B-site engineered bilayered Ruddlesden-Popper ferrites for efficient oxygen evolution and overall water electrolysis

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2026-06-01 Epub Date: 2026-02-02 DOI:10.1016/j.materresbull.2026.114040

Zhi Zhang , Zhenyu Lei , Zhenkang Sun , Mengfei Zhang , Yu Zhang , Qi Yang , Xinru Ma , Shengnan Chen , Jia Li , Minkai Qin , Yunyi Cao , Jianguo Liu

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Abstract

Developing durable oxygen evolution reaction (OER) electrocatalysts is pivotal for hydrogen production but hindered by sluggish kinetics. While Ruddlesden-Popper (RP) oxides offer a versatile platform, they often suffer from limited active site density. Herein, we present a targeted B-site engineering strategy to activate bilayer RP ferrites (La_0.25Sr_2.75Fe₂O₇) via systematic Ni incorporation. This substitution strengthens B-O covalency and enriches oxygen vacancies. The optimized LSFN50 exhibits a low overpotential of 344 mV at 10 mA cm^-2, surpassing commercial IrO₂. Mechanistic studies indicate a pH-dependent pathway. Systematic structural and chemical analyses reveal that high-valence Ni³⁺ and Fe-Ni synergy drive surface reconstruction into active oxyhydroxides, with lattice oxygen participation further boosting reaction kinetics. Significantly, an anion exchange membrane (AEM) water electrolyzer employing the LSFN50 anode delivers an industrial-grade current density of 2.23 A cm^-2 at 1.9 V. This study highlights the critical role of B-site modulation in designing high-performance catalysts for practical energy conversion.

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b点工程双层Ruddlesden-Popper铁氧体，用于高效的析氧和整体水电解

开发耐用的析氧反应（OER）电催化剂对制氢至关重要，但由于动力学缓慢而受到阻碍。虽然Ruddlesden-Popper （RP）氧化物提供了一个通用平台，但它们的活性位点密度有限。本文提出了一种有针对性的b位点工程策略，通过系统的Ni掺入来激活双层RP铁氧体（La0.25Sr2.75Fe2O7）。这种取代强化了B-O共价并丰富了氧空位。优化后的LSFN50在10 mA cm-2下的过电位为344 mV，超过了商用IrO2。机制研究表明ph依赖性途径。系统的结构和化学分析表明，高价Ni3+和Fe-Ni协同作用驱动表面重构成活性氢氧化物，晶格氧参与进一步促进了反应动力学。值得注意的是，采用LSFN50阳极的阴离子交换膜（AEM）水电解器在1.9 V下可提供2.23 A cm-2的工业级电流密度。该研究强调了b位调制在设计用于实际能量转换的高性能催化剂中的关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.