A New Family of Perovskite Catalysts for Oxygen-Evolution Reaction in Alkaline Media: BaNiO3 and BaNi0.83O2.5

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• 作者：Jin Goo Lee ; Jeemin Hwang ; Ho Jung Hwang ; Ok Sung Jeon ; Jeongseok Jang ; Ohchan Kwon ; Yeayeon Lee ; Byungchan Han ; Yong-Gun Shul
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 16, 2016
• 年：2016
• 卷：138
• 期：10
• 页码：3541-3547
• 全文大小：431K
• ISSN：1520-5126

文摘

Establishment of a sustainable energy society has been strong driving force to develop cost-effective and highly active catalysts for energy conversion and storage devices such as metal–air batteries and electrochemical water splitting systems. This is because the oxygen evolution reaction (OER), a vital reaction for the operation, is substantially sluggish even with precious metals-based catalysts. Here, we show for the first time that a hexagonal perovskite, BaNiO₃, can be a highly functional catalyst for OER in alkaline media. We demonstrate that the BaNiO₃ performs OER activity at least an order of magnitude higher than an IrO₂ catalyst. Using integrated density functional theory calculations and experimental validations, we unveil that the underlying mechanism originates from structural transformation from BaNiO₃ to BaNi_0.83O_2.5 (Ba₆Ni₅O₁₅) over the OER cycling process.