Evidence and model for strain-driven release of metal nanocatalysts from perovskites during exsolution

Tae Sik Oh, Ehsan K. Rahani, Dragos Neagu, John T.S. Irvine, Vivek B. Shenoy, Raymond J. Gorte, John M. Vohs

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

The evolution of the surface morphology during exsolution of Ni from the perovskite La0.4Sr0.4Ti0.97Ni0.03O3-δ under reducing conditions was determined using atomic force microscopy. The exsolution process was found to initially induce the formation of a 20-30 nm deep pit on the oxide surface followed by the emergence of a Ni particle at the bottom of the pit. Continued emergence of the particle results in it nearly filling the pit, producing a unique structure in which the Ni particle is socketed into the oxide surface. We also show that this morphological evolution can be explained using a simple energy-based model that accounts for the interplay between the surface free energy and the strain energy induced by the included metal nucleate. The unique socketed structure results in strong anchorage between the exsolved particles and the oxide host lattice, which imparts both high thermal stability and unique catalytic activity.

Original languageEnglish
Pages (from-to)5106-5110
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume6
Issue number24
DOIs
Publication statusPublished - 7 Dec 2015
Externally publishedYes

Keywords

  • atomic force microscopy
  • metal exsolution
  • perovskite
  • strain

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