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Exsolution of phase-separated nanoparticles via trigger effect toward reversible solid oxide cell

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  • Jo, Seungyeon
  • Han Kim, Yo
  • Jeong, Hyeongwon
  • Park, Chan-ho
  • Won, Bo-Ram
  • Jeon, Hyejin
  • Taek Lee, Kang
  • Myung, Jae-ha

Abstract

The electrocatalytic characteristics of heterostructure nanoparticles have attracted attention for use in devices addressing energy and environmental issues. Among the various features, exsolved alloy or core–shell nanoparticles display high reactive surface area and strong interaction between the metal and substrate oxide. Herein, we report multifunctional heterostructure nanoparticles, namely Fe/Cu Janus nanoparticles (JN) and verify an exsolution trigger effect using Cu as a seed in the La0.43Sr0.37Fe0.09Cu0.03Ti0.88O3-δ (Fe75) perovskite substrate. During the exsolution process, the exsolved Cu particles played a key role in triggering the Fe exsolution by contributing additional surface energy. These Fe/Cu JNs exhibited outstanding catalytic activity in a reversible solid oxide cell fed with H2O/H2 and CO/CO2 fuels. A single cell with Fe75 showed an impressive current density of − 1.11 A cm−2 at 1.3 V and 900 °C. Our study experimentally elucidated the mechanism of the triggering of co-exsolution and demonstrated a multifunctional catalyst using Fe/Cu JNs.

Suggested Citation

  • Jo, Seungyeon & Han Kim, Yo & Jeong, Hyeongwon & Park, Chan-ho & Won, Bo-Ram & Jeon, Hyejin & Taek Lee, Kang & Myung, Jae-ha, 2022. "Exsolution of phase-separated nanoparticles via trigger effect toward reversible solid oxide cell," Applied Energy, Elsevier, vol. 323(C).
    • Handle: RePEc:eee:appene:v:323:y:2022:i:c:s0306261922009199
    DOI: 10.1016/j.apenergy.2022.119615
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    1. 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.
    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. Jae-ha Myung & Dragos Neagu & David N. Miller & John T. S. Irvine, 2016. "Switching on electrocatalytic activity in solid oxide cells," Nature, Nature, vol. 537(7621), pages 528-531, September.
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    1. Lincheng, Xu & Yue, Wang & Yong, Yan & Zhanzhong, Hao & Xin, Chen & Fan, Li, 2023. "Optimisation of the electronic structure by rare earth doping to enhance the bifunctional catalytic activity of perovskites," Applied Energy, Elsevier, vol. 339(C).

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