A study of multilayered electrochromic platings based on nickel and cobalt hydroxides

Abstract

Запропоновано отримання багатошарових електрохромних плівок на основі Ni(OH) 2 і Co(OH) 2 катодним темплатним методом. Отримані плівки показали електрохімічну активність і електрохромні властивості. Найкращі електрохромні характеристики показала плівка, яку отримували послідовно в розчинах із додаванням полівінілового спирту, що містять нітрат кобальту і нікелю 2 і 78 хвилин відповідно Ключові слова: Ni(OH) 2 , Co(OH) 2 , електрохромізм, електрохромні матеріали, CoOOH, полівіниловый спирт, багатошарові покриття Предложено получение многослойных электрохромных пленок на основе Ni(OH) 2 и Co(OH) 2 катодным темплатным методом. Полученные пленки показали электрохимическую активность и электрохромные свойства. Наилучшие электрохромные характеристики показала пленка, которую получали последовательно в растворах сдобавлением поливинилового спирта, содержащих нитрат кобальта и никеля 2 и 78 минут соответственно Ключевые слова: Ni(OH) 2 , Co(OH) 2 , электрохромизм, электрохромные материалы, CoOOH, поливиниловый спирт, многослойные покрытия

The effect of template residual content on supercapacitive characteristics of Ni(OH)2, obtained by template homogeneous precipitation

“…PVA is used as a porosity-controlling agent in the synthesis of mesoporous alumina oxide [37], hydroxyapatite crystals (along with sodium dodecyl sulfate) [38]. PVA is also used for the synthesis of MFI zeolite [39]; MgO for dye removal from wastewater [40], formation of single-layer [41,42] and multilayer [43] hydroxide films, preparation of 3D-structured macroporous oxides and hierarchic zeolites [44], as well as for improving the adhesion of coatings on the ITO surface [45]. The paper [46] describes the high effectiveness of cellulose ether Culminal C8465 as a template.…”

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

“…The next problem to solve is which additives can be used to improve film adhesion to the substrate that can also be served over a wide range of temperatures. The latter is partially solved by the authors in [7,12,13,16]. Wide temperature range is required because the absorbed light would be transformed into heat, which can result in the film temperature rising up to 80 °С and more.…”

“…The following solutions were used for deposition: 1, 0.1 and 0.01 М Ni(NO 3 ) 2 . It should be noted that unlike in previous works, the electrolyte did not contain any additives [6,7,[11][12][13]16]. This is necessary to isolate the influence of additives from the main processes.…”

“…Nickel (II) hydroxide is anodic electrochromic material that changes color from transparent to dark-brown upon oxidation [6,7]. Anodic oxidation of nickel hydroxide occurs according to the solid-state reaction (1), which results in a transition from Ni(OH) 2 into nickel oxyhydroxide -NiOOH [7]:…”

Definition of the influence of obtaining method on physical and chemical characteristics of Ni (OH)2 powders

“…Precipitation of nickel hydroxide with different additives is viewed as one way for the preparation of electrodes for water decomposition [5,6]. Thin films of nickel hydroxide can be potentially applied as electrochromes in smart windows [7,8]. Precipitation of nickel hydroxide can be realized through many methods [9], with synthesis conditions varying significantly.…”