Dear sir...  your question is not clear  but the following are useful for you according to my understood of your quastion

http://scholarworks.rit.edu/cgi/viewcontent.cgi?article=2241&context=theses

http://pubs.rsc.org/-/content/articlelanding/2016/cp/c5cp04183j/unauth#!divAbstrac

file:///C:/Users/High%20Spec/Downloads/CharacterizationofGold-SputteredZincOxideNanorodsaPotentialHybridMaterial.pdf

also this video is more important

https://www.youtube.com/watch?v=noHrDL3YUhE

Most probably the answer i no, because you need to have two or more oxidation states of the zinc atom with different color. Electrochromism is a phenomenon where you have to have a simultaneous changes in color while changing the applied potential and/or polarity in the electrochromic system that will lead to transformation from one into another oxidation state.

Thanks to all contributors for your valuable support. 

My question was that I want to use the ZnO thin film as an active material on the ITO coated glass substrate for electrochromism. But the oxidation-reduction cyclic of ZnO is not good.Finally, I want to know the actual requirement of a material for electrochromism. 

Dear  Anwer Kakil, I know the synthesis process of ZnO thin film by sputtering. I only want to know the actual mechanism of electrochromism for choosing the materials. 

The actual mechanism is that you have to have more oxidation states of the Zn atom that are colored differently (for each oxidation state) in order to achieve electrochromism. You won't be able to do that with ZnO. Chose another element such as Ni, V, Mn, W, Fe, Nb...and synthesize compounds like oxides and you will achieve electrochromism with that kind of materials and of course suitable electrolyte.

Thanks, Dear Stojkovikj.

You are welcome,

best regars