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Communication Dans Un Congrès Année : 2022

Structural disorder in ORR electrocatalysis: operation mode, practical descriptors to quantify and foreseen challenges

Raphaël Chattot
Camille Roiron
  • Fonction : Auteur
  • PersonId : 1157082
Pierre Bordet
Laetitia Dubau

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]. Likewise, PtNi aerogel [3], jagged PtNi nanowires [4,5] feature both high concentration of structural defects and enhanced ORR activity. On the other hand, and inspired from single crystal approach, nanostructured octahedral-shaped PtNi/C electrocatalysts exhibiting only Pt(111) facets are among the most active ORR electrocatalysts [6,7]. This presentation will show how structure-activity-stability relationships of these two classes of materials can be unified via two descriptors derived from structural and electrochemical parameters respectively [8,9]. A special emphasis will be given on the stability trends of these two families of ORR electrocatalysts.

Domaines

Catalyse
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Dates et versions

hal-03779777 , version 1 (19-09-2022)

Identifiants

  • HAL Id : hal-03779777 , version 1

Citer

Raphaël Chattot, Clément Atlan, Arnaud Viola, Corentin Chatelier, Isaac Martens, et al.. Structural disorder in ORR electrocatalysis: operation mode, practical descriptors to quantify and foreseen challenges. 2022 Fuel Cell (GRS) - Conference on Fuel Cells : From Fundamental Electrochemistry to Engineering Applied Materials, Jul 2022, Smithfield (RI), United States. ⟨hal-03779777⟩
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