_exchange_membrane type Process.
- Proton_exchange_membrane type Redirect.
- Proton_exchange_membrane type Substance.
- Proton_exchange_membrane type Technology.
- Proton_exchange_membrane type Thing.
- Proton_exchange_membrane comment "A proton exchange membrane or polymer electrolyte membrane (PEMfc) is a semipermeable membrane generally made from ionomers and designed to conduct protons while being impermeable to gases such as oxygen or hydrogen.".
- Proton_exchange_membrane label "Proton exchange membrane".
- Proton_exchange_membrane sameAs Q911500.
- Proton_exchange_membrane sameAs Protonen-Austausch-Membran.
- Proton_exchange_membrane sameAs Membrane_échangeuse_de_protons.
- Proton_exchange_membrane sameAs Membrana_a_scambio_protonico.
- Proton_exchange_membrane sameAs イオン交換膜.
- Proton_exchange_membrane sameAs m.07431s.
- Proton_exchange_membrane sameAs Membrană_de_schimb_protonic.
- Proton_exchange_membrane sameAs Q911500.
- Proton_exchange_membrane wasDerivedFrom Proton_exchange_membrane?oldid=698732872.
- Proton_exchange_membrane isPrimaryTopicOf Proton_exchange_membrane.