Abstract
Nickel hydroxide has two important crystal forms, α-Ni(OH)2 and β-Ni(OH)2. α-Ni(OH)2 is appropriate for application in electrochromic devices due to the reversible and efficient redox process between Ni2+ and Ni3+. In this research, a stable sol with dispersion of α and β-Ni(OH)2 nanoparticles was obtained by dialysis of a mixed aqueous solution of Ni(NO3)2 and NH3. The addition of sorbitol into the aqueous solution of Ni(NO3)2 enhanced the formation ratio of α-Ni(OH)2 when the concentration of sorbitol ([sorbitol]) was more than 0.05 mol/L. A stable sol containing single-phase α-Ni(OH)2 was obtained. α-Ni(OH)2 has a wide interlayer spacing to enable reversible sorption and desorption of important anions such as hydroxide (OH-) and nitrate ions (NO3-) for redox processes involving Ni ions. Furthermore, the sorbitol molecules adsorbed on the surface of the α-Ni(OH)2 particles, thus increasing the hydrophilicity of the Ni(OH)2 nanoparticles to improve the stability of the sol. The optical transmittance of the sol was more than 90% at 500 nm, which indicates that it contained no aggregated particles to cause light scattering. The α-Ni(OH)2 sol enabled the preparation of thin film by drying the sol on a glass substrate. The resulting α-Ni(OH)2 thin films showed reversible electrochromic characteristics. Accordingly, the hydrolysis reactions of Ni ions in aqueous solution with sorbitol formed a stable sol of α-Ni(OH)2 nanoparticles which gave good electrochromic thin films.
Graphical Abstract
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Electrochromic characteristics of the Ni(OH)2 thin film prepated by drying the sol obtaied by hydrolysis reaction of Ni(NO3)2 aqueous solution with NH3 aq. and sorbitol.
Highlights
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α-Ni(OH)2 nanoparticles were obtained by dialysis of Ni(NO3)2 solution with sorbitol and NH3 aq.
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α-Ni(OH)2 thin films with (003) crystallite orientation were obtained by drying the sol on glass substrates.
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α-Ni(OH)2 thin films showed reversible electrochromism by supplying electric potential in the range from 0 V to 0.8 V.
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Acknowledgements
This work was supported by JSPS KAKENHI (grant number 19K05013).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by YS, TK, and NU. The first draft of this manuscript was written by YS and NU and all authors commented on the previous version of the manuscript. All authors read and approved the final manuscript.
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This work was supported by JSPS KAKENHI (grant number 19K05013).
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Sasamura, Y., Kojima, T. & Uekawa, N. Preparation of electrochromic nickel hydroxide (II) thin film by drying sol obtained by dialysis of solution with precipitate formed from nickel nitrate aqueous solution with ammonia and sorbitol. J Sol-Gel Sci Technol 108, 588–597 (2023). https://doi.org/10.1007/s10971-023-06244-1
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DOI: https://doi.org/10.1007/s10971-023-06244-1