Synthesis, physical, and electrochemical properties of the spinel Co₂TiO₄

期刊论文
发表日期：

2025年10月15日

查看全文

Sabrina Mirad,
Gharib Rekhila,
Mohammed Trari

摘要

The spinel Co₂TiO₄ prepared by autocombustion crystallizes in a cubic symmetry with a lattice constant of 0.8433 nm. FT-IR and Raman spectra confirmed the single phase with characteristic peaks of ^IVCo–O and ^VITi–O. The specific surface area (34 m² g⁻¹) was obtained from the isotherm analysis. The optical transitions (1.26 and 1.56 eV) evaluated from the diffuse reflectance are due to internal transition d-d of Co²⁺. The magnetic properties measured at 300 K in the range (± 25 kOe) are field dependent with a saturation magnetization of 1.25 emu/g and a coercivity field of 30 Oe. The cyclic voltammetry (CV) in Na₂SO₄ solution shows electrochemical stability with a water splitting of 2.2 V and overvoltage of ~ 1 V. A hole density (N_A) of 5.8 × 10¹⁸ cm⁻³ and a flat band potential (E_fb) of + 0.16 V_SCE were extracted from the dependence of the interfacial capacitance on the potential (C⁻² − E). A potential diagram has been suggested that predicts the spontaneity of hydrogen evolution reaction (HER).

Graphical abstract

Synthesis, physical, and electrochemical properties of the spinel Co2TiO4

摘要

Synthesis, physical, and electrochemical properties of the spinel Co₂TiO₄