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

doi:10.1021/acs.chemmater.3c02482

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

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2 Scopus citations

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 language	English (US)
Pages (from-to)	9434-9443
Number of pages	10
Journal	Chemistry of Materials
Volume	35
Issue number	21
DOIs	https://doi.org/10.1021/acs.chemmater.3c02482
State	Published - Nov 14 2023

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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10.1021/acs.chemmater.3c02482

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

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.",

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

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doi = "10.1021/acs.chemmater.3c02482",

language = "English (US)",

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T1 - Hidden Hydroxides in KOH-Grown BaNiO3 Crystals

T2 - A Potential Link to Their Catalytic Behavior

AU - Jin, Lun

AU - Wang, Haozhe

AU - Xu, Xianghan

AU - Ni, Danrui

AU - Yang, Chen

AU - Ku, Yu Chieh

AU - Liu, Cheng En

AU - Kuo, Chang Yang

AU - Chang, Chun Fu

AU - Sereika, Raimundas

AU - Bi, Wenli

AU - Xie, Weiwei

AU - Cava, Robert J.

PY - 2023/11/14

Y1 - 2023/11/14

N2 - 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.

AB - 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.

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U2 - 10.1021/acs.chemmater.3c02482

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SN - 0897-4756

VL - 35

SP - 9434

EP - 9443

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 21

ER -

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

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