Journal
NANOSCALE
Volume 5, Issue 11, Pages 4808-4815Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr00887h
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Funding
- Shanghai Municipal Education Commission [07SG37]
- Science and Technology Commission of Shanghai Municipality [12nm0503900]
- Natural Science Foundation of China [51072034, 51172042]
- Cultivation Fund of the Key Scientific and Technical Innovation Project [708039]
- Specialized Research Fund for the Doctoral Program of Higher Education [20110075130001]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Program of Introducing Talents of Discipline to Universities [111-2-04]
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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 cm(2) 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.
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