Plasma driven exsolution for nanoscale functionalization of perovskite oxides

Vasileios Kyriakou, Rakesh Kumar Sharma, Dragos Neagu, Floran Peeters, Oreste De Luca, Petra Rudolf, Arunkumar Pandiyan, Wonjong Yu, Suk Won Cha, Stefan Welzel, Mauritius C.M. van de Sanden, Mihalis N. Tsampas

Research output: Contribution to journalArticlepeer-review

Abstract

Perovskite oxides with dispersed nanoparticles on their surface are considered instrumental in energy conversion and catalytic processes. Redox exsolution is an alternative method to the conventional deposition techniques for directly growing well-dispersed and anchored nanoarchitectures from the oxide support through thermochemical or electrochemical reduction. Herein, a new method for such nanoparticle nucleation through the exposure of the host perovskite to plasma is shown. The applicability of this new method is demonstrated by performing catalytic tests for CO2 hydrogenation over Ni exsolved nanoparticles prepared by either plasma or conventional H2 reduction. Compared to the conventional thermochemical H2 reduction, there are plasma conditions that lead to the exsolution of a more than ten times higher Ni amount from a lanthanum titanate perovskite, which is similar to the reported values of the electrochemical method. Unlike the electrochemical method, however, plasma does not require the integration of the material in an electrochemical cell, and is thus applicable to a wide range of microstructures and physical forms. Additionally, when N2 plasma is employed, the nitrogen species are stripping out oxygen from the perovskite lattice, generating a key chemical intermediate, such as NO, rendering this technology even more appealing.
Original languageEnglish
Article number2100868
Number of pages7
JournalSmall Methods
Volume5
Issue number12
Early online date22 Oct 2021
DOIs
Publication statusPublished - 15 Dec 2021

Keywords

  • exsolution
  • metal nanoparticles
  • nanostructuring
  • perovskites
  • plasma

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