A dual heterostructure enables the stabilization of 1T-rich MoSe2 for enhanced storage of sodium ions
Publication Name
Chemical Science
Abstract
Electron injection effectively induces the formation of a 1T-rich phase to address the low conductivity of MoSe2. Nevertheless, overcoming the inherent metastability of the 1T phase (particularly during the conversion reactions that entail the decomposition-reconstruction of MoSe2 and volume expansion) remains a challenge. Guided by DFT results, we designed a composite with bimetal selenides-based heterostructures anchored on reduced graphene oxide (rGO) nanosheets (G-Cu2Se@MoSe2) to obtain stabilized 1T-rich MoSe2 and enhanced ion transfer. The construction of 1T-rich MoSe2 and built-in electric fields (BiEF) through electron transfer at the heterointerfaces were realized. Moreover, the rGO-metal selenides heterostructures with in situ-formed interfacial bonds could facilitate the reconstruction of the 1T-rich MoSe2-involved heterostructure and interfacial BiEF. Such a dual heterostructure endowed G-Cu2Se@MoSe2 with an excellent rate capability with a capacity of 288 mA h g−1 at 50 A g−1 and superior cycling stability with a capacity retention ratio of 89.6% (291 mA h g−1) after 15 000 cycles at 10 A g−1. Insights into the functional mechanism and structural evolution of the 1T MoSe2-involved dual heterostructure from this work may provide guidelines for the development of MoSe2 and phase-engineering strategies for other polymorphistic materials.
Open Access Status
This publication may be available as open access
Volume
15
Issue
28
First Page
11134
Last Page
11144
Funding Number
52202119
Funding Sponsor
National Natural Science Foundation of China