Amorphous-Crystalline Interface Induced Internal Electric Fields for Electrochromic Smart Window

IF 6.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Analytical Chemistry Pub Date : 2024-09-30 DOI:10.1002/adma.202410355

Shi Zhang, Xiao Han, Xiaocheng Liu, Zixiang Huang, Pinyi Wang, Sizhe Sheng, Geng Wu, Jiachuan He, Jingjing Guo, Xusheng Zheng, Hai Li, Jian-Wei Liu, Xun Hong

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Abstract

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.

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用于电致变色智能窗的非晶-晶体界面诱导内电场

要在电致变色材料中实现高着色效率，平衡光学调制和响应时间至关重要。在这里，通过构建丰富的非晶-晶体界面，将内电场引入二氧化钛纳米片，在确保大光学调制的同时缩短了响应时间，从而提高了着色效率。像差校正高角度环形暗场扫描透射电子显微镜（HAADF-STEM）显示，二氧化钛纳米片中存在大量非晶-晶体相界。开尔文探针力显微镜（KPFM）显示出强烈的表面电位分布，证明了内部电场的存在。密度泛函理论（DFT）计算证实，非晶-晶体异质界面可以产生内电场，降低锂离子的扩散障碍。因此，非晶-晶体二氧化钛纳米片的着色效率（35.1 cm2 C-1）优于纯非晶和晶体二氧化钛纳米片。

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来源期刊

Analytical Chemistry 化学-分析化学

CiteScore

12.10

自引率

12.20%

发文量

1949

审稿时长

1.4 months

期刊介绍： Analytical Chemistry, a peer-reviewed research journal, focuses on disseminating new and original knowledge across all branches of analytical chemistry. Fundamental articles may explore general principles of chemical measurement science and need not directly address existing or potential analytical methodology. They can be entirely theoretical or report experimental results. Contributions may cover various phases of analytical operations, including sampling, bioanalysis, electrochemistry, mass spectrometry, microscale and nanoscale systems, environmental analysis, separations, spectroscopy, chemical reactions and selectivity, instrumentation, imaging, surface analysis, and data processing. Papers discussing known analytical methods should present a significant, original application of the method, a notable improvement, or results on an important analyte.