Journal
NANOSCALE
Volume 7, Issue 40, Pages 17088-17095Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr04458h
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Funding
- 863 Program [2013AA032501]
- National Natural Science Foundation of China (NSFC)
- Ministry of Education of China [20120010120010]
- Beijing Natural Science Foundation [2132043]
- China National Funds for Distinguished Young Scientists of the NSFC
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Electrochromic materials are the most important and essential components in an electrochromic device. Herein, we fabricated high-performance electrochromic films based on exfoliated layered double hydroxide (LDH) nanosheets and Prussian blue (PB) nanoparticles via the layer-by-layer assembly technique. X-ray diffraction and UV-vis absorption spectroscopy indicate a periodic layered structure with uniform and regular growth of (LDH/PB)(n) ultrathin films (UTFs). The resulting (LDH/PB)(n) UTF electrodes exhibit electrochromic behavior arising from the reversible K+ ion migration into/out of the PB lattice, which induces a change in the optical properties of the UTFs. Furthermore, an electrochromic device ([CD) based on the (LDH/PB)(n)-ITO/0.1 M KCl electrolyte/ITO sandwich structure displays superior response properties (0.91/1.21 s for coloration/bleaching), a comparable coloration efficiency (68 cm(2) C-1) and satisfactory optical contrast (45% at 700 nm), in comparison with other inorganic material-based ECDs reported previously. Therefore, this work presents a facile and cost-effective strategy to immobilize electrochemically active nanoparticles in a 2D inorganic matrix for potential application in displays, smart windows and optoelectronic devices.
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