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Synthesis of hierarchical WO3 nanostructured thin films with enhanced electrochromic performance for switchable smart windows

机译：具有增强的可切换智能窗口电致变色性能的分层WO3纳米结构薄膜的合成

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摘要

In our present work, hierarchical WO3 nanostructured thin films were successfully synthesized over pre-deposited seed layered FTO substrates through an electrodeposition method. By adjusting the pH values of the electrolyte, three different morphologies such as nanospindles (W1), nanoplatelets (W2), and hierarchical flower (W3) like nanoarray films have been obtained. The structural, surface, compositional and optical performance of the WO3 nanostructured thin films were characterized by XRD, FESEM, AFM, XPS, UV-VIS and detailed electrochromic functionality was examined by cyclic voltammetry (CV) at different applied potentials. Among the three nanostructured thin film electrodes (W1, W2, W3), W3 exhibits excellent larger optical contrast (79.90% at 550 nm), faster switching response time (t(b) = 3.82 s and t(c) = 5.05 s), and superior coloration efficiency (172.08 cm(2) C-1) with stability over 2000 cycles. The synthesized WO3 electrode (W3) with flower morphology shows excellent reversibility of around 94.11% compared to the other nanostructures (W1 and W2) due to its enhanced crystallinity and high porosity. Our results suggest that flower-like WO3 nanostructured thin film electrodes will have a great impact on large scale production and make the material a promising candidate for fabrication of efficient electrochromic devices.
机译：在我们目前的工作中，分层WO3纳米结构化薄膜，成功地合成了在预先沉积的种子通过电沉积法层叠FTO基材。通过调节电解质的pH值，已获得的三个不同的形态，例如nanospindles（W1），纳米片（W2），和分层花（W3）等纳米阵列膜。结构，表面，所述纳米结构化WO3薄膜的组成和光学性能通过XRD，FESEM，AFM，XPS，UV-VIS表征和通过在不同的施加电势的循环伏安法（CV）研究详述电致变色功能。在这三种纳米结构薄膜电极（W1，W2，W3），W3表现出优异的大的光学对比度（在550nm 79.90％），更快的开关响应时间（t（B）= 3.82 s和t（C）= 5.05 S）和优异的着色效率（172.08厘米（2）C-1）有超过2000个循环的稳定性。将合成的WO3电极（W3）与花形态显示出优异的周围94.11％可逆性相比于其他纳米结构（W1和W2）由于其强化结晶性和高孔隙率。我们的研究结果表明，花状WO3纳米结构薄膜电极将有大规模的生产产生重大影响，使材料有希望的候选高效的电致变色器件的制造。

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  • 来源
    《RSC Advances》 |2015年第117期|共12页
  • 作者

    Poongodi S.; Kumar P. Suresh; Masuda Yoshitake; Mangalaraj D.; Ponpandian N.; Viswanathan C.; Ramakrishna Seeram;

  • 作者单位

    Bharathiar Univ Dept Nanosci &

    Technol Coimbatore 641046 Tamil Nadu India;

    Ngee Ann Polytech Ctr Innovat Environm &

    Water Technol Singapore 599489 Singapore;

    Natl Inst Adv Ind Sci &

    Technol Moriyama Ku Nagoya Aichi 4638560 Japan;

    Bharathiar Univ Dept Nanosci &

    Technol Coimbatore 641046 Tamil Nadu India;

    Bharathiar Univ Dept Nanosci &

    Technol Coimbatore 641046 Tamil Nadu India;

    Bharathiar Univ Dept Nanosci &

    Technol Coimbatore 641046 Tamil Nadu India;

    Natl Univ Singapore Dept Mech Engn Ctr Nanofibers &

    Nanotechnol Singapore 117576 Singapore;

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