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Issue 11, 2013
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Hierarchical NiO microflake films with high coloration efficiency, cyclic stability and low power consumption for applications in a complementary electrochromic device

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Abstract

We have demonstrated that thin films of hierarchical NiO microflakes assembled from nanoleaves can be grown directly on FTO-coated glass substrates using a facile and template-free hydrothermal technique. This hierarchical structure holds the advantages of both nanometre-sized building blocks and microsized assemblies. Thus, the films exhibit highly enhanced electrochromic performances and cyclic stability due to their high surface area and good electrochemical stability. Moreover, a complementary electrochromic device combining the hierarchical NiO microflake film with a self-weaving WO3 nanoflake film is fabricated to further improve the electrochromic performance. As a result, the complementary electrochromic device shows a high optical modulation (73.2% at 550 nm), large coloration efficiency (146.9 cm2 C−1 at 550 nm by applying a low coloration voltage of −1.0 V) and fast switching responses with a coloring time of 1.8 s and a bleaching time of 3.2 s. It is also observed that there is no significant degradation of the electrochromic properties after 2000 continuous coloration/bleaching cycles, making it attractive for practical applications.

Graphical abstract: Hierarchical NiO microflake films with high coloration efficiency, cyclic stability and low power consumption for applications in a complementary electrochromic device

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Publication details

The article was received on 20 Feb 2013, accepted on 25 Mar 2013 and first published on 28 Mar 2013


Article type: Paper
DOI: 10.1039/C3NR00887H
Citation: Nanoscale, 2013,5, 4808-4815
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    Hierarchical NiO microflake films with high coloration efficiency, cyclic stability and low power consumption for applications in a complementary electrochromic device

    D. Ma, G. Shi, H. Wang, Q. Zhang and Y. Li, Nanoscale, 2013, 5, 4808
    DOI: 10.1039/C3NR00887H

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