Electrodeposited CuxFe3-xSe4 nanoheterostructure arrays on carbon cloth as a binder-free faradaic negative electrode for asymmetric supercapacitors. (1st June 2023)

• Record Type: Journal Article
• Authors: Das, Amit Kumar; Shankar, Edugulla Girija; Ramulu, Bhimanaboina; Yu, Jae Su
• Is Part Of: Composites. Number 258(2023)
• Publication Date: 2023-06-01
• Subjects: CuxFe3-xSe4 nanoheterostructure arrays -- Chronoamperometric electrodeposition -- Ni3Se2/NiSe2 nanosheet arrays -- Kinetic matching strategy -- Asymmetric supercapacitor; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2023.110705
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Extensive research is being conducted worldwide to design and develop novel high-performance electrodes for supercapacitors (SCs) being a viable alternative to fossil fuels, dealing with the challenges of looming energy crisis and environmental issues globally. Herein, the design and synthesis of novel binder-free Cux Fe3-x Se4 @carbon cloth (CFS@CC) nanoheterostructure array electrode materials with tunable copper (Cu)/iron (Fe) stoichiometric ratios are demonstrated via a one-step room-temperature chronoamperometric (potentiostatic) electrodeposition process and their electrochemical characteristics as a promising faradaic negative electrode for SCs are explored systematically. The effect of Cu/Fe stoichiometric ratios on the morphological property and electrochemical performance of different CFS@CC array electrodes is thoroughly investigated to realize the sufficiently reaping synergistic benefits of Cu and Fe ions. Moreover, following a kinetic matching strategy, the optimized CFS@CC arrays as a negative electrode are assembled with the faradaic Ni3 Se2 /NiSe2 @CC nanosheet arrays as a positive electrode to fabricate a novel asymmetric supercapacitor (ASC) device (Ni3 Se2 /NiSe2 @CC//CFS-1.5@CC) which is operable in a large and stable potential window of 1.6 V and exhibits a high energy density of 84.8 Wh kg −1 at a power density of 664 W kg −1 with an excellent long-term electrochemical cycling stability. Some real-life applications of the as-fabricated ASC device are displayed to ensure its practicality. Graphical abstract: Image 1 Highlights: Faradaic Cux Fe3-x Se4 nanoheterostructure arrays are explored as a negative electrode. The optimized Cux Fe3-x Se4 electrode exhibits a specific capacity of 317 mAh g −1 . An ASC device is fabricated with Ni3 Se2 /NiSe2 @CC nanosheet arrays as a positive electrode. The ASC device shows a high energy density of 84.8 Wh kg −1 at 664 W kg −1 of power density. The practicality of the ASC device is demonstrated by powering electronic components.