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首页> 外文期刊>Nanotechnology >Pseudocapacitive behaviour in sol-gel derived electrochromic titania nanostructures
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Pseudocapacitive behaviour in sol-gel derived electrochromic titania nanostructures

机译：溶胶 - 凝胶衍生电致变色二氧化钛纳米结构的假偶联行为

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摘要

Nanostructured thin films are widely investigated for application in multifunctional devices thanks to their peculiar optoelectronic properties. In this work anatase TiO2 nanoparticles (average diameter 10 nm) synthesised by a green aqueous sol-gel route are exploited to fabricate optically active electrodes for pseudocapacitive-electrochromic devices. In our approach, highly transparent and homogeneous thin films having a good electronic coupling between nanoparticles are prepared. These electrodes present a spongy-like nanostructure in which the dimension of native nanoparticles is preserved, resulting in a huge surface area. Cyclic voltammetry studies reveal that there are significant contributions to the total stored charge from both intercalation capacitance and pseudocapacitance, with a remarkable 50% of the total charge deriving from this second effect. Fast and reversible colouration occurs, with an optical modulation of similar to 60% in the range of 315-1660 nm, and a colouration efficiency of 25.1 cm(2) C-1 at 550 nm. This combination of pseudocapacitance and electrochromism makes the sol-gel derived titania thin films promising candidates for multifunctional 'smart windows'.
机译：纳米结构薄膜由于其独特的光电特性，在多功能器件中得到了广泛的应用。在这项工作中，利用绿色水溶胶-凝胶法合成的锐钛矿型TiO2纳米颗粒（平均直径10 nm）制备假电容电致变色器件的光学活性电极。在我们的方法中，制备了纳米颗粒之间具有良好电子耦合的高度透明和均匀的薄膜。这些电极呈现海绵状纳米结构，其中保留了天然纳米颗粒的尺寸，形成了巨大的表面积。循环伏安法研究表明，插层电容和赝电容对总存储电荷都有显著贡献，其中50%的总电荷来自第二个效应。快速可逆着色，在315-1660 nm范围内的光学调制率接近60%，在550 nm范围内的着色效率为25.1 cm（2）C-1。这种假电容和电致变色的结合使得溶胶-凝胶法制备的二氧化钛薄膜有望成为多功能“智能窗口”的候选材料。

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  • 来源
    《Nanotechnology》 |2021年第4期|共12页
  • 作者

    Giannuzzi Roberto; Prontera Tania; Tobaldi David M.; Pugliese Marco; De Marco Luisa; Carallo Sonia; Gigli Giuseppe; Pullar Robert C.; Maiorano Vincenzo;

  • 作者单位

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Aveiro Dept Mat &

    Ceram Engn 3810-193 Campus Univ Santiago Aveiro Portugal;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

    Univ Aveiro Dept Mat &

    Ceram Engn 3810-193 Campus Univ Santiago Aveiro Portugal;

    Univ Salento CNR NANOTEC Inst Nanotechnol Campus Ecotekne Via Monteroni I-73100 Lecce Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    TiO2; electrochromics; pseudocapacitance; sol-gel;

    机译：二氧化钛;电致变色;假电容;溶胶-凝胶;

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