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

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.

A Review of Supercapacitors: Materials Design, Modification, and Applications

“…Similarly, CoS/NF, CuS/NF, FeS/NF, and NiS/NF [135], CoMoO 4 [136]. NiMnO 3 [137], Co@NiSe 2 [138], C@Ni 0.9 Cu 0.1-S [139], α-MnO 2 , β-MnO 2 and Mn 3 O 4 [140], CuCo 2 S 4 [141], Ni 3 S 2 /MoS 2 [142], Cu-MnS with PVP [143] etc., were also successfully synthesized for a supercapacitor as electrode materials by measn of the hydrothermal method. The developed hydrothermal process showed promising effects for the synthesis of Cu-MnS with PVP nanocomposite for a high-performance supercapacitor.…”

The electrochemical kinetics of cerium selenide nano-pebbles: the design of a device-grade symmetric configured wide-potential flexible solid-state supercapacitor

“…The power and energy densities for the fabricated SC have been calculated by considering the active mass loadings of both electrodes. According to the best of our knowledge, the cerium selenide‖cerium selenide SSC provides high power density compared to recently reported selenide-based symmetric and asymmetric SCs, such as CoSe 2 ‖N-doped carbon nanowall ASC (1914.7 W kg −1 , 2017), 71 α-MnSe‖α-MnSe SSC (25 W kg −1 , 2018), 72 CoSe‖AC ASC (750 W kg −1 , 2018), 15 Co@NiSe 2 ‖AC ASC (790 W kg −1 , 2018), 73 FeCo-selenide‖Fe 2 O 3 ASC (759.6 W kg −1 , 2018), 74 Ni 0.5 Co 0.5 Se 2 ‖rGO based ASC (745 W kg −1 , 2018), 75 MoSe 2 –Ni(OH) 2 ‖AC based ASC (817 W kg −1 , 2018), 76 and E-CoSe 2 /Ni 0.85 Se‖AC ASC (538 W kg −1 , 2018). 77 …”

Layer-Structured Anisotropic Metal Chalcogenides: Recent Advances in Synthesis, Modulation, and Applications

“…Doping of foreign atoms can tune the morphology, interlayer spacing, faradaic reaction, and electronic conductivity. Co doping (1.8 at%) in 1D NiSe 2 NWs improved the specific capacitance by increasing the surface area . The Co-doped NiSe 2 NWs were directly grown on nickel foam by using the hydrothermal process.…”

“…Co doping (1.8 at%) in 1D NiSe 2 NWs improved the specific capacitance by increasing the surface area. 1131 The Co-doped NiSe 2 NWs were directly grown on nickel foam by using the hydrothermal process. After Codoping, the NW diameter was reduced from 50 to 20 nm, the active surface area increased from 54.6 m 2 g −1 to 135.2 m 2 g −1 , and thus the specific capacitances were enhanced from 1091.3 F g −1 to 3167.6 F g −1 .…”