<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>26434</id>
    <completedYear/>
    <publishedYear>2012</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>7757</pageFirst>
    <pageLast>7761</pageLast>
    <pageNumber/>
    <edition/>
    <issue>9</issue>
    <volume>37</volume>
    <type>article</type>
    <publisherName>Elsevier</publisherName>
    <publisherPlace>Oxford</publisherPlace>
    <creatingCorporation>International Association for Hydrogen Energy</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Visualization of the water distribution in perforated gas diffusion layers by means of synchrotron X-ray radiography</title>
    <abstract language="eng">Perforated gas diffusion layers (GDLs) of polymer electrolyte membrane fuel cells (PEMFCs) were investigated by means of in-situ synchrotron X-ray radiography during operation. We found a strong influence of perforations on the water distribution and transport in the investigated Toray TGP-H-090 GDL. The water occurs mainly around the perforations, while the holes themselves show varying water distributions. Some remain dry, while most of them fill up with liquid water after a certain period or might serve as drainage volume for effective water transport.</abstract>
    <parentTitle language="eng">International journal of hydrogen energy</parentTitle>
    <identifier type="old">29201</identifier>
    <identifier type="doi">10.1016/j.ijhydene.2012.01.141</identifier>
    <identifier type="issn">0360-3199</identifier>
    <enrichment key="date_peer_review">10.09.2012</enrichment>
    <author>Henning Markötter</author>
    <author>R. Alink</author>
    <author>J. Haußmann</author>
    <author>K. Dittmann</author>
    <author>Tobias Arlt</author>
    <author>F. Wieder</author>
    <author>C. Tötzke</author>
    <author>M. Klages</author>
    <author>C. Reiter</author>
    <author>Heinrich Riesemeier</author>
    <author>J. Scholta</author>
    <author>D. Gerteisen</author>
    <author>J. Banhart</author>
    <author>I. Manke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Polymer electrolyte membrane fuel cell (PEMFC)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Radiography</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Synchrotron</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray imaging</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Perforated gas diffusion layer (GDL)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Water transport</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>29979</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>123</pageFirst>
    <pageLast>131</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>253</volume>
    <type>article</type>
    <publisherName>Elsevier</publisherName>
    <publisherPlace>Amsterdam [u.a.]</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Three-dimensional study of compressed gas diffusion layers using synchrotron X-ray imaging</title>
    <abstract language="eng">We present a synchrotron X-ray tomographic study on the morphology of carbon fiber-based gas diffusion layer (GDL) material under compression. A dedicated compression device is used to provide well-defined compression conditions. A flat compression punch is employed to study the fiber geometry at different degrees of compression. Transport relevant geometrical parameters such as porosity, pore size and tortuosity distributions are calculated. The geometric properties notably change upon compression which has direct impact on transport conditions for gas and fluid flow. The availability of broad 3D paths, which are most important for the transport of liquid water from the catalyst layer through the GDL, is markedly reduced after compression. In a second experiment, we study the influence of the channel-land-pattern of the flow-field on shape and microstructure of the GDL. A flow-field compression punch is employed to reproduce the inhomogeneous compression conditions found during fuel cell assembly. While homogenously compressed underneath the land the GDL is much less and inhomogeneously compressed under the channel. The GDL material extends far into the channel volume where it can considerably influence gas and fluid flow. Loose fiber endings penetrate deeply into the channel and form obstacles for the discharge of liquid water droplets.</abstract>
    <parentTitle language="eng">Journal of power sources</parentTitle>
    <identifier type="old">32918</identifier>
    <identifier type="doi">10.1016/j.jpowsour.2013.12.062</identifier>
    <identifier type="issn">0378-7753</identifier>
    <enrichment key="date_peer_review">16.01.2014</enrichment>
    <author>C. Tötzke</author>
    <author>G. Gaiselmann</author>
    <author>M. Osenberg</author>
    <author>J. Bohner</author>
    <author>Tobias Arlt</author>
    <author>Henning Markötter</author>
    <author>A. Hilger</author>
    <author>F. Wieder</author>
    <author>Andreas Kupsch</author>
    <author>Bernd R. Müller</author>
    <author>Manfred P. Hentschel</author>
    <author>J. Banhart</author>
    <author>V. Schmidt</author>
    <author>W. Lehnert</author>
    <author>I. Manke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Synchrotron X-ray tomography</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Gas diffusion layer (GDL)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microstructure</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Water transport path</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pore size analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Geometrical tortuosity</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
</export-example>
