Heterogeneous structure of lamellar Fe3O4/C@Ti3C2 as cathode for high-performance magnesium-sulfur batteries

• Published in: Journal of power sources 2025-02, Vol.630, p.236061, Article 236061
• Main Authors: Yan, Xiaoyan, Guo, Weiguang, Du, Wentao, Zhang, Xiaohua, Zhao, Xinxin, Cheng, Zhenxiang, Liu, Baosheng
• Format: Article
• Language: English
• Subjects: Cathode material; Fe3O4/C@Ti3C2; MOFs derived; MSBs
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2024.236061

Rechargeable Magnesium Sulfur Batteries (MSBs) are expected to be an efficient energy storage solution due to their high energy density, safety and cost-effectiveness. However, their widespread application is limited by challenges such as high overpotential, low sulfur utilization and poor conductivity of the discharge products. To overcome these obstacles, we have developed a novel Fe3O4/C@Ti3C2 heterostructure using MXene lamellae and Fe-MOFs (Iron-based Metal-organic frameworks). The MXene framework in this heterostructure increases electron and ion transport rates. This combined effect greatly improves the electrochemical efficiency of the Fe3O4/C@Ti3C2 heterojunction, resulting in a significant increase in sulfur utilization and a cycle-specific capacity of 1112.5 mAh g−1. Remarkably, this electrode retains a capacity of 834.2 mAh g−1 after 100 cycles. Valuable insights and directions have been provided for the design of advanced cathode structures for high-performance reversible MSBs. [Display omitted] •Fe-MOF derivatives are uniformly distributed on the surface of Mxene.•Heterojunction effectively alleviates the shuttle effect of polysulfide.•Fe3O4/C@Ti3C2/S cathodes offer high specific capacity and long cycles.