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

Abstract

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.

MoO2/t-C3N4 Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries

“…32−34 MoO 2 /t-C 3 N 4 has a distinct diffraction peak at 26.1°, represented by the (−111) plane of MoO 2 (JCPDS 32−0671). 35,36 The S content in the cathode material is confirmed by a TGA. t-C 3 N 4 /S and MoO 2 / t-C 3 N 4 /S show 70.7 and 72.6% S content, respectively (Figure 2b).…”

“…t-C 3 N 4 and MoO 2 /t-C 3 N 4 XRD patterns show weak peaks at 13.1° and distinct peaks at 27.7° (Figure a). The former is related to the in-plane (100) repeated motifs of the tri-s-triazine network, while the latter representate the interlayer stacking (002) of graphite carbon nitrid. − MoO 2 /t-C 3 N 4 has a distinct diffraction peak at 26.1°, represented by the (−111) plane of MoO 2 (JCPDS 32–0671). , The S content in the cathode material is confirmed by a TGA. t-C 3 N 4 /S and MoO 2 /t-C 3 N 4 /S show 70.7 and 72.6% S content, respectively (Figure b).…”

Boosting reaction kinetics of polycrystalline phase Fe7S8/FeS2 heterostructures encapsulated in hollow carbon nanofibers for superior fast sodium storage

“…Compared with NHCFs-FeS 2 , the binding energy of the peaks belonging to Fe 3+ is shied towards the lower energy, conrming that there is an electronic interaction between Fe 7 S 8 and FeS 2 , and electrons are partially transferred from NHCFs-Fe 7 S 8 to NHCFs-FeS 2 . [37][38][39] Compared with the other two samples, the Fe 2+ peaks of the polycrystalline phase are shied towards the direction of higher binding energy, indicating the coupling between Fe shown in Fig. S10, † indicating that the metal nanoparticles in the polycrystalline phase are most stable in bonding with carbon tubes, which further contributes to the stability of the material during the charge/discharge process.…”

Facile preparation of MoO3@Mo2CT x nanocomposite with high lithium storage performance by in situ oxidation

“…This is because molybdenum compounds can form stable structures with MoO 3 /MoO 2 , due to the same molybdenum element. The examples of the composites are MoO 2 /MoP, MoO 2 /Mo 2 N and MoO 2 /MoS 2 [11][12][13]. MoP and Mo 2 N improve the performance of MoO 2 by electronic structure modulation.…”