question regarding the electrochromism of NiO in Li+ electrolyte. I prepared NiO thin film on FTO/glass by electrodeposition, and then activated the NiO in either Lithium perchlorate in PC with the application of a small current (around 2 uA/cm2, galvanostatic) for Li+ intercalation to activate the NiO, or CV cycling in 1M KOH for activation, then tried CV for electrochromic effect in 1M LiClO4-PC electrolyte, but the optical modulation was really low (around 2-3%), however, if I use 1M KOH as the electrolyte, the optical modulation was all good, does anybody know how can I obtain high optical modulation of NiO in Li+ electrolyte? thanks
When you try to deposit electrochromic film from nitrate or sulfate solution you obtain ONLY Ni(OH)2, maybe you should do annealing it to obtain NiO? Some authors use 400oC for annealing.
Hi
Dear Weimin Zhu,
It is possible that your surface morphology is not suitable to transfer big ions such as lithium and potassium. you can try to use hydrogen ions as electrolyte, for example 0.5 M H2SO4. If you don't good result, you must try to fabricate the porous surfaces.
Sulfuric acid will completely dissolve nickel hydroxide or oxide film.
NiO electrochromic thin film prepared by alot of methods like electron beam evaporator, thermal evaporation with these methods you obtain directly NiO thin film. If you prepare the film by spray pyrolysis technique or electrodeposition method, you need annealing the film after deposition to get NiO thin film with good adhesion to the substrate.
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