Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 184, Issue 3, Pages 578-583Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.01.019
Keywords
Nullaginite; Robust mechanical adhesion; NiO; Porous nanowall arrays; Supercapacitor
Funding
- National Natural Science Foundation of China [50872039, 50802032]
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Porous NiO nanowall arrays (NWAs) grown on flexible Fe-Co-Ni alloy have been successfully synthesized by using nullaginite (Ni-2(OH)(2)CO3) as precursor and investigated as supercapacitor electrodes. In details, we adopted a simple hydrothermal method to realize Ni-2(OH)(2)CO3 NWAs and examined their robust mechanical adhesion to substrate via a long-time ultrasonication test. Porous NiO NWAs were then obtained by a post-calcination towards precursors at 500 degrees C in nitrogen atmosphere. Electrochemical properties of as-synthesized NiO NWAs were evaluated by cyclic voltammetry and galvanostatic charge/discharge; porous NiO NWAs electrode delivered a specific capacitance of 270 F/g (0.67 A/g); even at high current densities, the electrode could still deliver a high capacitance up to 236 F/g (13.35 A/g). Meanwhile, it exhibited excellent cycle lifetime with similar to 93% specific capacitance kept after 4000 cycles. These results suggest that as-made porous NiO NWAs electrode is a promising candidate for future thin-film supercapacitors and other microelectronic systems. (C) 2011 Elsevier Inc. All rights reserved.
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