Journal
NANO ENERGY
Volume 5, Issue -, Pages 52-59Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.01.006
Keywords
Hollow hexagons; Facet-selective growth; Core-shell structure; Capacitance property; Longterm stability
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Funding
- National Natural Science Foundation of China [NSFC 5137101, 11174023, 51331002]
- Beijing Municipal Research Project for Outstanding Doctoral Thesis Supervisors [20121000603]
- Beijing Municipal Natural Science Foundation [2142018]
- Science Foundation Ireland [07/SK/I1220a]
- Irish Government's Program for Research in Third Level Institutions, Cycle 4, National Development Plan
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Hollow nanohexagons with a core-shell structure have been synthesized from a mixture of Ni and Co hydroxide by a mild wet chemical approach. Ni(OH)(2)@Co(OH)(2) nanohexagons with controllable sizes of about 200 nm, morphology and structure are obtained. Comprehensive microstructure analysis reveals that the Ni(OH)(2) and Co(OH)(2) components are single-crystalline. The surfaces of the nanohexagons are smooth and their inner facets can be controlled to be parallel to the outer facets or rotated by 30 degrees. A growth mechanism depending on the N2H4 center dot H2O content and reaction temperature has been proposed to explain the different structures. The parallel inner facets tend to form with higher amounts of N2H4 center dot H2O while the rotated ones tend to form at higher temperature. The specific capacitance of the hollow nanohexagon is about 369 F/g, which can be remained as high as 96.4% after 2500 cycles at current density of 1 A/g. (C) 2014 Elsevier Ltd. All rights reserved.
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