Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 2, Pages 301-309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am302097b
Keywords
lithium; nickel oxide; ozone; electrochromic; oxidation state; aluminum
Funding
- U.S. Department of Energy [DE-AC36-08-GO28308]
- U.S. Department of Energy
- National Renewable Energy Laboratory as part of the DOE Office of Energy Efficiency and Renewable Energy Office of Building Technologies Program
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Electrochromic materials exhibit switchable optical properties that can find applications in various fields, including smart windows, nonemissive displays, and semiconductors. High-performing nickel oxide electrochromic materials have been realized by controlling the material composition and tuning the nanostructural morphology. Post-treatment techniques could represent efficient and cost-effective approaches for performance enhancement. Herein, we report on a post-processing ozone technique that improves the electrochromic performance of an aluminum-containing nickel oxide material in lithium-ion electrolytes. The resulting materials were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible-near-infrared (UV-vis-NIR) spectroscopy, and X-ray absorption spectroscopy (XAS). It was observed that ozone exposure increased the Ni oxidation state by introducing hole states in the NiO6 octahedral unit. In addition, ozone exposure gives rise to higher-performing aluminum-containing nickel oxide films, relative to nickel oxide containing both Al and Li, in terms of switching kinetics, bleached-state transparency, and optical modulation. The improved performance is attributed to the decreased crystallinity and increased nickel oxidation state in aluminum-containing nickel oxide electrochromic films. The present study provides an alternative route to improve electrochromic performance for nickel oxide materials.
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