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Activity and Durability of Platinum-Based Electrocatalysts with Tin Oxide–Coated Carbon Aerogel Materials as Catalyst Supports

Authors
  • Labbé, Fabien1
  • Asset, Tristan2
  • Chatenet, Marian1, 2, 3, 4
  • Ahmad, Yasser5, 6, 7
  • Guérin, Katia5, 6
  • Metkemeijer, Rudolf1
  • Berthon-Fabry, Sandrine1
  • 1 PSL University, MINES ParisTech, PERSEE-Centre procédés, énergies renouvelables et systèmes énergétiques, CS 10207 rue Claude Daunesse, Sophia Antipolis Cedex, 06904, France , Sophia Antipolis Cedex (France)
  • 2 Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes) LEPMI, Grenoble, 38000, France , Grenoble (France)
  • 3 University of Savoie Mont Blanc, LEPMI, Chambéry, 73000, France , Chambéry (France)
  • 4 French University Institute, Paris, France , Paris (France)
  • 5 Clermont Université, ICCF, Clermont-Ferrand, F-63000, France , Clermont-Ferrand (France)
  • 6 CNRS, ICCF, UMR 6296, Aubière, F-63171, France , Aubière (France)
  • 7 Fahad Bin Sultan University, P. O Box 15700, Tabuk, 71454, Kingdom of Saudi Arabia , Tabuk (Saudi Arabia)
Type
Published Article
Journal
Electrocatalysis
Publisher
Springer US
Publication Date
Jan 15, 2019
Volume
10
Issue
2
Pages
156–172
Identifiers
DOI: 10.1007/s12678-018-0505-z
Source
Springer Nature
Keywords
License
Yellow

Abstract

Platinum nanoparticles were deposited onto carbon aerogel with three different tin coatings. The coatings were synthesized at pH = 0.7 or 11.5 and with various masses of SnCl2.H2O precursor: 1, 2, and 10 g. The nanoparticles dispersion was found dependent on the morphological properties of the support, i.e., its specific surface, porosity, and coverage by tin oxide. The material electrochemical activity for the oxygen reduction reaction (ORR) and stability was investigated: two accelerated stress tests (ASTs), mimicking either a base-load cycle procedure (P1) or a start-stop procedure (P2), were performed at T = 80 °C. The sample coated at pH = 0.7 and the sample with the lowest loading, deposited at pH = 11.5, exhibited interesting performances, both in term of stability (under P1) and activity. On the contrary, samples with highly covering tin oxide coating displayed unsatisfactory initial performances, owing to the low electrical conductivity of their catalytic support. In any case, the aging under P2 leads in a dramatic decrease of the electrocatalyst activity. This either resulted from (i) the low degree of organization of the carbon aerogel, the latter being prone to harsh corrosion when non-covered by the tin oxide, or (ii) by the chemical changes undergone by the tin oxide during the AST, leading to the formation of an amorphous, low electrical conductivity support. Graphical Abstract

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