Elucidating the Catalytic Activity of Lattice-Distorted Double Perovskite Oxides as Bifunctional Electrocatalysts

IF 3.4 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Korean Journal of Chemical Engineering Pub Date : 2026-06-23 DOI:10.1007/s11814-026-00770-8

Hyeocksu Kim, Hak Sakong, Sang-Hee Park, Joohyuk Park

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Abstract

The overall performance of aqueous metal-air batteries is restricted by the inherently slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Therefore, the development of bifunctional oxygen catalyst is essential to overcome the kinetic limitations of ORR and OER. Among various metal oxide-based catalysts, perovskite oxides have received substantial interest because of their remarkable catalytic activity and structural stability in alkaline media. In the present work, we report a monoclinic double perovskite oxide (Pr₂MnCoO₆) as a highly active bifunctional electrocatalyst. The structural differences between Pr₂MnCoO₆ and the counterpart La₂MnCoO₆ were investigated using X-ray diffraction (XRD) and ex situ X-ray absorption spectroscopy (XAS). Interestingly, Pr₂MnCoO₆ showed increased local structural distortion and enhanced rock-salt ordering of the MnO₆ and CoO₆ octahedra compared with La₂MnCoO₆, which are suggested to influence electrocatalytic activities. Accordingly, Pr₂MnCoO₆ exhibited remarkable catalytic activities during ORR and OER, reducing reliance on noble-metal catalysts for oxygen electrocatalysis.

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晶格畸变双钙钛矿氧化物作为双功能电催化剂的催化活性研究

氧还原反应（ORR）和析氧反应（OER）固有的缓慢动力学限制了金属-空气水电池的整体性能。因此，开发双功能氧催化剂是克服ORR和OER的动力学限制的必要条件。在各种金属氧化物催化剂中，钙钛矿氧化物因其在碱性介质中具有显著的催化活性和结构稳定性而受到广泛关注。在目前的工作中，我们报道了一种单斜双钙钛矿氧化物（Pr2MnCoO6）作为一种高活性的双功能电催化剂。采用x射线衍射（XRD）和非原位x射线吸收光谱（XAS）研究了Pr2MnCoO6与La2MnCoO6的结构差异。有趣的是，与La2MnCoO6相比，Pr2MnCoO6表现出更大的局部结构畸变，MnO6和CoO6八面体的岩盐有序性增强，这可能会影响电催化活性。因此，Pr2MnCoO6在ORR和OER过程中表现出显著的催化活性，减少了氧电催化对贵金属催化剂的依赖。

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来源期刊

Korean Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

4.60

自引率

11.10%

发文量

310

审稿时长

4.7 months

期刊介绍： The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.