title: Novel morphology changes from 3D ordered macroporous structure to V2O5 nanofiber grassland and its application in electrochromism.
abstract: Because vanadium pentoxide (V2O5) is the only oxide that shows both anodic and cathodic coloration electrochromism, the reversible lithium ion insertion/extraction processes in V2O5 lead to not only reversible optical parameter changes but also multicolor changes for esthetics. Because of the outstanding electrochemical properties of V2O5 nanofibers, they show great potential to enhance V2O5 electrochromism. However, the development and practical application of V2O5 nanofibers are still lacking, because traditional preparation approaches have several drawbacks, such as multiple processing steps, unsatisfactory electrical contact with the substrate, expensive equipment, and rigorous experimental conditions. Herein, we first report a novel and convenient strategy to prepare grass-like nanofiber-stacked V2O5 films by a simple annealing treatment of an amorphous, three-dimensionally ordered macroporous vanadia film. The V2O5 nanofiber grassland exhibits promising transmittance modulation, fast switching responses, and high color contrast because of the outstanding electrochemical properties of V2O5 nanofibers as well as the high Li-ion diffusion coefficients and good electrical contact with the substrate. Moreover, the morphology transformation mechanism is investigated in detail.
authors.affiliation: Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Zhongqiu
authors.initials: Z
authors.lastname: Tong
authors.affiliation: Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Haiming
authors.initials: H
authors.lastname: Lv
authors.affiliation: Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Haowei
authors.initials: H
authors.lastname: Yang
authors.affiliation: Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Yanlong
authors.initials: Y
authors.lastname: Tian
authors.affiliation: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Jiupeng
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Li