Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 14, Issue 3, Pages 431-437Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201801685
Keywords
electrochemistry; nanostructures; surface analysis; synthesis design; thin films
Categories
Funding
- Natural Science Foundation of Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [YX03001]
- Natural Science Foundation of Jiangsu Higher Education Institutions [18KJA430010]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [KYCX17_0759]
- Scientific Fund of Nanjing University of Posts and Telecommunications [NY215182]
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An electrochromic device with the as-obtained nanoporous NiO /ZnO nanoarray as a working electrode was constructed and assembled. The nanoporous NiO/ZnO nanoarray film with a three-dimensional structure was prepared on indium tin oxide (ITO) glass substrate through a two-step route that combined chemical bath deposition method with a hydrothermal method. The nanoporous NiO/ZnO nanoarray electrode reveals a noticeable improvement in electrochromism compared with that of nanoporous NiO alone, including higher optical modulation (81 %), higher coloration efficiency (78.5 cm(2) C-1), faster response times (2.6 and 9.7 s for coloring and bleaching, respectively), and favorable durability performance. Such enhancements are mainly attributed to the three-dimensional structures of nanoporous NiO coated on ZnO nanoarray, namely, 1) the uniform hexagonal ZnO nanoarray loads more nanoporous NiO, 2) nanoporous NiO cross-linked with ZnO nanorods provides a loose interspace morphology, 3) stronger adhesion between ZnO nanorods and ITO covered with ZnO seed, 4) core-shell and cross-linked structures promote electrolyte infiltration, and 5) appropriate band gaps improve charge transfer.
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