Design and fabrication of NiFe2O4/few-layers WS2 composite for supercapacitor electrode material

• Published in: Frontiers of materials science Vol. 17; no. 3
• Main Authors: Gao, Xicheng, Bi, Jianqiang, Xie, Lulin, Liu, Chen
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.09.2023; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Electrode materials; Electrodes; Emission analysis; Exfoliation; Field emission microscopy; Materials Science; Nanostructure; Nickel ferrites; Photoelectrons; Pore size; Research Article; Supercapacitors; X ray photoelectron spectroscopy; WS; composite; chemical liquid exfoliation; NiFe; O; supercapacitor
• ISSN: 2095-025X; 2095-0268
• DOI: 10.1007/s11706-023-0656-6

Few-layers WS 2 was obtained through unique chemical liquid exfoliation of commercial WS 2 . Results showed that after the exfoliation process, the thickness of WS 2 reduced significantly. Moreover, the NiFe 2 O 4 nanosheets/WS 2 composite was successfully synthesized through a facile hydrothermal method at 180 °C, and then proven by the analyses of field emission scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The composite showed a high specific surface area of 86.89 m 2 ·g −1 with an average pore size of 3.13 nm. Besides, in the three-electrode electrochemical test, this composite exhibited a high specific capacitance of 878.04 F·g −1 at a current density of 1 A·g −1 , while in the two-electrode system, the energy density of the composite could reach 25.47 Wh·kg −1 at the power density of 70 W·kg −1 and maintained 13.42 Wh·kg −1 at the higher power density of 7000 W·kg −1 . All the excellent electrochemical performances demonstrate that the NiFe 2 O 4 nanosheets/WS 2 composite is an excellent candidate for supercapacitor applications.