Evolution of Stabilized 1T‐MoS₂ by Atomic‐Interface Engineering of 2H‐MoS₂/Fe−N_<i>x</i> towards Enhanced Sodium Ion Storage

Abstract

Abstract Metallic conductive 1T phase molybdenum sulfide (MoS 2 ) has been identified as promising anode for sodium ion (Na + ) batteries, but its metastable feature makes it difficult to obtain and its restacking during the charge/discharge processing result in part capacity reversibility. Herein, a synergetic effect of atomic‐interface engineering is employed for constructing 2H‐MoS 2 layers assembled on single atomically dispersed Fe−N−C (SA Fe−N−C) anode material that boosts its reversible capacity. The work‐function‐driven‐electron transfer occurs from SA Fe−N−C to 2H‐MoS 2 via the Fe−S bonds, which enhances the adsorption of Na + by 2H‐MoS 2 , and lays the foundation for the sodiation process. A phase transfer from 2H to 1T/2H MoS 2 with the ferromagnetic spin‐polarization of SA Fe−N−C occurs during the sodiation/desodiation process, which significantly enhances the Na + storage kinetics, and thus the 1T/2H MoS 2 /SA Fe−N−C display a high electronic conductivity and a fast Na + diffusion rate.