Bilayer structure niobium oxide/titanium oxide film with improved electrochromism

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2025-01-01 Epub Date: 2024-11-29 DOI:10.1016/j.optmat.2024.116505

Hui Wang , Lei Chen , Xiangfei Wei , Hongquan Zhao , Bo Zhang

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Abstract

A combination of simple hydrothermal and electrodeposition techniques is proposed for the synthesis of niobium oxide/titanium oxide (Nb₂O₅/TiO₂) bilayer films, which can improve the electrochromic performance for niobium oxide (Nb₂O₅)-based materials, including response time, cycle stability, coloration efficiency and optical properties. The structure, morphology, electrochemical and electrochromic performance of the Nb₂O₅/TiO₂ film are improved via the systematic study of TiO₂ electrodeposition period. X-ray diffraction shows that TiO₂ is amorphous and Nb₂O₅ is orthogonal. The vibration modes and structural properties are studied by the Raman spectroscopy. The chemical compositions, elemental states, and surface features are studied via the X-ray photoelectron spectroscopy. The effects of TiO₂ electrodeposition periods on the morphology of Nb₂O₅/TiO₂ films are analyzed by the field emission scanning electron microscopy. These results show that NTO-20 film has high efficiency Li⁺ reaction kinetics, which shows remarkable electrochromic properties, including wide transmittance modulation (76.94 %), good reversibility (98.15 %), large coloration efficiency (91.6 cm²/C) and high cycle stability. For the electrochromic device with NTO-20 film, it shows conspicuous transmittance modulation (69.1 %) and excellent cycle stability. Thus, Nb₂O₅/TiO₂ bilayer films have important research value in the field of electrochromism.

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提高电致变色性能的双层结构氧化铌/氧化钛薄膜

采用简单的水热和电沉积相结合的方法合成氧化铌/氧化钛（Nb2O5/TiO2）双层膜，提高了氧化铌（Nb2O5）基材料的电致变色性能，包括响应时间、循环稳定性、显色效率和光学性能。通过对TiO2电沉积时间的系统研究，改善了Nb2O5/TiO2薄膜的结构、形貌、电化学和电致变色性能。x射线衍射表明TiO2为无定形，Nb2O5为正交态。利用拉曼光谱对其振动模式和结构特性进行了研究。通过x射线光电子能谱研究了其化学组成、元素状态和表面特征。采用场发射扫描电镜分析了TiO2电沉积时间对Nb2O5/TiO2薄膜形貌的影响。结果表明，NTO-20薄膜具有高效的Li+反应动力学，具有明显的电致变色性能，包括宽透过率调制（76.94%）、好可逆性（98.15%）、显色效率（91.6 cm2/C）和高循环稳定性。采用NTO-20薄膜制备的电致变色器件具有明显的透过率调制（69.1%）和良好的周期稳定性。因此，Nb2O5/TiO2双层膜在电致变色领域具有重要的研究价值。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.