Comparison of preparation routes of spinel catalyst for alkaline fuel cells

Magnetic properties of Zn0.7Co2.3O4+δ spinel prepared by thermal decomposition of binary oxalates in air

“…As is seen from Fig. 1, the X-ray diffraction peaks of Zn 0.7 Co 2.3 O 4 (220) are displaced towards larger angles as compared with the sample obtained at 700 K. This agrees with previously published data [6] and may be due to a higher average degree of oxidation of cobalt in the sample synthesized at a low temperature. These data show that the oxygen content in this product is higher in comparison with stoichiometry and the structure of the formed spinel is deficient in the cationic subsystem.…”

“…It was repeatedly pointed out in works devoted to synthesis [4][5][6] that the properties of cobaltites depend essentially on the methods of synthesis and the temperature of formation. The observed peculiarities were analysed using X-ray diffraction, electron and infrared spectroscopy and thermal analysis methods.…”

Magnetic behavior of MnCo2O4+δ spinel obtained by thermal decomposition of binary oxalates

“…[1][2][3][4]. Those compounds are currently synthesized by low-temperature techniques allowing to obtain the final products in the nanocrystalline or ultradisperse states.…”

“…The low-temperature methods of synthesis are based on decomposition of precursors-preliminarily deposited hydroxides or salts of cobalt and other transition metals-at 400 1C or lower temperatures (Ref. [2] and references therein). Nitrates, oxalates, acetates of the corresponding metals, etc., are usually used as salts.…”

Hydrothermal synthesis and characterization of MnCo2O4 in the low-temperature hydrothermal process: Their magnetism and electrochemical properties

“…Among these, transition-metal cobaltites having a spinel structure MCo 2 O 4 (M = Mn, Ni, Zn) with unusual physicochemical properties are widely used in many areas such as colossal magnetoresistance (CMR), sensors, fuel cell electrodes, electrical catalysts, microwave adsorption, etc. [4][5][6][7]. In particular, lithium-ion batteries (LIBs) have become the main power source for today's portable electronics and are being actively pursued for propelling electric vehicles in the near future.…”