Defect engineering of W6+-doped NiO for high-performance black smart windows

In this report, W 6+ doping as a defect engineering strategy has been proposed to improve the electrochromic properties of NiO film. Further research was conducted to explore the electrochromic properties and the modified mechanism of W-doped NiO film. Compared to the pure NiO, W-doped NiO film exhi...

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Bibliographic Details
Published in:Nano research 2024-04, Vol.17 (4), p.3043-3052
Main Authors: Xiao, Yingjun, Zhang, Xiang, Yan, Dukang, Deng, Jianbo, Chen, Mingjun, Zhang, Hulin, Sun, Wenhai, Zhao, Jiupeng, Li, Yao
Format: Article
Language:English
Subjects:
Anodes
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Bleaching
Chemistry and Materials Science
Condensed Matter Physics
Conductivity
Defects
Density functional theory
Electrochromism
Electrode materials
Electrolytes
Energy storage
Engineering
Light modulation
Materials Science
Mirrors
Nanotechnology
Nickel
Nickel oxides
Optical properties
Research Article
Smart materials
Thin films
Windows (apertures)
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Summary:In this report, W 6+ doping as a defect engineering strategy has been proposed to improve the electrochromic properties of NiO film. Further research was conducted to explore the electrochromic properties and the modified mechanism of W-doped NiO film. Compared to the pure NiO, W-doped NiO film exhibits improved electrochromic properties with significant optical modulation (61.56% at 550 nm), fast switching speed (4.42 s/1.40 s for coloring/bleaching), high coloration efficiency (45.41 cm 2 ·C −1 ) and outstanding cycling stability (no significant attenuation after 2000 cycles) in Li-based electrolytes. Density functional theory (DFT) calculations combined with the experimental results indicate that the improved electrochromic properties were due to enhanced the electronic conductivity and ion conductivity after the introduction of W 6+ . The charge capacity of W-doped NiO has also been improved, and it can function with WO 3 to achieve a high performance black electrochromic smart window (ECSW) by balancing charge. This work could advance the fundamental understanding of defect engineering as an effective strategy to boost the electrochromic properties of NiO anodic material, manifesting a significant development as a candidate counter electrode in high-performance black smart windows.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-023-6106-z