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Rapid Plasma Exsolution from an A-site Deficient Perovskite Oxide at Room Temperature

Lookup NU author(s): Professor Ian Metcalfe, Dr Evangelos Papaioannou



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2022 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH.High-performance nanoparticle platforms can drive catalysis progress to new horizons, delivering environmental and energy targets. Nanoparticle exsolution offers unprecedented opportunities that are limited by current demanding process conditions. Unraveling new exsolution pathways, particularly at low-temperatures, represents an important milestone that will enable improved sustainable synthetic route, more control of catalysis microstructure as well as new application opportunities. Herein it is demonstrated that plasma direct exsolution at room temperature represents just such a step change in the synthesis. Moreover, the factors that most affect the exsolution process are identified. It is shown that the surface defects produced initiate exsolution under a brief ion bombardment of an argon low-pressure and low-temperature plasma. This results in controlled nanoparticles with diameters ≈19–22 nm with very high number densities thus creating a highly active catalytic material for CO oxidation which rivals traditionally created exsolved samples.

Publication metadata

Author(s): Khalid H, Haq AU, Alessi B, Wu J, Savaniu CD, Kousi K, Metcalfe IS, Parker SC, Irvine JTS, Maguire P, Papaioannou EI, Mariotti D

Publication type: Article

Publication status: Published

Journal: Advanced Energy Materials

Year: 2022

Volume: 12

Issue: 45

Print publication date: 01/12/2022

Online publication date: 03/10/2022

Acceptance date: 02/04/2018

Date deposited: 15/03/2023

ISSN (print): 1614-6832

ISSN (electronic): 1614-6840

Publisher: John Wiley and Sons Inc


DOI: 10.1002/aenm.202201131


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