Synergistically Designed Dual Interfaces to Enhance the Electrochemical Performance of MoO2/MoS2 in Na‐ and Li‐Ion Batteries

It is indispensable to develop and design high capacity, high rate performance, long cycling life, and low‐cost electrodes materials for lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs). Herein, MoO2/MoS2/C, with dual heterogeneous interfaces, is designed to induce a built‐in electric field, which has been proved by experiments and theoretical calculation can accelerate electrochemical reaction kinetics and generate interfacial interactions to strengthen structural stability. The carbon foam serves as a conductive frame to assist the movement of electrons/ions, as well as forms heterogeneous interfaces with MoO2/MoS2 through CS and CO bonds, maintaining structural integrity and enhancing electronic transport. Thanks to these unique characteristics, the MoO2/MoS2/C renders a significantly enhanced electrochemical performance (324 mAh g−1 at 1 A g−1 after 1000 cycles for SIB and 500 mAh g−1 at 1 A g−1 after 500 cycles for LIBs). The current work presents a simple, useful and cost‐effective route to design high‐quality electrodes via interfacial engineering. The MoO2/MoS2/C electrode exhibits the distinguished electrochemical performance (324 mAh g−1 after 1000 cycles at 1 A g−1 for sodium ion batteries and 500 mAh g−1 after 500 cycles at 1 A g−1 for lithium ion batteries) benefit from the synergistic effect of dual heterogeneous interface and 3D interconnected structures.