Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15967
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Funding
- New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from Ministry of Trade, Industry & Energy, Republic of Korea [20143030031430]
- Mid-career Researcher Program through the National Research Foundation of Korea [NRF-2015R1A2A1A10055886]
- Korea Research Fellowship Program through the National Research Foundation of Korea [2016H1D3A1909709]
- Ministry of Science, ICT and Future Planning
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2016-0790]
- Samsung Research Funding Center for Future Technology [G01150336]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20143030031430] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015R1A2A1A10055886, 2016R1D1A1B03931239, 2016H1D3A1909709] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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