Hierarchically hollow NiCo 2 S 4 /graphitic nanofiber film with ultrahigh-rate capability and long-term cycling durabili
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ORIGINAL PAPER
Hierarchically hollow NiCo2S4/graphitic nanofiber film with ultrahigh-rate capability and long-term cycling durability for asymmetrical supercapacitor Yi He 1 & Lijuan Liu 1 & Shihan Tao 1 & Jing Ye 1 & Jun Wu 1 & Cuiying Xu 1 & Qiaohui Guo 1 Received: 18 February 2020 / Revised: 3 August 2020 / Accepted: 30 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract NiCo2S4 nanostructures have been intensively investigated as supercapacitor electrode materials ascribing to its high conductivity and capacity. However, NiCo2S4-based electrodes suffer inferior cycling durability owing to its structural degradation during the redox process. Herein, NiCo2S4 nanoneedles anchored on the graphitic carbon nanofiber mat (NiCo2S4/GCN) are synthesized via a two-pot hydrothermal method. The NiCo2S4/GCN composed of highly conductive graphitic carbon nanofiber (GCN) frameworks ensures the uniform dispersion of NiCo2S4 and accelerate electron/ion transport, and NiCo2S4 with porous and hollow nanostructure facilitates the diffusion of electrolyte. The NiCo2S4/GCN electrode reveals a high-energy storage capability (1775.2 F g−1 at 10 A g−1) and an amazing rate retention (1510.2 F g−1 at 50 A g−1). Furthermore, the NiCo2S4/ GCN//active carbon device displays a superior energy density (52.3 W h kg−1 at 358.0 W kg−1) and preeminent cycle life (retention 94.7% after 10,000 cycles at 5 A g−1), suggesting a promising candidate in supercapacitor applications. Keywords NiCo2S4 . Free-standing . Hollow nanoneedle . Asymmetrical supercapacitor
Introduction The exploiting of clean energy storage systems has become a hotspot because of the serious environmental pollution caused by fossil fuel burning [1]. Recently, supercapacitors (SCs) have been attracted much attention due to its fast charging capability with satisfactory cycling performance [2–4]. However, the defect of low energy density hinders its widespread application [5, 6]. Generally, the properties of electrode are significant for SCs, such as chemical activity, surface area, conductivity. and configuration [7, 8]. Therefore, seeking for novel electrode materials with good characteristic is a dominate challenge [6, 9].
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03765-5) contains supplementary material, which is available to authorized users. * Qiaohui Guo [email protected] 1
Department of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, Jiangxi, China
Currently, transition metal sulfides have been widely applied for electrode materials of SCs, such as CoSx, NiSx, and NiCo2S4 [10–12]. Among, NiCo2S4 aroused much attention owing to it possessed higher capacitance when compared with NiSx and CoSx, and its electronic conductivity was approximated 100 times higher than that of NiCo2O4 [12, 13]. Furthermore, NiCo2S4 possessed merits of cost-effective, low toxicity, and abundant reserves [14, 15]. Therefore, NiCo2S4 with various morphologies including
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