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Issue 40, 2012
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Morphology evolution of urchin-like NiCo2O4 nanostructures and their applications as psuedocapacitors and photoelectrochemical cells

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Abstract

Urchin-like NiCo2O4 nanostructures were synthesized on a large scale via a simple hydrothermal method free of any template and catalyst. As-synthesized NiCo2O4 urchins have uniform diameters of 5 μm with numerous small nanorods radially grown from the center. Typical nanorods have diameters of 100–200 nm and lengths of about 2 μm. Studies found that urea plays an important role to determine the morphology of the products and a “rods-to-straw-bundles-to-urchins” mechanism was proposed. With a porous structure and a large surface area of 99.3 m2 g−1, the prepared NiCo2O4 urchins exhibited superior specific capacitance of 1650 and 1348 F g−1 at current densities of 1 and 15 A g−1, respectively. The capacitance loss after 2000 cycles is only 9.2% at the current density of 8 A g−1, indicating their excellent cycling stability. Photoelectrochemical cells were also fabricated on the urchin-like NiCo2O4 nanostructures with the features of fast photocurrent response and excellent stability. A high photocurrent response of about 70 μA cm−2 was observed.

Graphical abstract: Morphology evolution of urchin-like NiCo2O4 nanostructures and their applications as psuedocapacitors and photoelectrochemical cells

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Publication details

The article was received on 17 Jul 2012, accepted on 21 Aug 2012 and first published on 24 Aug 2012


Article type: Paper
DOI: 10.1039/C2JM34705A
Citation: J. Mater. Chem., 2012,22, 21647-21653
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    Morphology evolution of urchin-like NiCo2O4 nanostructures and their applications as psuedocapacitors and photoelectrochemical cells

    Q. Wang, B. Liu, X. Wang, S. Ran, L. Wang, D. Chen and G. Shen, J. Mater. Chem., 2012, 22, 21647
    DOI: 10.1039/C2JM34705A

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