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Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential

Author

Listed:
  • Sanaz Koohfar

    (Massachusetts Institute of Technology
    Massachusetts Institute of Technology)

  • Masoud Ghasemi

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Tyler Hafen

    (LLC)

  • Georgios Dimitrakopoulos

    (Massachusetts Institute of Technology)

  • Dongha Kim

    (Massachusetts Institute of Technology)

  • Jenna Pike

    (LLC)

  • Singaravelu Elangovan

    (LLC)

  • Enrique D. Gomez

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Bilge Yildiz

    (Massachusetts Institute of Technology
    Massachusetts Institute of Technology
    Massachusetts Institute of Technology)

Abstract

The instability of the surface chemistry in transition metal oxide perovskites is the main factor hindering the long-term durability of oxygen electrodes in solid oxide electrochemical cells. The instability of surface chemistry is mainly due to the segregation of A-site dopants from the lattice to the surface. Here we report that cathodic potential can remarkably improve the stability in oxygen reduction reaction and electrochemical activity, by decomposing the near-surface region of the perovskite phase in a porous electrode made of La1-xSrxCo1-xFexO3 mixed with Sm0.2Ce0.8O1.9. Our approach combines X-ray photoelectron spectroscopy and secondary ion mass spectrometry for surface and sub-surface analysis. Formation of Ruddlesden-Popper phase is accompanied by suppression of the A-site dopant segregation, and exsolution of catalytically active Co particles onto the surface. These findings reveal the chemical and structural elements that maintain an active surface for oxygen reduction, and the cathodic potential is one way to generate these desirable chemistries.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42462-5
    DOI: 10.1038/s41467-023-42462-5
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    References listed on IDEAS

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    1. 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.
    2. Sangwook Joo & Ohhun Kwon & Kyeounghak Kim & Seona Kim & Hyunmin Kim & Jeeyoung Shin & Hu Young Jeong & Sivaprakash Sengodan & Jeong Woo Han & Guntae Kim, 2019. "Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    3. Dragos Neagu & Tae-Sik Oh & David N. Miller & Hervé Ménard & Syed M. Bukhari & Stephen R. Gamble & Raymond J. Gorte & John M. Vohs & John T.S. Irvine, 2015. "Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
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