Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskitesopen access
- Authors
- Kwon, Ohhun; Sengodan, Sivaprakash; Kim, Kyeounghak; Kim, Gihyeon; Jeong, Hu Young; Shin, Jeeyoung; Ju, Young-Wan; Han, Jeong Woo; Kim, Guntae
- Issue Date
- Jun-2017
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.8, pp 1 - 7
- Pages
- 7
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 8
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/8300
- DOI
- 10.1038/ncomms15967
- ISSN
- 2041-1723
- 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.
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