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Issue 15, 2017
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Direct aqueous solution synthesis of an ultra-fine amorphous nickel–boron alloy with superior pseudocapacitive performance for advanced asymmetric supercapacitors

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Abstract

This study reports a facile aqueous solution synthesis of an ultrafine amorphous nickel–boron alloy and its applications as a novel positive electrode material for asymmetric supercapacitors. The electrochemical properties of the as-prepared amorphous Ni–B alloy were studied, and the results demonstrate that the material synthesized at room temperature shows a high specific capacitance of 2230 F g−1 at 1 A g−1 in a three-electrode system, and the capacitance remained at 986 F g−1 when the current density is increased up to 20 A g−1. An amorphous Ni–B//AC (activated carbon) asymmetric supercapacitor is successfully assembled with the amorphous Ni–B alloy as the cathode and AC as the anode. Such an assembled device shows a high specific capacitance of 135.5 F g−1 at 1 A g−1. It can deliver a maximum energy density of 59.3 W h kg−1 at a power density of 1004 W kg−1, better than most of the supercapacitors reported in the literature. Furthermore, this asymmetric supercapacitor also exhibits an excellent, long cycle life along with 88.2% specific capacitance retention after 5000 consecutive cycles. Our results show that the amorphous nickel–boron alloy, as a new type of high-performance electrode material, is promising for advanced supercapacitor applications.

Graphical abstract: Direct aqueous solution synthesis of an ultra-fine amorphous nickel–boron alloy with superior pseudocapacitive performance for advanced asymmetric supercapacitors

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Publication details

The article was received on 20 Jan 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00222J
Citation: New J. Chem., 2017,41, 7302-7311
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    Direct aqueous solution synthesis of an ultra-fine amorphous nickel–boron alloy with superior pseudocapacitive performance for advanced asymmetric supercapacitors

    W. Li, S. Wang, M. Wu, X. Wang, Y. Long and X. Lou, New J. Chem., 2017, 41, 7302
    DOI: 10.1039/C7NJ00222J

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