On the preparation of Tri-vanadium hepta-oxide thin films for electrochromic applications

Color switching in V3O7·H2O films cycled in Li and Na based electrolytes: novel vanadium oxide based electrochromic materials

“…In this study, the peak centered at 518.2 eV is attributed to the V 5+ state, while the peak centered at 516.3 eV is for the V 4+ oxidation state. 28,30 The determination of the two proportions for the V 5+ /V 4+ ratio summarized in Table 1, is in favor of the V 5+ ion in agreement with the V3O7.H2O formula. Please do not adjust margins…”

“…In 2019, Cristopher et al reported the EC properties of the non-hydrated phase from V3O7 thin films deposited by spray pyrolysis aiming at smart windows application. 28 Herein, the electrochromic properties of the oxyhydroxide V3O7.H2O are investigated. In addition, we introduce a facile strategy that lead to synthesize V3O7.H2O nanobelts by using V2O5 as vanadium source and 4-aminophenol which acts as a reducing and structure directing agent.…”

Photocatalytic Processes for Environmental Applications

“…V 3 O 7 is a mixed valence oxide with a ratio of V 4+ /V 5+ = 0.5. This vanadium oxide has a bandgap of 2.5 eV at room temperature, and it is rather considered as a semiconductor as most of the vanadium oxides in their insulating phase [129]. The structure of crystalline V 3 O 7 •H 2 O is orthorhombic with a space group Pnam [127,128].…”

“…This phase has a layered structure similar to orthorhombic V 2 O 5 since V 3 O 7 •H 2 O is mostly prepared from vanadium (V) oxide [127]. V 3 O 7 •H 2 O is composed of layers of [VO 6 ] octahedra and [VO 5 ] trigonal bipyramids sharing corners [126,128,129]. In the structure of V 3 O 7 •H 2 O, the water molecule is bound to vanadium by replacing one of the oxygen atoms in the [VO 6 ] octahedron, thus forming hydrogen bonds with the octahedron in the next layer which gives a 3D structure [128].…”

“…Like V 6 O 13 , V 3 O 7 •H 2 O is also a promising cathode material in LIBs since these materials have high initial capacity which is closely related to their layered structure together with the presence of mixed valence states of vanadium ions [127]. In addition, V 3 O 7 •H 2 O exhibits excellent electrochromic performance because of optical modulation in both anodic and cathodic reactions, thus making V 3 O 7 •H 2 O an excellent candidation cathode material for electrochromic applications [129]. For instance, in the form of films, V 3 O 7 •H 2 O can switch reversibly between a reduced blue state (at −1.2 V) and an oxidized orange state (at +1.9 V) [130].…”