Lixiong Yin

Soft chemical in situ synthesis, formation mechanism and electrochemical performances of 1D bead-like AgVO3 nanoarchitectures

The soft chemical process is a useful and unique method for the preparation and design of one-dimensional (1D) nanoarchitectures. 1D bead-like AgVO3 nanoarchitectures are prepared via a soft chemical in situ reaction using the layered structure K2V6O16·2.7H2O platelike particles as the precursor. The formation mechanism is investigated through tracing the evolution of the structure and morphology of intermediate products during the reaction, and it consists of two processes. One is the in situ reaction of the Ag+ ions with the V3O8 layers of K2V6O16. The other is the fragmentation of the 2D platelike composite into a 1D fiber composite. Moreover, the electrochemical investigation shows that after 50 cycles at a current density of 100 mA g−1, the 1D bead-like nanostructure cathode exhibits a higher discharge capacity (127 mA h g−1) than that of 1D nanowires (75 mA h g−1), mainly due to the larger specific surface area and fine particles-constructed architecture.

Controllable synthesis and morphology evolution from two-dimensions to one-dimension of layered K2V6O16·nH2O

A two-dimensional (2D) layered K2V6O16·2.7H2O platelike single crystal was successfully synthesized in a short time of 3 h via a simple hydrothermal method. The number of H2O molecules and the morphology of the layered K2V6O16·nH2O hexavanadate crystal can be easily controlled by adjusting the pH value of the system and the reaction time used for the hydrothermal process. By studying the structure and morphology of hexavanadate samples obtained at different reaction times under acid conditions using an X-ray diffractometer (XRD), a field emission scanning electron microscope (FE-SEM) and a transmission electron microscope (TEM), it can be concluded that the 2D layered K2V6O16·2.7H2O platelike single crystal hexavanadate gradually evolves into a one-dimensional (1D) layered K2V6O16·1.5H2O fiberlike single crystal hexavanadate during the hydrothermal process as the reaction time is prolonged. In addition, the photocatalytic performance of the as-prepared products was explored.