Preparation, characterization and electronic properties of LaFeO3 perovskite as photocatalyst for hydrogen production

漫反射红外傅里叶变换 X射线光电子能谱 钙钛矿(结构) 分析化学(期刊) 漫反射 带隙 材料科学 磁化 微晶 化学 光催化 催化作用 结晶学 核磁共振 量子力学 磁场 光学 物理 生物化学 光电子学 色谱法
作者
A. Boulahouache,M. Benlembarek,N. Salhi,A. M. Djaballah,C. Rabia,M. Trari
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:48 (39): 14650-14658 被引量:18
标识
DOI:10.1016/j.ijhydene.2022.12.327
摘要

Perovskite-type LaFeO3 was successfully used as photocatalyst for the H2 production. It was prepared by a conventional sol-gel technique via the nitrate route. X-Ray fluorescence/Energy Dispersive X-Ray fluorescence (XRF), X-Ray Diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), UV–Visible diffuse reflectance, FTIR spectroscopy, Scanning Electron Microscopy (SEM/EDX) and specific surface area were deployed to characterize the synthetized material after heat-treated at 850 °C. LaFeO3 crystallizes in a cubic structure (Space Group: Pm3 m) with a crystallite size of 16 nm and BET surface area of 12 m2/g. Field-dependent magnetization was measured at 300 K in the region (±25 kOe) and the perovskite exhibits a high magnetism with a saturation magnetization (0.15 emu/g). Such result indicates that the Fe-3d are in localized high spin state. LaFeO3 has a narrow band gap of 2.08 eV determined by diffuse reflectance resulting to the crystal field splitting of 3d orbital of Fe3+ octahedrally coordinated with an internal d-d transition. Cyclic voltammetry showed the reduction of adsorbed H2O molecules to gaseous hydrogen at −0.7 VSCE, a potential less cathodic than the conduction band (−0.45 VSCE). The latter was determined from the capacitance measurements in alkaline electrolyte (NaOH 0.1 M) where the perovskite exhibits a stability with an exchange current density of ∼0.4 mA cm−2. The photocatalytic activity reveals an optimal H2 production of 99 μmol after 20 min at 50 °C in NaOH medium and a catalyst mass of 50 mg, under visible light irradiation (13 W) in the presence of thiosulfate S2O32− as hole scavenger.
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