Electrochemistry and Rapid Electrochromism Control of MoO3/V2O5 Hybrid Nanobilayers.

Chung-Chieh Chang,Prem Chandan,Chung-Kwei Lin,Po-Wei Chi

doi:10.3390/ma12152475

Chung-Chieh Chang, Prem Chandan + Show 2 more

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https://doi.org/10.3390/ma12152475

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Abstract

MoO3/V2O5 hybrid nanobilayers are successfully prepared by the sol–gel method with a spin- coating technique followed by heat -treatment at 350 °C in order to achieve a good crystallinity. The composition, morphology, and microstructure of the nanobilayers are characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD) that revealed the a grain size of around 20–30 nm, and belonging to the monoclinic phase. The samples show good reversibility in the cyclic voltammetry studies and exhibit an excellent response to the visible transmittance. The electrochromic (EC) window displayed an optical transmittance changes (ΔT) of 22.65% and 31.4% at 550 and 700 nm, respectively, with the rapid response time of about 8.2 s for coloration and 6.3 s for bleaching. The advantages, such as large optical transmittance changes, rapid electrochromism control speed, and excellent cycle durability, demonstrated in the electrochromic cell proves the potential application of MoO3/V2O5 hybrid nanobilayers in electrochromic devices.

Highlights

IntroductionElectrochromic properties of transition metal oxides have received much attention in recent years
Electrochromic properties of transition metal oxides have received much attention in recent years.The electrochromic thin films are useful for applications such as automobile, batteries, and smart windows [1,2,3,4,5,6]
All the samples is large except for. This may be attributed the coalescence of electrochromic window of all the samples is large for V350. This maytobe attributed to the particles in the film structure during heat treatment, which led to the formation of different surface coalescence of particles in the film structure during heat treatment, which led to the formation of morphology andmorphology scattered or and trapped the light

Summary

Introduction

Electrochromic properties of transition metal oxides have received much attention in recent years. Kharade et al prepared WO3 /MoO3 hybrid by combining the sol–gel method along with thermal evaporation wherein the mixing and formation of hybrid oxide occurred during the annealing process. According to their result, the coloration efficiency and response time of electrochromic thin films could be improved, the exact role of the MoO3 was still not very clear [22]. Instead of a doping or mixing process, the combination of MoO3 -V2 O5 layer structure was modified so as to capitalize their best electrochemical properties from each layer [23,24]. This study extends the scope of the potential applications of the MoO3 /V2 O5 hybrid nanobilayers and provides the new concepts and interesting applications of electrochromism

Materials and Methods

Results and Discussion

Transmittances

Transmittance

Conclusions