Synthesis of Highly Crystalline Single-Phase CoNb₂O₆ Nanofibers at Low Temperature and Their Structural Characterizations

Abstract

We report the synthesis of highly crystalline single-phase CoNb2O6 nanofibers using an electrospinning method. Columbite niobate compounds (ANb2O6, A = Ca2+, Mg2+, Zn2+, Ni2+, Sn2+, and Co2+) are promising ceramic materials for many potential applications such as microwave devices and photocatalysts operating at room temperature. The fundamental characteristics including structural and electronic properties at room temperature, however, are not extensively studied at the moment. By combining the basic characterization utilizing electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and the first principles approach, we reveal the fundamental correlation between the lattice structure and the electronic structure of CoNb2O6. Our approach can readily be extended to studying other families of niobate ceramics made on the nanoscale for room-temperature applications.

Highly Stable Free‐standing Cobalt Niobate with Orthorhombic Structure as Anode Material for Li‐ion Batteries

“…were observed to have similar peaks in a study conducted by Husson et al [57] , which are supported by recent literature. [38,56,60] In the region between 200 and 300 cm À 1 , the peaks are the result of the coupling of stretching vibrations of MÀ O and the bending vibrations of OÀ NbÀ O bonds. [60] For instance, the peak at 280 cm À 1 corresponds to the coupling of these bonds, specifically involving MÀ O t , which implies the formation of a compound in the MNb 2 O 6 family.…”

“…For instance, cobalt niobate (CoNb 2 O 6 ) nanofibers were successfully prepared via electrospinning and annealing, which involved the use of solvents and multiple equipment. [38] Likewise, doped CoNb 2 O 6 nanoparticles were synthesized through hydrothermal method with various acids and other chemicals, [39] and using a molten salt method to obtain V-doped CoNb 2 O 6 . [40] More facile and cost-effective synthesis methods are required for large-scale applications as most methods involve multiple reagents and extremely high temperatures, often exceeding 1000 °C.…”