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Materials 2018, 11(8), 1468; https://doi.org/10.3390/ma11081468

Hydrothermal Synthesis of Co-Doped NiSe2 Nanowire for High-Performance Asymmetric Supercapacitors

Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China
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Received: 20 June 2018 / Revised: 11 July 2018 / Accepted: 15 August 2018 / Published: 18 August 2018
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Abstract

Co@NiSe2 electrode materials were synthesized via a simple hydrothermal method by using nickel foam in situ as the backbone and subsequently characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and a specific surface area analyzer. Results show that the Co@NiSe2 electrode exhibits a nanowire structure and grows uniformly on the nickel foam base. These features make the electrode show a relatively high specific surface area and electrical conductivity, and thus exhibit excellent electrochemical performance. The obtained electrode has a high specific capacitance of 3167.6 F·g−1 at a current density of 1 A·g−1. To enlarge the potential window and increase the energy density, an asymmetric supercapacitor was assembled by using a Co@NiSe2 electrode and activated carbon acting as positive and negative electrodes, respectively. The prepared asymmetrical supercapacitor functions stably under the potential window of 0–1.6 V. The asymmetric supercapacitor can deliver a high energy density of 50.0 Wh·kg−1 at a power density of 779.0 W·kg−1. Moreover, the prepared asymmetric supercapacitor exhibits a good rate performance and cycle stability. View Full-Text
Keywords: Co-doped NiSe2; nanowire; hydrothermal method; pseudocapacitance; asymmetric supercapacitors Co-doped NiSe2; nanowire; hydrothermal method; pseudocapacitance; asymmetric supercapacitors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gu, Y.; Fan, L.-Q.; Huang, J.-L.; Geng, C.-L.; Lin, J.-M.; Huang, M.-L.; Huang, Y.-F.; Wu, J.-H. Hydrothermal Synthesis of Co-Doped NiSe2 Nanowire for High-Performance Asymmetric Supercapacitors. Materials 2018, 11, 1468.

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