Improvement in Electrochromic Stability of Electrodeposited Nickel Hydroxide Thin Film

Abstract

The electrochromic nickel hydroxide thin film was anodically deposited from an aqueous solution. The effect of solution temperature, postheat‐treatment temperature, and addition of cadmium on the electrochromic behavior (color/bleach durability cycle, response time, and coloration efficiency of the nickel hydroxide films in NaOH) were investigated. A significant increase in the color/bleach durability cycle from 500 (for the as‐deposited film) to more than 5000 cycles (for the heat‐treated film) was observed. The addition of cadmium increased the utilization of the active materials. It was found that the coloration efficiency was 40 cm2/C and coloration and bleaching response time were 20 to 30 s and 8 to 10 s, respectively. The change in the electrochromic properties with heat‐treatment temperature is discussed based on the physical and electrochemical analysis.

Studies on the Capacitance of Nickel Oxide Films: Effect of Heating Temperature and Electrolyte Concentration

“…When the film is heated to ϳ300ЊC or above, the hydroxide is converted to the oxide 18,19 and the film becomes stoichiometric NiO. The conversion at ϳ300ЊC has been shown previously to lead to a significant improvement in the cycle life 12,19 of these materials and a decrease in the optical response.…”

Vertically aligned and interconnected nickel oxide nanowalls fabricated by hydrothermal route

“…Synthesis of nickel oxide nanostructures of various shapes and sizes including nanoparticles, nanorods, nanowires, nanosheets, etc., have been attempted by employing different fabrication methods such as spray pyrolysis [13], sol-gel technique [14], electrodeposition [15], and hydrothermal method [16]. However, synthesis of vertically aligned 2D nanostructures of NiO has been seldom reported [11,12,17].…”

Pseudo-capacitance properties of porous metal oxide nanoplatelets derived from hydrotalcite-like compounds

“…Nickel oxides as pseudo-capacitor electrode materials have been synthesized using different techniques such as evaporation, coprecipitation, sol-gel techniques, sputtering and electrodeposition [12][13][14]. Liu et al [15] synthesized porous nickel oxide films with the sol-gel process, but the films could only provide a specific capacitance of 50-64 F g -1 .…”