On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Agate Martin
  • Patrick Trinke
  • Chuyen van Pham
  • Melanie Bühler
  • Markus Bierling
  • Peter K.R. Holzapfel
  • Boris Bensmann
  • Simon Thiele
  • Richard Hanke-Rauschenbach

Externe Organisationen

  • Forschungszentrum Jülich
  • Albert-Ludwigs-Universität Freiburg
  • Hahn-Schickard-Gesellschaft für angewandte Forschung e.V.
  • Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU Erlangen-Nürnberg)
  • Technische Universität Berlin
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Details

OriginalspracheEnglisch
Aufsatznummer114513
FachzeitschriftJournal of the Electrochemical Society
Jahrgang168
Ausgabenummer11
PublikationsstatusVeröffentlicht - 22 Nov. 2021

Abstract

Altogether five platinum group metal (PGM) and PGM-free cathode catalysts were investigated in full PEM water electrolysis cells regarding their polarisation behaviour and their hydrogen and oxygen recombination properties. It was shown that the recombination activity of permeated oxygen and evolved hydrogen within the cathodic catalyst layer correlates with the activity of the oxygen reduction reaction (ORR) which was determined ex situ with linear sweep voltammetry. We found that the investigated PGM-free cathode catalysts had a low activity for the ORR resulting in higher measurable oxygen in hydrogen volume fractions compared to the PGM catalysts, which are more active for the ORR. Out of the three investigated PGM-free catalysts, only one commercially available material based on a Ti suboxide showed a similar good polarisation behaviour as the state of the art cathode catalyst platinum, while its recombination activity was the lowest of all catalysts. In addition to the recombination of hydrogen and oxygen on the electrocatalysts, we found that the prevalent carbon-based cathodic porous transport layers (PTL) also offer catalytically active recombination sites. In comparison to an inactive PTL, the measurable oxygen flux using carbon-based PTLs was lower and the recombination was enhanced by microporous coatings with high surface areas.

ASJC Scopus Sachgebiete

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On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis. / Martin, Agate; Trinke, Patrick; van Pham, Chuyen et al.
in: Journal of the Electrochemical Society, Jahrgang 168, Nr. 11, 114513, 22.11.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Martin A, Trinke P, van Pham C, Bühler M, Bierling M, Holzapfel PKR et al. On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis. Journal of the Electrochemical Society. 2021 Nov 22;168(11):114513. doi: 10.1149/1945-7111/ac38f6
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title = "On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis",
abstract = "Altogether five platinum group metal (PGM) and PGM-free cathode catalysts were investigated in full PEM water electrolysis cells regarding their polarisation behaviour and their hydrogen and oxygen recombination properties. It was shown that the recombination activity of permeated oxygen and evolved hydrogen within the cathodic catalyst layer correlates with the activity of the oxygen reduction reaction (ORR) which was determined ex situ with linear sweep voltammetry. We found that the investigated PGM-free cathode catalysts had a low activity for the ORR resulting in higher measurable oxygen in hydrogen volume fractions compared to the PGM catalysts, which are more active for the ORR. Out of the three investigated PGM-free catalysts, only one commercially available material based on a Ti suboxide showed a similar good polarisation behaviour as the state of the art cathode catalyst platinum, while its recombination activity was the lowest of all catalysts. In addition to the recombination of hydrogen and oxygen on the electrocatalysts, we found that the prevalent carbon-based cathodic porous transport layers (PTL) also offer catalytically active recombination sites. In comparison to an inactive PTL, the measurable oxygen flux using carbon-based PTLs was lower and the recombination was enhanced by microporous coatings with high surface areas.",
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T1 - On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis

AU - Martin, Agate

AU - Trinke, Patrick

AU - van Pham, Chuyen

AU - Bühler, Melanie

AU - Bierling, Markus

AU - Holzapfel, Peter K.R.

AU - Bensmann, Boris

AU - Thiele, Simon

AU - Hanke-Rauschenbach, Richard

N1 - Funding Information: The authors gratefully acknowledge the financial support by the Federal Ministry of Education and Research of Germany in the framework of PowerMEE (BMBF/03SF0536).

PY - 2021/11/22

Y1 - 2021/11/22

N2 - Altogether five platinum group metal (PGM) and PGM-free cathode catalysts were investigated in full PEM water electrolysis cells regarding their polarisation behaviour and their hydrogen and oxygen recombination properties. It was shown that the recombination activity of permeated oxygen and evolved hydrogen within the cathodic catalyst layer correlates with the activity of the oxygen reduction reaction (ORR) which was determined ex situ with linear sweep voltammetry. We found that the investigated PGM-free cathode catalysts had a low activity for the ORR resulting in higher measurable oxygen in hydrogen volume fractions compared to the PGM catalysts, which are more active for the ORR. Out of the three investigated PGM-free catalysts, only one commercially available material based on a Ti suboxide showed a similar good polarisation behaviour as the state of the art cathode catalyst platinum, while its recombination activity was the lowest of all catalysts. In addition to the recombination of hydrogen and oxygen on the electrocatalysts, we found that the prevalent carbon-based cathodic porous transport layers (PTL) also offer catalytically active recombination sites. In comparison to an inactive PTL, the measurable oxygen flux using carbon-based PTLs was lower and the recombination was enhanced by microporous coatings with high surface areas.

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