Amorphous‐Crystalline Interface Induced Internal Electric Fields for Electrochromic Smart Window
Balancing optical modulation and response time is crucial for achieving high coloration efficiency in electrochromic materials. Here, internal electric fields are introduced to titanium dioxide nanosheets by constructing abundant amorphous‐crystalline interfaces, ensuring large optical modulation wh...
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Veröffentlicht in: | Advanced materials (Weinheim) 2024-11, Vol.36 (47), p.e2410355-n/a |
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Sprache: | eng |
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Zusammenfassung: | Balancing optical modulation and response time is crucial for achieving high coloration efficiency in electrochromic materials. Here, internal electric fields are introduced to titanium dioxide nanosheets by constructing abundant amorphous‐crystalline interfaces, ensuring large optical modulation while reducing response time and therefore improving coloration efficiency. Aberration‐corrected high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) reveals the presence of numerous amorphous‐crystalline phase boundaries in titanium dioxide nanosheets. Kelvin probe force microscopy (KPFM) exhibits an intense surface potential distribution, demonstrating the presence of internal electric fields. Density functional theory (DFT) calculations confirm that the amorphous‐crystalline heterointerfaces can generate internal electric fields and reduce diffusion barriers of lithium ions. As a result, the amorphous‐crystalline titanium dioxide nanosheets exhibit better coloration efficiency (35.1 cm2 C−1) than pure amorphous and crystalline titanium dioxide nanosheets.
TiO2 nanosheets with abundant amorphous/crystalline heterointerfaces (A/C‐TiO2) are constructed. The alignment of Fermi levels of amorphous and crystalline TiO2 domains can introduce an internal electric field and therefore reduce the diffusion energy barrier of Li+. Consequently, it shortens the response time and improves the coloration efficiency. |
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ISSN: | 0935-9648 1521-4095 1521-4095 |
DOI: | 10.1002/adma.202410355 |