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Investigation of cathode catalyst layer interfaces evolution during accelerated stress tests for polymer electrolyte fuel cells.

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Title: Investigation of cathode catalyst layer interfaces evolution during accelerated stress tests for polymer electrolyte fuel cells.
Authors: Perego, Andrea1,2 (AUTHOR) aperego@uci.edu, Avid, Arezoo1,2 (AUTHOR), Mamania, Divija N.1,2 (AUTHOR), Chen, Yechuan1 (AUTHOR), Atanassov, Plamen1 (AUTHOR), Yildirim, Hakan3 (AUTHOR), Odgaard, Madeleine3 (AUTHOR), Zenyuk, Iryna V.1,2 (AUTHOR) iryna.zenyuk@uci.edu
Source: Applied Catalysis B: Environment & Energy. Feb2022, Vol. 301, pN.PAG-N.PAG. 1p.
Subjects: Proton exchange membrane fuel cells, Accelerated life testing, Polymer testing, X-ray photoelectron spectroscopy, Catalysts, Platinum electrodes
Abstract: To elucidate the evolution of ionomer-Pt and ionomer-carbon interfaces during life cycle of polymer electrolyte fuel cells (PEFCs), electrodes with high surface area (HSA) and durable carbon supports underwent catalyst and carbon corrosion accelerated stress tests (ASTs) under stoichiometric and sub-stoichiometric gas flow conditions. Electrochemical characterizations, as well as X-ray photoelectron spectroscopy (XPS) were utilized to assess degree of components degradation. Catalyst AST results revealed that Pt nanoparticles dispersed within the micro- and meso-pores and not in contact with ionomer are the main contributor to the 50% electrochemical surface area (ECSA) loss observed after 30k cycles resulting in significant polarization loss, which is much more notable in the case of sub-stoichiometric operating condition. Support AST results for HSA carbon showed severe ionomer degradation and 55% ECSA loss within the first 100 cycles, while cell with durable support exhibited negligible polarization and ECSA decay during the first 2500 cycles attributed to higher ionomer coverage, preservation of proton pathways preventing Pt from detachment. [Display omitted] • Interfaces evolution are evaluated during accelerated stress tests (ASTs) for fuel cells. • Pt that is not in contact with ionomer degrades the most for catalyst AST. • Ionomer degradation is observed for all ASTs. • Graphitized carbon supports mitigate corrosion and Pt loss. [ABSTRACT FROM AUTHOR]
Copyright of Applied Catalysis B: Environment & Energy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 153237997
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Investigation of cathode catalyst layer interfaces evolution during accelerated stress tests for polymer electrolyte fuel cells.
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  Data: <searchLink fieldCode="AR" term="%22Perego%2C+Andrea%22">Perego, Andrea</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> aperego@uci.edu</i><br /><searchLink fieldCode="AR" term="%22Avid%2C+Arezoo%22">Avid, Arezoo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mamania%2C+Divija+N%2E%22">Mamania, Divija N.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Yechuan%22">Chen, Yechuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Atanassov%2C+Plamen%22">Atanassov, Plamen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yildirim%2C+Hakan%22">Yildirim, Hakan</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Odgaard%2C+Madeleine%22">Odgaard, Madeleine</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zenyuk%2C+Iryna+V%2E%22">Zenyuk, Iryna V.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> iryna.zenyuk@uci.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+B%3A+Environment+%26+Energy%22">Applied Catalysis B: Environment & Energy</searchLink>. Feb2022, Vol. 301, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Proton+exchange+membrane+fuel+cells%22">Proton exchange membrane fuel cells</searchLink><br /><searchLink fieldCode="DE" term="%22Accelerated+life+testing%22">Accelerated life testing</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+testing%22">Polymer testing</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+photoelectron+spectroscopy%22">X-ray photoelectron spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Platinum+electrodes%22">Platinum electrodes</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: To elucidate the evolution of ionomer-Pt and ionomer-carbon interfaces during life cycle of polymer electrolyte fuel cells (PEFCs), electrodes with high surface area (HSA) and durable carbon supports underwent catalyst and carbon corrosion accelerated stress tests (ASTs) under stoichiometric and sub-stoichiometric gas flow conditions. Electrochemical characterizations, as well as X-ray photoelectron spectroscopy (XPS) were utilized to assess degree of components degradation. Catalyst AST results revealed that Pt nanoparticles dispersed within the micro- and meso-pores and not in contact with ionomer are the main contributor to the 50% electrochemical surface area (ECSA) loss observed after 30k cycles resulting in significant polarization loss, which is much more notable in the case of sub-stoichiometric operating condition. Support AST results for HSA carbon showed severe ionomer degradation and 55% ECSA loss within the first 100 cycles, while cell with durable support exhibited negligible polarization and ECSA decay during the first 2500 cycles attributed to higher ionomer coverage, preservation of proton pathways preventing Pt from detachment. [Display omitted] • Interfaces evolution are evaluated during accelerated stress tests (ASTs) for fuel cells. • Pt that is not in contact with ionomer degrades the most for catalyst AST. • Ionomer degradation is observed for all ASTs. • Graphitized carbon supports mitigate corrosion and Pt loss. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Catalysis B: Environment & Energy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.apcatb.2021.120810
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
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      – SubjectFull: Proton exchange membrane fuel cells
        Type: general
      – SubjectFull: Accelerated life testing
        Type: general
      – SubjectFull: Polymer testing
        Type: general
      – SubjectFull: X-ray photoelectron spectroscopy
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Platinum electrodes
        Type: general
    Titles:
      – TitleFull: Investigation of cathode catalyst layer interfaces evolution during accelerated stress tests for polymer electrolyte fuel cells.
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            – D: 01
              M: 02
              Text: Feb2022
              Type: published
              Y: 2022
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