Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites.

Citation data:

Nature communications, ISSN: 2041-1723, Vol: 8, Page: 15967

Publication Year:
2017
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/22291
PMID:
28656965
DOI:
10.1038/ncomms15967
Author(s):
Kwon, Ohhun; Sengodan, Sivaprakash; Kim, Kyeounghak; Kim, Gihyeon; Jeong, Hu Young; Shin, Jeeyoung; Ju, Young-Wan; Han, Jeong Woo; Kim, Guntae
Publisher(s):
Springer Nature; NATURE PUBLISHING GROUP
Tags:
Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy
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article description
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 PrBaMnO 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.