Talk: Unifying ORR structure/activity/stability relationships of shape-controlled and highly defective PtNi/C electrocatalysts

Talk by Laetitia DUBAU

Chargé de Recherche CNRS
Laboratoire d’Electrochimie et de Physico Chimie des Matériaux et des Interfaces (LEPMI)

Abstract:

Unifying ORR structure/activity/stability relationships of shapecontrolled
and highly defective PtNi/C electrocatalysts

Raphaël Chattot 1, 2, 6 , Olivier Le Bacq 3 , Pierre Bordet 4,5 ,Jakub Drnec 6,
Frédéric Maillard 1, 2 and Laetitia Dubau 1, 2
1 Univ. Grenoble Alpes, LEPMI, F-38000 Grenoble, France
2 CNRS, LEPMI, F-38000 Grenoble, France
3 Univ. Grenoble Alpes, CNRS, Grenoble INP , SIMAP, 38000 Grenoble, France
4Université Grenoble Alpes, Institut Néel, F-38000 Grenoble, France
5CNRS, Institut Néel, F-38000 Grenoble, France
6 European Synchrotron Radiation Facility, ID 31 Beamline, BP 220, F-38043 Grenoble Cedex, France

 

Due to strain and ligand effects, the simultaneous presence of concave and convex surfaces and their highlydefective
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 this two
classes of materials can be unified via a unique descriptor, the Surface Distorsion, derived from a physical
parameter, the microstrain obtained from X-ray diffraction patterns.
 
[1] L. Dubau, T. Asset, C. Bonnaud, R. Chattot, V. van Peene, F. Maillard, ACS Catal., 5 (2015) 5333-
5341.
[2] L. Dubau, J. Nelayah, S. Moldovan, O. Ersen, P. Bordet, J. Drnec, T. Asset, R. Chattot, F. Maillard,
ACS Catal., 6 (2016) 4673-4684.
[3] Henning, S., Schmidt, T. J. et al. J. Electrochem. Soc. 163 (2016) F998–F1003.
[4] Li, M. Huang, Y. et al. Science (80-. ). 354 (2016) 1414–1419.
[5] Alia, S. M., Pylypenko, S., Pivovar, B. S. et al. ACS Omega, 2 (4) (2017) 1408–1418.
[6] Cui, C., Gan, L., Heggen, M., Rudi, S. & Strasser, P. Nat. Mater. 12, (2013) 765–71.
[7] Chen, C., Stamenkovic, V. R. et al. Science 343 (2014) 1339-1343.

 

Tidspunkt

ons 27 jun 18
10:00

Arrangør

DTU Fysik

Hvor

DTU Lyngby Campus
Bygning 311
Lounge/1. sal