3D flower-like hollow MXene@MoS2 heterostructure for fast sodium storage

Kaihang She; Ying Huang; Wanqing Fan; Meng Yu; Jiaxin Zhang; Chen Chen

doi:10.1016/j.jcis.2023.11.108

3D flower-like hollow MXene@MoS₂ heterostructure for fast sodium storage

J Colloid Interface Sci. 2024 Feb 15:656:270-279. doi: 10.1016/j.jcis.2023.11.108. Epub 2023 Nov 19.

Authors

Kaihang She¹, Ying Huang², Wanqing Fan¹, Meng Yu¹, Jiaxin Zhang¹, Chen Chen³

Affiliations

¹ MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
² MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: yingh@nwpu.edu.cn.
³ School of Electrical Engineering, Xi'an University of Technology, Xi'an 710048, China. Electronic address: chenchen@xaut.edu.cn.

PMID: 37995397
DOI: 10.1016/j.jcis.2023.11.108

Abstract

Constructing an anode with fast electron transport and high cycling stability is important but challenging for large-scale applications of sodium-ion batteries (SIB). In this study, hierarchical flower-like MXene structures were synthesized using poly (methyl methacrylate) (PMMA) microsphere as templates. Subsequently, a straightforward hydrothermal reaction was utilized to anchor small-sized MoS₂ nanosheets. The resulting MXene@MoS₂ heterostructure exhibits a distinctive three-dimensional (3D) porous hollow architecture. This structure effectively addresses challenges related to self-aggregation of MoS₂ nanosheets and volume expansion of the electrode material during Na⁺ insertion/extraction processes. Furthermore, the robust hetero-interface supports fast and stable electron transfer, thereby enhancing electrochemical reaction kinetics. The prepared MXene@MoS₂ electrode demonstrates the specific capacity of 682.1 mA h g^-1 at 0.2 A/g and the reversible capacity of 494.4 mA h g^-1 after 1000 cycles at 5 A/g. It is noteworthy that the full battery assembled with the composite material as the anode can still maintain the capacity of 456.2 mA h g^-1 after 80 cycles at 0.5 A/g. This outstanding reversible capacity and sustained stability over numerous cycles highlights its potential for a wide range of applications.

Keywords: Anode; MXene; MoS(2); Porous hollow heterostructure; Sodium-ion batteries.