VO is one of the most promising energy materials due to its specific physical and chemical properties.Herein,preparation VO via the reduction of V2O3 in an H2 atmosphere was presented.The thermodynamic calculation was first performed to ensure the reduction conditions and isothermal reduction experiments were then carried out at 1 623 K,1 648 K,and 1 673 K under a H2 gas flow.Thermodynamic calculations results indicated that the reduction of V2O3 is mainly affected by temperature and p(H2)/p(H2O),and the reaction temperature can be typically decreased with increasing p(H2)/p(H2O).The results show that the V2O3 reduction process conforms to the unreacted shrinkage core model,and the reaction process can be divided into two steps.The first step is controlled by a chemical reaction,the kinetic equation of the reaction is G(α)=[-In(1-α)]1/3,and the apparent activation energy is 107.3 kJ·mol-1.The second stage is controlled by gas diffusion.The kinetic equation of the reaction is G(α)=[1-(1-α)1/3]1/2,and the apparent activation energy is 45.5 kJ·mol-1.No other intermediate compounds were found in this study.The microanalysis indicated that the as-prepared VO powder is well-crystallized and the surface is compact.
vanadium monoxidethermodynamic calculationreaction sequenceapparent activation energyreductionlithium ion battery cathode material
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