Analysis of cyclic voltammograms of electrochromic a-WO3 films from voltage-dependent equilibrium capacitance measurements

Large-scale synthesis of single-crystal hexagonal tungsten trioxide nanowires and electrochemical lithium intercalation into the nanocrystals

“…After the second cycle the electrode demonstrates quite a reversible behavior. In the following cycles, there is no substantial change in the curve shape between 1.0 and 1.5 V. Our results are in good agreement with that of nanosized a-WO 3 particles reported by GarciaBelmonte et al [28]. Fig.…”

Jump diffusion coefficient of different cations intercalated into amorphous WO3

“…All samples in this work (a-WO 3 onto ITO substrates) were deposited by electron beam evaporation using the procedure described elsewhere [15]. The thickness of the samples was L = 400 nm, confirmed by profilometry techniques.…”

Composition Dependence of the Energy Barrier for Lithium Diffusion in Amorphous WO[sub 3]

“…For instance, the insertion of Li into amorphous WO 3 shows a monotonic variation of the potential with the insertion level, x = n/N ͑molar fraction in Li x WO 3 ͒, where n and N are the number densities of inserted ions and W atoms, respectively. [1][2][3] These variations have been interpreted either considering distributions of site energies 2,4 or guest-host interaction mechanisms. 5,6 In addition, a strong dependence of the chemical diffusion coefficient on the composition is well documented for low and medium insertion levels, 1,7 although nearly constant values have been also reported.…”

“…This result points out that the observed dependence ⌬E ϰ ck B T ln x is an intrinsic property of the elementary hopping process rather than a behavior induced by the inherent disorder of the glassy structure. 3 . ͑b͒ An example of experimental data derived from measurements of D J ͑Fig.…”