Mataev Mukhametkali, Sarsenbaeva Zamira, Keskin Bahadir, Nurbekova Marzhan, Meldeshov Amangeldi, Tursyn Zhanar, Seitbekova Karima
Department of Chemistry, Faculty of Natural Sciences, Kazakh National Women's Teacher Training University, Gogol 114/1, Almaty 050000, Kazakhstan.
Department of Chemistry, Faculty of Arts & Science, Yildiz Technical University, Istanbul TR34220, Turkey.
Molecules. 2024 Dec 31;30(1):132. doi: 10.3390/molecules30010132.
This article presents the synthesis, electrophysical, and catalytic properties of a LaMnO-LaFeO nanocomposite material. The nanocomposite was synthesized via the sol-gel (Pechini) method. X-ray diffraction (XRD) analysis revealed a polycrystalline, biphasic perovskite structure combining both hexagonal and cubic symmetry. The microstructure and elemental composition, examined using field emission scanning electron microscopy (FESEM), indicated an average particle size of approximately 186.9 nm. The composite exhibits semiconducting behavior within the temperature ranges of 293-323 K and 343-393 K. Developing electrocatalysts free of precious metals for the hydrogen evolution reaction (HER) is increasingly important to facilitate the production of hydrogen from renewable sources. In this study, the conductive LaMnO-LaFeO composite was deposited on graphite and, for the first time, evaluated as an electrocatalyst for HER in acidic media. The resulting composite films were tested using linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) in a glassy carbon electrode (GCE) setup, providing insights into their potential as effective, cost-efficient electrocatalysts.
本文介绍了一种LaMnO-LaFeO纳米复合材料的合成、电物理和催化性能。该纳米复合材料通过溶胶-凝胶（佩琴尼）法合成。X射线衍射（XRD）分析显示出一种结合了六方和立方对称性的多晶双相钙钛矿结构。用场发射扫描电子显微镜（FESEM）检查的微观结构和元素组成表明平均粒径约为186.9nm。该复合材料在293-323K和343-393K的温度范围内表现出半导体行为。开发用于析氢反应（HER）的无贵金属电催化剂对于促进从可再生资源中制氢越来越重要。在本研究中，将导电的LaMnO-LaFeO复合材料沉积在石墨上，并首次评估其在酸性介质中作为HER电催化剂的性能。在玻碳电极（GCE）装置中使用线性扫描伏安法（LSV）和电化学阻抗谱（EIS）对所得复合膜进行测试，从而深入了解其作为有效、经济高效的电催化剂的潜力。
