Replacement of Ca by Ni in a perovskite titanate to yield a novel perovskite exsolution architecture for oxygen-evolution reactions

JinGoo Lee*, Jae-ha Myung, Aaron Benjamin Naden, Ok Sung Jeon, Yong Gun Shul, John T. S. Irvine*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
4 Downloads (Pure)

Abstract

For efficient catalysis and electrocatalysis well‐designed, high‐surface‐area support architectures covered with highly dispersed metal nanoparticles with good catalyst‐support interactions are required. In situ grown Ni nanoparticles on perovskites have been recently reported to enhance catalytic activities in high‐temperature systems such as solid oxide cells (SOCs). However, the micrometer‐scale primary particles prepared by conventional solid‐state reactions have limited surface area and tend to retain much of the active catalytic element within the bulk, limiting efficacy of such exsolution processes in low‐temperature systems. Here, a new, highly efficient, solvothermal route is demonstrated to exsolution from smaller scale primary particles. Furthermore, unlike previous reports of B‐site exsolution, it seems that the metal nanoparticles are exsolved from the A‐site of these perovskites. The catalysts show large active site areas and strong metal‐support interaction (SMSI), leading to ≈26% higher geometric activity (25 times higher mass activity with 1.4 V of Eon‐set) and stability for oxygen‐evolution reaction (OER) with only 0.72 µg base metal contents compared to typical 20 wt% Ni/C and even commercial 20 wt% Ir/C. The findings obtained here demonstrate the potential design and development of heterogeneous catalysts in various low‐temperature electrochemical systems including alkaline fuel cells and metal–air batteries.
Original languageEnglish
Article number1903693
Number of pages6
JournalAdvanced Energy Materials
Volume10
Issue number10
Early online date30 Jan 2020
DOIs
Publication statusPublished - 10 Mar 2020

Keywords

  • Perovskite
  • Exsolution
  • Hydration
  • Electrocatalysis
  • Oxygen evolution reaction

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