Journal
NANO LETTERS
Volume 20, Issue 5, Pages 3538-3544Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00488
Keywords
perovskite stannate; exsolution; high electrical conductivity; delocalized orbitals; Ellingham diagram
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017R1D1A1B03034896, 2020R1A2C2006389]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- National Research Foundation of Korea [2017R1D1A1B03034896, 2020R1A2C2006389] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In situ exsolution of metal nanoparticles (NPs) is emerging as an alternative technique to deliver thermally stable and evenly dispersed metal NPs, which exhibit excellent adhesion with conducting perovskite oxide supports. Here we provide the first demonstration that Ni metal NPs with high areal density (similar to 175 mu m(-2)) and fine size (similar to 38.65 nm) are exsolved from an Asite-deficient perovskite stannate support (La0.2Ba0.7Sn0.9Ni0.1O3-delta(LBSNO)). The NPs are strongly anchored and impart coking resistance, and the Ni-exsolved stannates show exceptionally high electrical conductivity (similar to 700 S.cm(-1)). The excellent conductivity is attributed to conduction between delocalized Sn Ss orbitals along with structural improvement toward ABO(3) stoichiometry in the stannate support. We also reveal that experimental conditions with strong interaction must be optimized to obtain Ni exsolution without degrading the perovskite stannate framework. Our finding suggests a unique process to induce the formation of metal NPs embedded in stannate with excellent electrical properties.
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