Formation of FeMoO4 hollow microspheres via a chemical conversion-induced Ostwald ripening process

Abstract

FeMoO 4 hollow microspheres were prepared via a template-free hydrothermal method using FeCl 2 and Na 2 MoO 4 as the starting reaction reagents and distilled water as the solvent. The crystal structure, morphology and UV-vis reflection property of the as-synthesized products are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The hollow microspheres have diameters ranging from 3 to 5 mm, hollow interiors of y2.5 mm and the shell is constructed by numerous nanoparticles with sizes of 100-200 nm. The effects of reaction temperature, concentration of reaction reagents and reaction times have been studied. The formation mechanism of the FeMoO 4 hollow microspheres is related to the chemical conversion-induced Ostwald ripening process.

Recent Developments and Understanding of Novel Mixed Transition‐Metal Oxides as Anodes in Lithium Ion Batteries

“…It has been concluded that graphene not only contributes as a highly conductive network, but also as a flexible supporting layer, effectively relieving the volume change and particle aggregation. In addition, different metals and metal oxides that are electrochemically active and exhibit low volume change have been introduced to combine with transition metals or transition metal oxides . It is considered that the primary benefit of the additional materials is to provide a mechanical buffer for accommodating volume changes that otherwise would lead to disintegration .…”

Enhanced electrochemical performance of CoMoO4 nanorods/reduced graphene oxide as anode material for lithium-ion batteries

“…Metal molybdates (XMoO 4 , X = transitional metal) are found to be very attractive anode materials for the ability of the metal ions to exist in several oxidation states in these oxides, ranging from 3 + to 6 + for Mo and reversibly reacting with Li delivering high capacity, at potentials lower than 2 V [3][4][5][6]. Up to now, CoMoO 4 , MnMoO 4 , NiMoO 4 , ZnMoO 4 , MgMoO 4 , etc [7][8][9][10][11][12][13] have been demonstrated that they can form stably. Among these metal molybdates, CoMoO 4 is regarded as the most promising candidate of anode materials in LIBs because the advantages, including high redox activity and good capability retention, of cobalt oxide [14][15][16][17].…”

One-Pot Hydrothermal Synthesis of FeMoO4Nanocubes as an Anode Material for Lithium-Ion Batteries with Excellent Electrochemical Performance

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