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Issue 28, 2014
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CoNiO2/TiN–TiOxNy composites for ultrahigh electrochemical energy storage and simultaneous glucose sensing

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Abstract

We report a rational growth of functional CoNiO2/TiN–TiOxNy composites on flexible Ni foam for ultrahigh energy storage with fast charging capability and simultaneous non-enzymatic glucose detection. The TiN–TiOxNy intermediate layer provides both fast electron transport and a uniform growth substrate for polycrystalline mesoporous CoNiO2 NWs, at the same time preventing corrosion of the Ni substrate. Ultrahigh areal pseudocapacitance of 3181 and 2763 F g−1 (or 3.36 and 2.83 F cm−2) is obtained from the CoNiO2/TiN–TiOxNy composite at current densities of 2 and 10 mA cm−2, respectively; these values are substantially better than those obtained from the plain CoNiO2 NWs at the same current densities. Furthermore, the CoNiO2/TiN–TiOxNy composite exhibits high flexibility and cycling stability, and can be charged up to 1.64 F cm−2 within 9 seconds at a high current density of 100 mA cm−2. Moreover, after being fully charged, the CoNiO2/TiN–TiOxNy composite-based pseudocapacitors can maintain an extended discharge time of hundreds to thousands of seconds, and are demonstrated as power-free sensors for real-time electrochemical detection of glucose, with a detection limit of ∼1 μM.

Graphical abstract: CoNiO2/TiN–TiOxNy composites for ultrahigh electrochemical energy storage and simultaneous glucose sensing

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Publication details

The article was received on 19 Feb 2014, accepted on 14 Apr 2014 and first published on 16 Apr 2014


Article type: Paper
DOI: 10.1039/C4TA00875H
J. Mater. Chem. A, 2014,2, 10904-10909

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    CoNiO2/TiN–TiOxNy composites for ultrahigh electrochemical energy storage and simultaneous glucose sensing

    Z. Peng, D. Jia, J. Tang, Y. Wang, Y. Wang, L. Zhang and G. Zheng, J. Mater. Chem. A, 2014, 2, 10904
    DOI: 10.1039/C4TA00875H

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