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, Guntae Kim

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

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 PrBaMn 1.7 Co 0.3 O 5+δ . Interestingly, this phenomenon spontaneously yields the host PrBaMn 1.7 Fe 0.3 O 5+δ , liberating all the Co cations from the host owing to the favorable incorporation energy of Fe into the lattice of the parent host (ΔE incorporation = −0.41 eV) and the cation exchange energy (ΔE exchange = −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.

Original languageBritish English
Article number697
JournalNature Communications
Volume10
Issue number1
DOIs
StatePublished - 1 Dec 2019

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