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

Author

Listed:
  • Ohhun Kwon

    (Ulsan National Institute of Science and Technology (UNIST))

  • Sivaprakash Sengodan

    (Ulsan National Institute of Science and Technology (UNIST))

  • Kyeounghak Kim

    (University of Seoul)

  • Gihyeon Kim

    (Ulsan National Institute of Science and Technology (UNIST))

  • Hu Young Jeong

    (UNIST Central Research Facilities and School of Materials Science and Engineering, UNIST)

  • Jeeyoung Shin

    (Sookmyung Women’s University)

  • Young-Wan Ju

    (Wonkwang University)

  • Jeong Woo Han

    (University of Seoul)

  • Guntae Kim

    (Ulsan National Institute of Science and Technology (UNIST))

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+δ 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.

Suggested Citation

  • Ohhun Kwon & Sivaprakash Sengodan & Kyeounghak Kim & Gihyeon Kim & Hu Young Jeong & Jeeyoung Shin & Young-Wan Ju & Jeong Woo Han & Guntae Kim, 2017. "Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15967
    DOI: 10.1038/ncomms15967
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    Cited by:

    1. Hyunmin Kim & Chaesung Lim & Ohhun Kwon & Jinkyung Oh & Matthew T. Curnan & Hu Young Jeong & Sihyuk Choi & Jeong Woo Han & Guntae Kim, 2021. "Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    2. Kim, J. & Sengodan, S. & Kim, S. & Kwon, O. & Bu, Y. & Kim, G., 2019. "Proton conducting oxides: A review of materials and applications for renewable energy conversion and storage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 606-618.
    3. Sanaz Koohfar & Masoud Ghasemi & Tyler Hafen & Georgios Dimitrakopoulos & Dongha Kim & Jenna Pike & Singaravelu Elangovan & Enrique D. Gomez & Bilge Yildiz, 2023. "Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    4. Hyeon Han & Yaolong Xing & Bumsu Park & Dmitry I. Bazhanov & Yeongrok Jin & John T. S. Irvine & Jaekwang Lee & Sang Ho Oh, 2022. "Anti-phase boundary accelerated exsolution of nanoparticles in non-stoichiometric perovskite thin films," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    5. Bo-Wen Zhang & Meng-Nan Zhu & Min-Rui Gao & Xiuan Xi & Nanqi Duan & Zhou Chen & Ren-Fei Feng & Hongbo Zeng & Jing-Li Luo, 2022. "Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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