高暴露（002）晶面的氧化钨电致变色薄膜，用醋酸铈进行掺杂和调制。

Electrochromic thin films of tungsten oxide with high-exposure (002) crystal faces doped and modulated with cerium acetate.

作者信息

Nie Shanshan, Wang Chengyi, Zhou Miao, Lian Yi, Liu Jie, Ruan Mengnan, Liu Zhifeng

机构信息

School of Materials Science and Engineering, Tianjin Chengjian University, 300384, Tianjin, China.

Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, 300384, Tianjin, China.

出版信息

Nanoscale. 2025 Mar 7;17(10):6090-6102. doi: 10.1039/d4nr05095a.

DOI:10.1039/d4nr05095a

PMID:39932072

Abstract

The electrochromic layer is the key part of the electrochromic device, and it is usually necessary to introduce nanomaterials or other functional materials to improve the response speed and stability. In this paper, a cerium acetate-doped tungsten oxide film (WO-CA) prepared by a hydrothermal and annealing method is presented and compared with a pure tungsten oxide film (WO) and an acetate-doped tungsten oxide film (WO-HAC) in terms of electrochromic performance. The electrochemical analysis results show that the Li diffusion rate of the WO-CA film is 37.36 × 10 cm s, which is 2.6 and 2.2 times higher than that of pure WO (14.21 × 10 cm s) and WO-HAC (16.93 × 10 cm s), respectively. Combined with density-functional theory (DFT) simulations, it was investigated whether the introduction of cerium acetate forms new Ce-O coordination bonds with oxygen atoms in WO and exposes more (002) crystal faces. In addition, the introduction of acetate ions also contributes to the improvement of the structural stability and electrochemical properties of the films, which promotes the enhancement of the electrochromic effect. This mechanism provides a new idea for optimizing electrochromic materials.

摘要

电致变色层是电致变色器件的关键部分，通常需要引入纳米材料或其他功能材料来提高响应速度和稳定性。本文介绍了一种通过水热和退火方法制备的醋酸铈掺杂氧化钨薄膜（WO-CA），并在电致变色性能方面将其与纯氧化钨薄膜（WO）和醋酸掺杂氧化钨薄膜（WO-HAC）进行了比较。电化学分析结果表明，WO-CA薄膜的Li扩散速率为37.36×10⁻⁹ cm² s⁻¹，分别比纯WO薄膜（14.21×10⁻⁹ cm² s⁻¹）和WO-HAC薄膜（16.93×10⁻⁹ cm² s⁻¹）高2.6倍和2.2倍。结合密度泛函理论（DFT）模拟，研究了醋酸铈的引入是否会与WO中的氧原子形成新的Ce-O配位键并暴露出更多的（002）晶面。此外，醋酸根离子的引入也有助于提高薄膜的结构稳定性和电化学性能，从而促进电致变色效应的增强。该机理为优化电致变色材料提供了新思路。