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Direct Aqueous Solution Synthesis of Ultra-fine Amorphous Nickel-Boron Alloy with Superior Pseudocapacitive Performance for Advanced Asymmetric Supercapacitors

Abstract

This study reports a facile aqueous solution synthesis of ultrafine amorphous Ni-B 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 has shown a high specific capacitance of 2230 F g-1 at 1 A g-1 in a three-electrode system, and the capacitance still remained 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 was successfully assembled by use of amorphous Ni-B alloy and AC as the cathode and anode, respectively. Such an assembled device shows a high specific capacitance of 135.5 F g-1 at 1 A g-1. It can deliver the maximum energy density of 59.3 Wh 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 times of cycling. Our results show that the amorphous nickel boride alloy, as a new type and high-performance electrode material, is promise for advanced supercapacitor applications.

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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, Accepted Manuscript
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    Direct Aqueous Solution Synthesis of 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, Accepted Manuscript , DOI: 10.1039/C7NJ00222J

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