Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Sangwook Joo, Ohhun Kwon, Kyeounghak Kim, Seona Kim, Hyunmin Kim, Jeeyoung Shin, Hu Young Jeong, Sivaprakash Sengodan, Jeong Woo Han and Guntae Kim ()
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Sangwook Joo: Ulsan National Institute of Science and Technology (UNIST)
Ohhun Kwon: Ulsan National Institute of Science and Technology (UNIST)
Kyeounghak Kim: Pohang University of Science and Technology (POSTECH)
Seona Kim: Ulsan National Institute of Science and Technology (UNIST)
Hyunmin Kim: Ulsan National Institute of Science and Technology (UNIST)
Jeeyoung Shin: Sookmyung Women’s University
Hu Young Jeong: UNIST
Sivaprakash Sengodan: Imperial College London
Jeong Woo Han: Pohang University of Science and Technology (POSTECH)
Guntae Kim: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Exsolution has been intensively studied in the fields of energy conversion and storage as a method for the preparation of catalytically active and durable metal nanoparticles. Under typical conditions, however, only a limited number of nanoparticles can be exsolved from the host oxides. Herein, we report the preparation of catalytic nanoparticles by selective exsolution through topotactic ion exchange, where deposited Fe guest cations can be exchanged with Co host cations in PrBaMn1.7Co0.3O5+δ. Interestingly, this phenomenon spontaneously yields the host PrBaMn1.7Fe0.3O5+δ, liberating all the Co cations from the host owing to the favorable incorporation energy of Fe into the lattice of the parent host (ΔEincorporation = −0.41 eV) and the cation exchange energy (ΔEexchange = −0.34 eV). Remarkably, the increase in the number of exsolved nanoparticles leads to their improved catalytic activity as a solid oxide fuel cell electrode and in the dry reforming of methane.

Date: 2019
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DOI: 10.1038/s41467-019-08624-0

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