title: Rapid hydrothermal synthesis of VO2 (B) and its conversion to thermochromic VO2 (M1).
abstract: The present study provides a rapid way to obtain VO2 (B) under economical and environmentally friendly conditions. VO2 (B) is one of the well-known polymorphs of vanadium dioxide and is a promising cathode material for aqueous lithium ion batteries. VO2 (B) was successfully synthesized by rapid single-step hydrothermal process using V2O5 and citric acid as precursors. The present study shows that phase-pure VO2 (B) polytype can be easily obtained at 180 °C for 2 h and 220 °C for 1 h, that is, the lowest combination of temperature and duration reported so far. The obtained VO2 (B) is characterized by X-ray powder diffraction, high-resolution scanning electron microscopy, and Fourier transform infrared spectroscopy. In addition, we present an indirect way to obtain VO2 (M1) by annealing VO2 (B) under vacuum for 1 h.
authors.affiliation: Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), UPR 9048, F-33600 Pessac, France.
authors.forename: Srinivasa Rao
authors.initials: SR
authors.lastname: Popuri
authors.forename: Marinela
authors.initials: M
authors.lastname: Miclau
authors.forename: Alla
authors.initials: A
authors.lastname: Artemenko
authors.forename: Christine
authors.initials: C
authors.lastname: Labrugere
authors.forename: Antoine
authors.initials: A
authors.lastname: Villesuzanne
authors.forename: Michaël
authors.initials: M
authors.lastname: Pollet