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Materials 2018, 11(8), 1468;

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
Author to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 11 July 2018 / Accepted: 15 August 2018 / Published: 18 August 2018
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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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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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