A dual heterostructure enables the stabilization of 1T-rich MoSe for enhanced storage of sodium ions.

Electron injection effectively induces the formation of a 1T-rich phase to address the low conductivity of MoSe. Nevertheless, overcoming the inherent metastability of the 1T phase (particularly during the conversion reactions that entail the decomposition-reconstruction of MoSe 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-CuSe@MoSe) to obtain stabilized 1T-rich MoSe and enhanced ion transfer.