Self-assembled molybdenum disulfide nanoflowers regulated by lithium sulfate for high performance supercapacitors

Yunan Li; Yang Sun; Sen Zhang; Xueling Wu; Meng Song; Mingli Jiao; Qi Qin; Liwei Mi

doi:10.1039/d3ra04852g

Self-assembled molybdenum disulfide nanoflowers regulated by lithium sulfate for high performance supercapacitors

RSC Adv. 2023 Sep 4;13(38):26509-26515. doi: 10.1039/d3ra04852g.

Authors

Yunan Li^{1

2}, Yang Sun¹, Sen Zhang¹, Xueling Wu¹, Meng Song¹, Mingli Jiao¹, Qi Qin¹, Liwei Mi²

Affiliations

¹ School of Materials and Chemical Engineering, Zhongyuan University of Technology Zhengzhou 450007 China yunanli@zut.edu.cn qq@zut.edu.cn.
² Center for Advanced Materials Research, Henan Key Laboratory of Functional Salt Materials, Zhongyuan University of Technology Zhengzhou 450007 China mlwzzu@163.com.

Abstract

Recently, molybdenum disulfide (MoS₂) has been extensively investigated as a promising pseudocapacitor electrode material. However, MoS₂ usually exhibits inferior rate capability and cyclability, which restrain its practical application in energy storage. In this work, MoS₂ nanoflowers regulated by Li₂SO₄ (L-MoS₂) are successfully fabricated via intercalating solvated Li ions. Via appropriate intercalation of Li₂SO₄, MoS₂ nanosheets could self-assemble to form L-MoS₂ nanoflowers with an interlayer spacing of 0.65 nm. Due to the large specific surface area (23.7 m² g^-1) and high 1T phase content (77.5%), L-MoS₂ as supercapacitor electrode delivers a maximum specific capacitance of 356.7 F g^-1 at 1 A g^-1 and maintains 49.8% of capacitance retention at 20 A g^-1. Moreover, the assembled L-MoS₂ symmetric supercapacitor (SSC) device displays an energy density of 6.5 W h kg^-1 and 79.6% of capacitance retention after 3000 cycles.