Electrodeposition of Ni-Al layered double hydroxide thin films having an inversed opal structure: Application as electrochromic coatings
Electrodeposition of Ni-Al layered double hydroxide thin films having an inversed opal structure: Application as electrochromic coatings
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DOI：
10.1016/j.jelechem.2016.09.022
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发表时间：
2016-11-01
影响因子：
4.5
通讯作者：
Villemure, Gilles
中科院分区：
文献类型：
--
作者：
Martin, Julian;Jack, Miranda;Villemure, Gilles
对单分散聚苯乙烯珠的悬浮液施加正电势会导致厚度均匀的合成蛋白石涂层的电泳沉积，该涂层由基本上完整的珠单层的大区域组成，以近乎完美的六边形顺序排列。这些胶体模板用于从镍离子和铝离子在硝酸钾乙醇水溶液的混合溶液中电化学诱导沉淀 Ni-AI-LDH。用有机溶剂萃取留下扭曲的反蛋白石涂层，该涂层由围绕大型互连空腔的 Ni-Al-LDH 框架组成。在足够高的温度（>350摄氏度）下，薄膜的3维有序结构经受住了涂层的不变加热，以将氢氧化物涂层完全转化为相应的混合氧化物。结构水损失时氢氧化物涂层的收缩对反蛋白石结构薄膜没有明显影响。电位循环过程中薄膜紫外-可见光谱的原位测量表明，与相同条件下制备的非蛋白石结构 Ni-Al-LDH 涂层相比，反蛋白石 N-Al-LDH 涂层的透光率变化更大（Delta T >20%）（Delta T >20%）。 约5%）。然而，反蛋白石结构的引入并没有太大影响颜色变化的可逆性。连续电位循环后，两种薄膜都会迅速变暗。当薄膜在足够高的温度下加热以将 Ni-Al LDH 转化为相应的混合氧化物时，颜色变化的可逆性大大提高。 (C) 2016 Elsevier B.V. 保留所有权利。
Application of a positive potential to suspensions of mono-dispersed polystyrene beads results in electrophoretic deposition of synthetic opal coatings of uniform thickness, consisting of large domains of essentially complete monolayers of the beads, arranged in nearly perfect hexagonal order. These colloidal templates were used for electrochemically induced precipitation of Ni-AI-LDHs from mixed solution of nickel and aluminum ions in potassium nitrate in ethanol-water solutions. Extractions with organic solvents left behind distorted inverse opal coatings consisting of a Ni-Al-LDH framework surrounding large interconnected cavities. The films 3-dimensional ordered structure survived unchanged heating of the coatings at temperatures high enough (>350 degrees C) to completely convert the hydroxide coatings into the corresponding mix oxides. The shrinkage of the hydroxide coatings upon loss of structural water had no visible effect of the films inverse opal structure.In situ measurements of the UV-visible spectra of the films during potential cycling show greater transmittance changes (Delta T >20%) were obtained for the inverse opal N-Al-LDH coatings compared with non-opal structure Ni-Al-LDH coatings prepared in the same conditions (Delta T approximate to 5%). However, introduction of the inverse opal structure did not much affect the reversibility of the color changes. Both films darken rapidly upon continuous potential cycling. Reversibility of the color change was greatly improved when the film were heated at a temperature high enough to convert the Ni-Al LDH to the corresponding mix oxides. (C) 2016 Elsevier B.V. All rights reserved.