Enhanced electrochromic properties of ordered porous nickel oxide thin film prepared by self-assembled colloidal crystal template-assisted electrodeposition
Enhanced electrochromic properties of ordered porous nickel oxide thin film prepared by self-assembled colloidal crystal template-assisted electrodeposition
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DOI：
10.1016/j.electacta.2010.10.097
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发表时间：
2011
影响因子：
6.6
通讯作者：
Yongfeng Yuan;X. Xia;J. Wu;Y. Chen;J. Yang;S. Guo
中科院分区：
文献类型：
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作者：
Yongfeng Yuan;X. Xia;J. Wu;Y. Chen;J. Yang;S. Guo
采用自组装单层聚苯乙烯球模板辅助电沉积法制备了高度有序的多孔NiO薄膜。所制备的NiO薄膜呈六方密排的有序肠状阵列，由直径约500 nm的大碗组成。采用透射率、循环伏安和计时电流法研究了NiO薄膜在碱性电解液（0.1M KOH）中的电致变色性能。以PS球为模板制备的有序多孔NiO薄膜具有明显的电致变色性，其颜色从透明到深棕色可逆变化，并具有很好的透射率调制性，在550 nm处的透射率变化率高达76%。与未使用PS球模板制备的致密NiO膜相比，有序多孔NiO膜还显示出高的着色效率（41 cm ~ 2C-1）、快的开关速度（3s和6s）和良好的循环性能。电致变色性能的改善归因于高度多孔的形貌，其缩短了离子扩散路径并提供了更大的表面积。
Highly ordered porous NiO film is prepared by self-assembled monolayer polystyrene sphere template-assisted electrodeposition. The as-prepared NiO film shows an ordered hexagonal close-packed bowel-like array that is made up of macrobowls with about 500nm in diameter. The electrochromic properties of NiO film are investigated in an aqueous alkaline electrolyte (0.1M KOH) by means of transmittance, cyclic voltammetry and chronoamperometry measurements. The ordered porous NiO film prepared with PS sphere template exhibits a noticeable electrochromism with reversible color changes from transparent to dark brown, and presents quite good transmittance modulation with a variation of transmittance up to 76% at 550nm. The ordered porous NiO film also shows high coloration efficiency (41cm2C−1), fast switching speed (3s and 6s) and good cycling performance, compared with the dense NiO film prepared without PS sphere template. The improvements of electrochromic performances are attributed to the highly porous morphology, which shortens the ion diffusion paths and provides bigger surface area.