Hidden Hydroxides in KOH-Grown BaNiO3 Crystals: A Potential Link to Their Catalytic Behavior

Lun Jin, Haozhe Wang, Xianghan Xu, Danrui Ni, Chen Yang, Yu Chieh Ku, Cheng En Liu, Chang Yang Kuo, Chun Fu Chang, Raimundas Sereika, Wenli Bi, Weiwei Xie, Robert J. Cava

Research output: Contribution to journalArticlepeer-review

Abstract

The hexagonal perovskite BaNiO3, prepared via nonceramic approaches, is known to act as a good catalyst for the oxygen evolution reaction (OER) in alkaline media. Here, we report our observation that BaNiO3 synthesized via KOH flux growth and high-pressure ceramic synthesis with high O2 pressure have different magnetic properties. We show that this is because the KOH flux-grown crystals made in open air are actually a hydroxide-containing form of BaNiO3 that can be “dried” upon annealing in an O2 flow. This work not only unveils a previously unknown aspect of the BaNiO3 OER catalyst and offers some insights into the underlying mechanism, but also suggests that hydroxide ions may be present in other hexagonal perovskite oxides prepared in wet conditions.

Original languageEnglish (US)
Pages (from-to)9434-9443
Number of pages10
JournalChemistry of Materials
Volume35
Issue number21
DOIs
StatePublished - Nov 14 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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