Preferentially-shaped PtNi/C ORR nanocatalysts - Challenges towards their integration in MEA - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Preferentially-shaped PtNi/C ORR nanocatalysts - Challenges towards their integration in MEA

Résumé

Due to strain and ligand effects, the simultaneous presence of concave and convex surfaces and their highly-defective nanostructure (atomic vacancies, grain boundaries), highly defective hollow PtNi/C electrocatalysts have proven to enhance remarkably the oxygen reduction reaction (ORR) kinetics [1,2,8,9]. Likewise, PtNi aerogel [3], jagged PtNi nanowires [4,5] feature both high concentration of structural defects and enhanced ORR activity. On the other hand, inspired from single crystal studies, nanostructured octahedral-shaped PtNi/C electrocatalysts exhibiting only Pt(111) facets are among the most active ORR electrocatalysts [6,7]. This presentation will focus on structure-activity-stability relationships of these two classes of materials. A special emphasis will be given to the comparison of their behavior in model conditions (liquid electrolyte, RDE configuration) and in more realistic ones (liquid electrolyte, GDE configuration) before addressing their integration in MEA. Finally, a comparison of the durability of this library of materials will be discussed.

Domaines

Catalyse Matériaux
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Dates et versions

hal-04206594 , version 1 (13-09-2023)

Identifiants

  • HAL Id : hal-04206594 , version 1

Citer

Camille Roiron, Raphaël Riasse, Vincent Martin, Kavita Kumar, Raphaël Chattot, et al.. Preferentially-shaped PtNi/C ORR nanocatalysts - Challenges towards their integration in MEA. 74th Annual Meeting of the International Society of Electrochemistry, International Society of Electrochemistry, Sep 2023, Lyon, France. ⟨hal-04206594⟩
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