Encyclopedia of Sustainability Science and Technology

Living Edition
| Editors: Robert A. Meyers

Proton Exchange Membrane Fuel Cells: High-Temperature, Low-Humidity Operation

Living reference work entry
DOI: https://doi.org/10.1007/978-1-4939-2493-6_155-3


Three-phase boundary

Region in the electrode where protons from the ionomer, electrons from the electrically conducting Pt and/or carbon, and reactant gases meet.

Electrolyte membrane

A solid polymer ion-conducting membrane used in the center of the fuel cell membrane electrode assembly. Fuel cell electrocatalyst A catalyst that catalyzes either the oxidation of the fuel or the reduction of oxygen in a fuel cell.

Equivalent weight

A measure of the acid content of an ionomer in the units of grams of polymer per mole of acid. Gas diffusion layer A carbon paper or cloth used as a current collector in fuel cells that can allow the passage of reactant gases and product water to and from the electrodes.

Hydrogen oxidation reaction (HOR)

Electrochemical oxidation of H2 at the anode.


A copolymer of an ion-containing monomer and a nonionic monomer, typically not soluble in water. Membrane electrode assembly (MEA) An ion-conducting membrane sandwiched between two electrodes, an...

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Authors and Affiliations

  1. 1.3M Fuel Cell Components Program3M CompanySt PaulUSA
  2. 2.Department of Chemical and Biological EngineeringColorado School of MinesGoldenUSA

Section editors and affiliations

  • Adam Z. Weber
    • 1
  1. 1.Lawrence Berkeley National LaboratoryBerkeleyUSA