Optimization of the deposition conditions for Ni(OH)2 films for electrochromic elements of “smart” windows

Kotok, Valerii; Кovalenko, Vadym

doi:10.15587/1729-4061.2019.162572

Cited by 4 publications

(7 citation statements)

References 20 publications

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“…[223] It was proposed to use two water-soluble polymers, polyvinyl alcohol, and polyvinylpyrrolidone. [224] To improve the characteristics of nickel hydroxide films, it was proposed to use activating additives of tungstate anion, [225,227] aluminum, [226,227] and manganese [226,228] cations. Optimization of electrolyte composition [229] and the deposition conditions [230] was carried out.…”

Section: Elecrtochromic Devices (Smart Windows)mentioning

confidence: 99%

Nickel Hydroxides: Requirements, Targeted Construction and Choice of Characteristics and Industrially Applicable Synthesis for Targeted Use in Electrochemical Devices

Kovalenko,

Kotok

2024

ChemistrySelect

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Nickel hydroxides (monohydroxides of several modifications and layered double hydroxides, based on nickel hydroxide) have high electrochemical, electrochromic, and electrocatalytic properties that allow them to be effectively used as an active substance in alkaline batteries, hybrid supercapacitors, electrochemical sensors, for electrocatalytic oxidation of organic substances and as an electrochromic device. Each application has its specific requirements for nickel hydroxides which must be defined. For an effective application, it is necessary to carry out a targeted construction of structure and composition, and selection of characteristics of nickel hydroxides and to develop targeted methods and conditions for nickel hydroxide synthesis. The structure, properties, and methods of preparation for use in various fields of nickel hydroxide application have been considered from the targeted ternary points of view: requirements definition, types and characteristics selection, and applying the synthesis method in industry. The 3‐level hierarchical complex of mechanisms for the formation of nickel hydroxides has been described. Also, the contribution of Ukrainian scientists to research in the field of nickel hydroxides is considered.

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Section: Elecrtochromic Devices (Smart Windows)mentioning

confidence: 99%

Nickel Hydroxides: Requirements, Targeted Construction and Choice of Characteristics and Industrially Applicable Synthesis for Targeted Use in Electrochemical Devices

Kovalenko,

Kotok

2024

ChemistrySelect

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“…It should be noted separately that the deposition duration and current density were chosen based on the literature data for electrochemical deposition from 0.01 M Ni(NO 3 ) 2 without the addition of PVA and PVP [25], as well as according to the optimized values for cathodic template deposition from solutions of 0.01 M Ni(NO 3 ) 2 with PVA [26,27].…”

Section: Materials Used and Technique For Obtaining Electrochromic Filmsmentioning

confidence: 99%

“…A comparison of the obtained impedance characteristics revealed that all electrodes differed significantly from each other in properties. To analyze the impedance characteristics of the electrodes, we chose an equivalent model used in studies related to the formation of oxide and hydroxide electrochromic films [25][26][27]. In the circuit, R1 is the charge transfer resistance, R2 is the uncompensated electrolyte resistance, W1 is the Warburg impedance, and C1 is the electric double layer capacitance.…”

Section: Investigation Of Electrochemical Properties Of Ni(oh) 2 -Pol...mentioning

confidence: 99%

Characteristics investigation of composite electrochromic films based on Ni(Oh)2, polyvinyl alcohol, and polyvinylpyrrolidone

Kotok

Кovalenko

Mikolášek

et al. 2022

EEJET

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The cost of electrochromic “smart” windows ranges from 200–800 USD/m2. The high cost is determined by the small volume of production and the high cost of vacuum methods for applying device layers. The development of other methods could lead to lower costs and further mass use of “smart” windows. The paper presents the work on improving the electrochemical method of deposition of electrochromic films based on Ni(OH)2. Composite electrochromic films were deposited from Ni(NO3)2 solutions with the addition of water-soluble polymers – polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and mixtures thereof. Two PVA grades and one PVP grade were used in the experiments. As a result, six films were obtained from solutions of different compositions and concentrations of polymers. An investigation of the optical properties of the films in the initial state showed that there is no intense absorption of light in the entire visible spectrum and the transmission corresponds to a glass substrate. Thus, the formed electrochromic films will not produce tints and visible light absorption in the finished electrochromic element. The electrochemical and electrochromic characteristics of the films differed significantly depending on the amount and specific polymers used. The film obtained from a solution containing PVA grade 24-99 was the most electrochemically active, while the best electrochromic characteristics were in the film deposited from a solution of a mixture of PVP grade 24-99 and PVP. Moreover, the films obtained in solutions containing separately PVA grade 24-99 and PVP had worse electrochromic characteristics, and the electrochemical characteristics were the same or worse relative to the film obtained in a mixture of polymers. The results of the method of electrochemical impedance spectroscopy showed compliance with the found electrochromic and electrochemical characteristics of the formed films.

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“…Thin films of Ni(OH) 2 are a promising inorganic material due to high specific electrochromic characteristics [15,16]. Nevertheless, these characteristics can be improved with the formation of layered double hydroxides, composite materials.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The study of activation impact during formation and testing of Ni(OH)2 electrochromic films in the presence of Al3+ and WO42- ions

Kotok

Кovalenko

Kovalenko

et al. 2019

EEJET

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Optimization of the deposition conditions for Ni(OH)2 films for electrochromic elements of “smart” windows

Cited by 4 publications

References 20 publications

Nickel Hydroxides: Requirements, Targeted Construction and Choice of Characteristics and Industrially Applicable Synthesis for Targeted Use in Electrochemical Devices

Nickel Hydroxides: Requirements, Targeted Construction and Choice of Characteristics and Industrially Applicable Synthesis for Targeted Use in Electrochemical Devices

Characteristics investigation of composite electrochromic films based on Ni(Oh)2, polyvinyl alcohol, and polyvinylpyrrolidone

The study of activation impact during formation and testing of Ni(OH)2 electrochromic films in the presence of Al3+ and WO42- ions

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