Nickel foam supported hierarchical NiCo2S4@NiFe LDH heterostructures as highly efficient electrode for long cycling stability supercapacitor. (1st April 2023)

• Record Type: Journal Article
• Authors: Rabbani, Syeda Sughra; Mustafa, Hamna; Zafar, Amina; Javaid, Saqib; Bakar, Muhammad Abu; Nisar, Amjad; Liu, Yanguo; Karim, Shafqat; Sun, Hongyu; Hussain, Shafqat; Zafar, Zainab; Faiz, Yasir; Faiz, Faisal; Yu, Yanlong; Ahmad, Mashkoor
• Is Part Of: Electrochimica acta. Volume 446(2023)
• Publication Date: 2023-04-01
• Subjects: Layered double hydroxides -- Hierarchical NiCo2S4@NiFe nanosheets -- Supercapacitor electrode -- Electrochemical performance -- DFT calculations; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2023.142098
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Layered double hydroxides (LDHs) based heterostructures provide an opportunity for the development of high-performance supercapacitors. Up till now, hierarchical NiCo2 S4 @NiFe LDH heterostructure is scarcely investigated for supercapacitor. In this work, the hierarchical NiCo2 S4 @NiFe LDH heterostructure nanosheet arrays on Ni-foam (NF) were synthesized by a facile hydrothermal method. As the supercapacitor electrode, it has been revealed that the incorporation of NiFe can significantly increase the capacitive performance of the heterostructure. At a current density of 1 Ag −1, a specific capacitance of NiCo2 S4 @NiFe LDH electrode was reached up to 827 Fg −1, outperforming that of pristine NiCo2 S4 and NiFe LDH. Moreover, the electrode keeps 90.2% of its preliminary capacitance after 12, 000 cycles at 5 A g −1 . In addition, NiCo2 S4 @NiFe LDH electrode offer high energy density of 38.1 W h kg −1 and power density of 1800 W kg −1 . According to DFT calculations, NiFe-LDH adsorption on NiCo2 S4 is strong and governed by large interfacial interactions with a charge transfer of 0.44 eV to NiCo2 S4 surface thus demonstrating the significantly improved electrochemical performance. Hence, such an outstanding electrochemical finding suggest that NiCo2 S4 @NiFe LDH heterostructures could be attractive electrode materials as practical supercapacitors for next generation energy storage devices. Graphical abstract: Image, graphical abstract