Mechanochemical Synthesis and Electrochemical Characterization of Nano Crystalline Calcium Ferrite

作者：Berchmans L John^*; Karthikeyan R; Helan M; Berchmans Sheela; Sepelak V; Becker K D

来源：Catalysis Letters, 2011, 141(10): 1451-1457.

DOI：10.1007/s10562-011-0636-9

• Nanostructures
• Electron microscopy
• X-ray diffraction
• Electrochemical properties

The studies on the mechanochemical synthesis and electrochemical characterization of orthorhombic calcium ferrite (CaFe(2)O(4)) are reported in this paper. Stoichiometric mixtures of alpha-Fe(2)O(3) and granulated Ca metal were used as the starting materials for the synthesis process. The synthesized calcium ferrite was characterized by room-temperature Mossbauer spectra, XRD and TEM. The electrochemical characterisation was carried out using cyclic voltammetry studies. Mossbauer spectra provide the yield of the reaction, information on the charge status, the local symmetry and the magnetic state of the iron ions in the mechanosynthesized ferrite material. XRD analysis of the CaFe(2)O(4) compound reveals the orthorhombic crystal structure with an average crystalline size of about 28 nm. TEM micrographs reveal the nanoparticles with irregular crystal morphology ranging from 8 to 30 nm. The electrochemical studies clearly show that the calcium ferrite compound can act as an electrocatalyst for Oxygen Evolution Reaction (OER).

• 出版日期2011-10