Morphological evolution of electrochromic nanosheet-structured nickel-cobalt oxide thin films
Morphological evolution of electrochromic nanosheet-structured nickel-cobalt oxide thin films
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DOI：
10.1016/j.matlet.2022.133192
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发表时间：
2022-09
影响因子：
3
通讯作者：
K. Kim;Kodai Numata;Misaki Morohoshi;Y. Abe
中科院分区：
文献类型：
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作者：
K. Kim;Kodai Numata;Misaki Morohoshi;Y. Abe
使用简便的一锅溶液法，在掺氟氧化锡（FTO）涂层的玻璃基板上直接生长纳米片结构的镍钴（Ni-Co）氧化物薄膜。氧化物薄膜由宽度为几个纳米量级的互连纳米片组成，随着生长时间的增加，它们的结构得到了很好的保存。此外，通过将六亚甲基四胺 (HMT) 的量增加到 20 mM，可以增强在 FTO/玻璃基板上垂直排列的纳米片的生长。随后，当 HMT 量进一步增加至 50 mM 时，它略有下降，并且松散堆积的纳米片分布稀疏。使用 20 mM HMT 制备的 Ni-Co 氧化物样品在相对较高的循环伏安 (CV) 扫描速率（50 mV/s，1000 个循环）下表现出从黑色到黄色的可染色且可逆的颜色调制。它还具有小于 ∼4 秒的快速切换时间，并且在开路条件下具有出色的保色性。
Nanosheet-structured nickel-cobalt (Ni-Co) oxide thin films were directly grown on the fluorine-doped tin oxide (FTO)-coated glass substrates using a facile one-pot solution method. The oxide thin films were composed of interconnected nanosheets with several nanometer order in width, and their structures were well-preserved with the increase in the growth time. Furthermore, the growth of nanosheets that were vertically aligned on the FTO/glass substrate was enhanced by increasing the amount of hexamethylenetetramine (HMT) to 20 mM. Subsequently, it slightly decreased when the HMT amount was further increased to 50 mM, and the loose-packed nanosheets were sparely distributed. The Ni-Co oxide sample prepared with 20 mM HMT exhibited a stainable and reversible color modulation from black to yellow under a relatively high cyclic voltammetry (CV) scan rate (50 mV/s, 1000 cycle). It also had a fast switching time less than ∼4 s with excellent color retention in an open-circuit condition.