Some Effects of Co on the Electrochromic Properties of NiOx Hy Film

Some effect s of Co addition upon t he elect rochromic characteristics of a nic- kel hydroxide film were st udied. The films were elect rodeposited on bot h polished Ni plate and conductive I TO glass. The elect rochemical behaviors were investigated using t he film on Ni plate by linear potential sweep , a. c. impedance , and anodic polarization curves for O ER (oxygen evolu2 tion reaction) . It was found t hat Co can lower t he working voltage and raise t he oxygen overpo2 tential , but has little effect on t he reaction kinetics. It was also found t hat t he Co can improve t he optical properties of t he elect rochromic film.