Abstract
We present a facile one-step hydrothermal method to in situ grow nickel selenide (Ni3Se2) nanosheets on nickel (Ni) foam (Ni3Se2/Ni) by using SeO2 as selenide source, Ni foam as nickel source and NaBH4 as reducing agent. The mole ratio of NaBH4/SeO2 is optimized as 4:1. An asymmetric supercapacitor (ASC) is fabricated by using as synthesized Ni3Se2/Ni as positive electrode and activated carbon (AC) as negative electrode. The synthesized materials and assembled devices are measured and characterized by a field emission scanning electron microscopy, powder X-ray diffraction, cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The results shows that the as-synthesized Ni3Se2/Ni electrode possesses a high specific capacitance of 854 F g−1 at 1 A g−1. The ASC can steadily operate with a high voltage of 1.6 V in 3 M KOH electrolytes, and possesses a superior energy density of 23.3 W h kg−1 at a power density of 398.1 W kg−1. In addition, the Ni3Se2//AC ASC shows excellent charge/discharge stability, after 5000 cycles the capacitance retention reaches 91.11%. The excellent performance of Ni3Se2/Ni electrode is mainly due to the pseudo-capacitive by Ni3Se2 and the 3D structure of Ni foam.
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The authors acknowledge the financial joint support by the National Natural Science Foundation of China (Nos. 51472094, 91422301, 61474047).
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Jiang, S., Wu, J., Ye, B. et al. Growth of Ni3Se2 nanosheets on Ni foam for asymmetric supercapacitors. J Mater Sci: Mater Electron 29, 4649–4657 (2018). https://doi.org/10.1007/s10854-017-8416-y
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DOI: https://doi.org/10.1007/s10854-017-8416-y