Thermal hydrolysis synthesis and characterization of monoclinic metahewettite CaV₆O₁₆·3H₂O

Abstract

Monoclinic metahewettite CaV₆O₁₆·3H₂O has been fabricated via thermal hydrolysis of calcium vanadate (Ca₁₀V₆O₂₅). High purity calcium vanadate precipitate, featuring column structure with surface area of 8.61 m²/g, can be obtained by reacting sodium orthovanadate (Na₃VO₄) with calcium oxide at 90 °C for 2 h. By acidification of calcium vanadate in hot water at pH of 1.0–3.0, the monoclinic metahewettite crystals with uniform particle distribution, layered structure and nonporous structure can be fabricated. With the well crystallized layered structure, CaV₆O₁₆·3H₂O may be a potential cathode material for secondary batteries as well as super capacitor materials.

Keywords

vanadium / hewettite / synthesis and characterization / electrochemical application

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