Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 593, Issue -, Pages 184-189Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.01.036
Keywords
Nickel oxide; Mesoporous; Nanoflake; Supercapacitor; Porous film
Categories
Funding
- Foundation of State Key Laboratory of Coal Conversion [J14-15-909]
- Doctor Funds [20122035]
- UIT of Taiyuan University of Science and Technology [xj2013061]
- Shanxi Province Science Foundation for Youths [2013021011-6]
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Highly porous metal oxide nanoflake arrays are important for developing high-performance electrochemical devices. Herein, mesoporous NiO nanoflake arrays have been successfully prepared by a facile hydrothermal synthesis method. Except for the mesoporous walls, the NiO nanoflakes are interconnected with each other to form macroporous structure. This porous structured NiO nanoflake arrays possess a high specific surface area of similar to 185 m(2) g(-1). The supercapacitor performance of the mesoporous NiO nanoflake arrays is fully characterized. The mesoporous NiO nanoflake arrays exhibit weaker polarization, higher specific capacitance and better rate capability than the common NiO nanoflake arrays. The mesoporous NiO nanoflake arrays deliver a specific capacitance of 400 F g(-1) at 2 A g(-1) and 339 F g(-1) at 40 A g(-1), respectively, higher than those of the common NiO nanoflake arrays (287 F g(-1) at 2 A g(-1) and 179 F g(-1) at 40 A g(-1)). The enhanced performance is mainly due to the hierarchical pore system in the mesoporous NiO nanoflake arrays. (C) 2014 Elsevier B.V. All rights reserved.
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