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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
Publication Date
Jun 28, 2017
Source
[email protected]
Keywords
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Unknown
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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. / 1 / 1 / Y / scie / scopus

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