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Optimizing catalyst loading in non-noble metal electrocatalyst layer to improve oxygen reduction reaction activity

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/j.elecom.2011.02.017
AuteurRechercher : 1; Rechercher : 1Identifiant ORCID : https://orcid.org/0000-0002-1823-2948; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut d'innovation en piles à combustible du CNRC
FormatTexte, Article
SujetCatalyst layers; Catalyst loadings; Electrocatalyst layers; Electrode catalysts; Electrode surfaces; Electron transfer; Electron transfer pathways; Heat treatment process; Noble metals; Non-noble metal catalysts; Oxygen reduction reaction; Oxygen reduction reaction (ORR); PEM fuel cell; Rotating disk electrodes; Rotating ring-disk electrode techniques; Saturation point; Electrocatalysts; Electrolytic reduction; Electron transitions; Loading; Metals; Optimization; Oxygen; Precious metals; Proton exchange membrane fuel cells (PEMFC); Rotating disks; Rotation; Catalyst activity
Résumé
Carbon-supported non-noble metal catalysts with Fe as the metal and tripyridyl triazine (TPTZ) as the ligand (Fe-TPTZ/C), synthesized through a heat treatment process at 900 °C, were employed to coat an electrode surface and form catalyst layers in order to optimize their catalyzed ORR activity. The formed catalyst layers containing different catalyst loads of 100, 200, 300, 400, 500, and 600 μg•cm-2 were tested using both rotating disk electrode and rotating ring disk electrode techniques. It was found that as the electrode catalyst loading increased, the ORR activity rose monotonically in the loading range of 100 to 500 μg•cm-2, then reached a saturation point with higher catalyst loading, indicating that raising the electrode catalyst loading could effectively improve the catalyst's ORR activity. In addition, the overall ORR electron transfer numbers for Fe-N x/C catalysts were found to be in the range of 3.7-3.9 at different loadings, suggesting that the ORR process was mainly dominated by a four-electron transfer pathway to produce water. © 2010 Elsevier B.V.
Date de publication
Maison d’éditionElsevier
Dans
  • Electrochemistry Communications 13, nº 5 (mai 2011) : 447–449.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21271416
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Identificateur de l’enregistrement906e41ab-1be3-4215-a57c-a1e49918d914
Enregistrement créé2014-03-24
Enregistrement modifié2021-08-13
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