Development of laminated nickel/manganese oxide and nickel/niobium oxide electrochromic devices

摘要

This paper reports on the preparation, electrical, and optical analysis of electrodes and prototype electrochromic devices using a solid polymer ion conductor. For these devices electrodes were developed consisting of cobalt-doped nickel oxide, manganese-nickel oxide, and niobium oxide. Optical and voltammetric data was obtained for each electrode. Solid polymer electrolytes were synthesized from modified amorphous poly(ethylene oxide) [a-PEO] complexed with a metal silicate. Electrochromic devices were made using cobalt-doped nickel oxide/niobium oxide, and cobalt-doped nickel oxide/manganese-nickel electrode laminations. Optical spectra as a function of voltage was obtained for each device. The best cobalt-doped nickel oxide/a-PEO/manganese-nickel oxide device showed photopic transmittance to be T$- p$/(bleached) $EQ 0.76 and T$-p$/(colored) $EQ 0.44. The corresponding integrated solar transmittance was T$-s$/(bleached) $EQ 0.64, T$-s$/(colored) $EQ 0.46. The best cobalt- doped nickel oxide/a-PEO/niobium oxide device had photopic transmittance of T$- p$/(bleached) $EQ 0.65 and T$-p$/(colored) $EQ 0.16. The corresponding integrated solar transmittance was T$-s$/(bleached) $EQ 0.45 and T$-s$/(colored) $EQ 0.15. Of the two devices, the nickel/niobium oxide device had the best combination of electrical and optical properties. Better device properties are expected with improvements in the solid polymer electrolyte and lamination process.