Enhanced oxygen evolution reaction (OER) activity in LiMgFe₂O₄: structural, morphological, and magnetic insights

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2025-03-25 DOI:10.1007/s11581-025-06229-w

Nilesh N. Kengar, Atul D. Teli, Guruprasad A. Bhinge, Chidanand M. Kanamadi

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引用次数: 0

Abstract

This work investigates the influence of varying lithium (Li) ion concentrations in magnesium ferrite (MgFe₂O₄) on the OER. Li_xMg_(1-x)Fe₂O₄ materials were synthesized using the solid-state reaction method, and their structural, morphological, and water-splitting behaviours were explored. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the cubic structure and elemental composition of the materials, respectively. The crystallite size increased from 37.65 to 60.35 nm, and the X-ray density decreased from 5.53 to 5.42 g/cm³ as the molar concentration of lithium ions increased in magnesium ferrite. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of functional groups in the materials. Scanning electron microscopy (SEM) revealed agglomerated nanocrystals of varying sizes on the material’s surface. The magnetic properties of the soft magnetic material is studied by Vibrating sample magnetometer (VSM). The particle size and shape were observed by transmission electron microscopy (TEM). Thin films of the synthesized powder were prepared using the doctor blade method for electrochemical characterization. Electrochemical analysis showed that the synthesized material exhibited an overpotential of 391 mV at a current density of 10 mA/cm² for the OER. These findings highlight the tuneable electrocatalytic properties of Li_xMg_(1-x)Fe₂O₄ and its potential for applications in renewable energy conversion technologies.

Graphical Abstract

Graphical representation of LiMgFe₂O₄ for efficient OER

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LiMgFe₂O₄中氧析反应（OER）活性的增强：结构、形态和磁性见解

本文研究了铁酸镁（MgFe2O4）中不同锂离子浓度对OER的影响。采用固相法合成了LixMg(1-x)Fe2O4材料，并对其结构、形态和水裂解行为进行了研究。x射线衍射（XRD）和x射线光电子能谱（XPS）分别证实了材料的立方结构和元素组成。随着铁酸镁中锂离子摩尔浓度的增加，晶粒尺寸从37.65 nm增大到60.35 nm， x射线密度从5.53 g/cm3减小到5.42 g/cm3。傅里叶红外光谱（FTIR）证实了材料中官能团的存在。扫描电子显微镜（SEM）显示材料表面有不同大小的纳米晶体聚集。用振动样品磁强计（VSM）研究了软磁材料的磁性能。用透射电镜（TEM）观察了颗粒的大小和形状。采用博士刀法制备了粉末薄膜，并对其进行了电化学表征。电化学分析表明，在OER电流密度为10 mA/cm2时，合成材料的过电位为391 mV。这些发现突出了LixMg(1-x)Fe2O4的可调谐电催化性能及其在可再生能源转换技术中的应用潜力。高效OER的LiMgFe2O4的图形表示

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.