The Controllable Fabrication Of Zinc Vanadates Nanomaterials

In recent years, zinc vanadates micro/nanomaterials have exhibited potential applications in catalysis, photoluminescence, and energy storage due to their nanoscale effect comparing with their bulk counterparts. Synthesis of micro/nanostructures with well-defined size, dimensionality, morphology and diversity via efficient and low-cost routes and investigation of their growth mechanism should be a pivotal precondition to enhance the fascinating prospect in applications. In the dissertation, a series of micro/nanomaterials of zinc vanadates with uniform size and shape were successfully prepared through solid-state reaction method and hydrothermal route. In addition, the electrochemical performances of as-prepared samples were researched via galvanostatic charge-discharge cycling tests.Monoclinic m-Zn V2O6 bulk particles were fabricated via simple solid-state reaction method. The m-Zn V2O6 microstructures with different morphology were selectively explored by changing the critical experimental parameters of dwell time and reaction temperature. The m-Zn V2O6 nanowires wih uniform size have been fabricated by a simple hydrothermal approach. A novel ‘‘dissolution recrystalizaion–Ostwald ripening–splitting’’ combination mechanism for uniform nanowires was proposed by further monitoring the time-dependent evolution of morphologies and phases. The chargedischarge experiments were performed to investigate the electrochemical properties of zinc vanadates micro/nanomaterials. Furthermore, these m-Zn V2O6 nanowires with high aspect ratio exhibit a better reversible capacity and a much excellent cyclic retention than that of as-obtained mesostructures and bulk counterparts because of better contact behavior and a shorter diffusion length for Li+, implying a promising candidate for the application in high-energy batteries.