Characterization of PEM fuel cell membrane-electrode-assemblies by electrochemical methods and microanalysis

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Characterization of Membrane Electrode Assemblies (MEAs) is used to help optimize construction of the MEA. Characterization techniques include electron microscopies (SEM and TEM), and electrochemical evaluation of the catalyst. Electrochemical hydrogen adsorption/desorption (HAD) and CO oxidation are used to evaluate the active Pt surface area of fuel cell membrane electrode assemblies. Electrochemical surface area measurements have observed large active Pt surface areas, on the order of 50 m{sup 2}/g for 20% weight Pt supported on graphite. Comparison of the hydrogen adsorption/desorption with CO oxidation indicates that on the supported catalysts, the saturation coverage of CO/Pt is about 0.90, the same ... continued below

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10 p.

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Borup, R.L. & Vanderborgh, N.E. September 1, 1995.

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Characterization of Membrane Electrode Assemblies (MEAs) is used to help optimize construction of the MEA. Characterization techniques include electron microscopies (SEM and TEM), and electrochemical evaluation of the catalyst. Electrochemical hydrogen adsorption/desorption (HAD) and CO oxidation are used to evaluate the active Pt surface area of fuel cell membrane electrode assemblies. Electrochemical surface area measurements have observed large active Pt surface areas, on the order of 50 m{sup 2}/g for 20% weight Pt supported on graphite. Comparison of the hydrogen adsorption/desorption with CO oxidation indicates that on the supported catalysts, the saturation coverage of CO/Pt is about 0.90, the same as observed in H{sub 2}SO{sub 4}. The catalyst surface area measurements are nearly a factor of 2 lower than the Pt surface area calculated from the 30 {angstrom} average particle size observed by TEM. The electrochemical measurements combined with microanalysis of membrane electrode assemblies, allow a greater understanding and optimization of process variables.

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10 p.

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OSTI as DE95016896

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  • 1. international symposium on proton conducting membrane fuel cells, Chicago, IL (United States), 8-13 Oct 1995

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  • Other: DE95016896
  • Report No.: LA-UR--95-2483
  • Report No.: CONF-9510207--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 100251
  • Archival Resource Key: ark:/67531/metadc627711

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  • September 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 29, 2016, 1:25 p.m.

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Borup, R.L. & Vanderborgh, N.E. Characterization of PEM fuel cell membrane-electrode-assemblies by electrochemical methods and microanalysis, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc627711/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.