Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites
SCIE
SCOPUS
- Title
- Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites
- Authors
- KWON, OHHUN; SENGODAN, SIVAPRAKASH; KIM, KYEOUNGHAK; KIM, GIHYEON; JEONG, HU YOUNG; SHIN, JEEYOUNG; JU, YOUNG-WAN; HAN, JEONG WOO; KIM, GUNTAE
- Date Issued
- 2017-06-28
- Publisher
- NATURE PUBLISHING GROUP
- Abstract
- In perovskites, exsolution of transition metals has been proposed as a smart catalyst design for energy applications. Although there exist transition metals with superior catalytic activity, they are limited by their ability to exsolve under a reducing environment. When a doping element is present in the perovskite, it is often observed that the surface segregation of the doping element is changed by oxygen vacancies. However, the mechanism of co-segregation of doping element with oxygen vacancies is still an open question. Here we report trends in the exsolution of transition metal (Mn, Co, Ni and Fe) on the PrBaMn2O5-delta layered perovskite oxide related to the co-segregation energy. Transmission electron microscopic observations show that easily reducible cations (Mn, Co and Ni) are exsolved from the perovskite depending on the transition metal-perovskite reducibility. In addition, using density functional calculations we reveal that co-segregation of B-site dopant and oxygen vacancies plays a central role in the exsolution.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/96124
- DOI
- 10.1038/ncomms15967
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- Nature Communications, vol. 8, page. 15967, 2017-06-28
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- There are no files associated with this item.
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