Hidden Hydroxides in KOH-Grown BaNiO 3 Crystals: A Potential Link to Their Catalytic Behavior
Hidden Hydroxides in KOH-Grown BaNiO 3 Crystals: A Potential Link to Their Catalytic Behavior
复制标题
KOH 生长的 BaNiO 3 晶体中隐藏的氢氧化物：与其催化行为的潜在联系
DOI：
10.1021/acs.chemmater.3c02482
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发表时间：
2023
影响因子：
8.6
通讯作者：
Sereika, Raimundas
中科院分区：
文献类型：
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作者：
Jin, Lun;Wang, Haozhe;Xu, Xianghan;Ni, Danrui;Yang, Chen;Ku, Yu-Chieh;Liu, Cheng-En;Kuo, Chang-Yang;Chang, Chun-Fu;Sereika, Raimundas
通过非陶瓷方法制备的六方钙钛矿BaNiO3被认为是碱性介质中析氧反应（OER）的良好催化剂。在这里，我们报告了我们的观察，通过KOH助熔剂生长和高压陶瓷合成与高O2压力合成的BaNiO 3具有不同的磁性。我们表明，这是因为在露天的KOH助熔剂生长的晶体实际上是一个氢氧化物的形式BaNiO3，可以“干燥”退火后，在O2流。这项工作不仅揭示了BaNiO3OER催化剂以前未知的方面，并提供了一些关于潜在机制的见解，而且还表明氢氧根离子可能存在于在潮湿条件下制备的其他六方钙钛矿氧化物中。
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 BaNiO3synthesized via KOH flux growth and high-pressure ceramic synthesis with high O2pressure 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 BaNiO3that can be “dried” upon annealing in an O2flow. This work not only unveils a previously unknown aspect of the BaNiO3OER 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.