Journal
NEW JOURNAL OF CHEMISTRY
Volume 41, Issue 15, Pages 7302-7311Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj00222j
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Funding
- National Science Foundation of China (NSFC) [51372195]
- CSS [YK2015-0602006]
- Fundamental Research Funds for the Central Universities [2013JDGZ03]
- Ministry of Education of China [IRT13034]
- One Thousand Youth Talents program
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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 Fg(-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.
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