Room-Temperature Synthesis of High-Entropy Perovskite Oxide Nanoparticle Catalysts through Ultrasonication-Based Method

Francis Okejiri; Zihao Zhang; Jixing Liu; Miaomiao Liu; Shize Yang; Sheng Dai

doi:10.1002/cssc.201902705

Room-Temperature Synthesis of High-Entropy Perovskite Oxide Nanoparticle Catalysts through Ultrasonication-Based Method

ChemSusChem. 2020 Jan 9;13(1):111-115. doi: 10.1002/cssc.201902705. Epub 2019 Nov 29.

Authors

Francis Okejiri^{1

2}, Zihao Zhang¹, Jixing Liu¹, Miaomiao Liu¹, Shize Yang³, Sheng Dai^{1

2}

Affiliations

¹ Department of Chemistry, The University of Tennessee, Knoxville, Knoxville, TN, 37996, USA.
² Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
³ Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York, 11973, USA.

PMID: 31721472
DOI: 10.1002/cssc.201902705

Abstract

In the present study, a sonochemical-based method for one-pot synthesis of entropy-stabilized perovskite oxide nanoparticle catalysts with high surface area was developed. The high-entropy perovskite oxides were synthesized as monodispersed, spherical nanoparticles with an average crystallite size of approximately 5.9 nm. Taking advantage of the acoustic cavitation phenomenon in the ultrasonication process, BaSr(ZrHfTi)O₃ , BaSrBi(ZrHfTiFe)O₃ and Ru/BaSrBi(ZrHfTiFe)O₃ nanoparticles were crystallized as single-phase perovskite structures through ultrasonication exposure without calcination. Notably, the entropically-driven stability of Ru/BaSrBi(ZrHfTiFe)O₃ with excellent dispersion of Ru in the perovskite phase bestowed the nanoparticles of Ru/BaSrBi(ZrHfTiFe)O₃ with good catalytic activity for CO oxidation.

Keywords: acoustic cavitation; heterogeneous catalysis; high-entropy perovskites; nanoparticles; ultrasonication.

Grants and funding

U.S. Department of Energy