Exploitation of superior anode materials is a key step to realize the pursuit of high‐performance sodium‐ion batteries. In this work, a reduced graphene oxide‐wrapped FeSe₂ (FeSe₂@rGO) composite derived from a metal–organic framework (MOF) was synthesized to act as the anode material of sodium‐ion batteries. The MOF‐derived carbon framework with high specific surface area could relieve the large volumetric change during cycling and ensure the structural stability of electrode materials. Besides, the rGO conductive network allowed to promote the electron transfer and accelerate reaction kinetics as well as to provide a protection role for the internal FeSe₂. As a result, the FeSe₂@rGO composite exhibited a high capacity of 350 mAh g⁻¹ after 600 cycles at 5 A g⁻¹. Moreover, in situ XRD was conducted to explore the reaction mechanism of the FeSe₂@rGO composite upon sodiation/de‐sodiation. Importantly, the presented method for the synthesis of MOF‐derived materials wrapped by rGO could not only be used for FeSe₂@rGO‐based sodium‐ion batteries but also for the different transition metal‐based composite materials for electrochemical devices, such as water splitting and sensors.

中文翻译：

---

rGO包裹的FeSe2复合材料实现了高效的钠离子存储

开发优质阳极材料是实现高性能钠离子电池的关键一步。在这项工作中，合成了一种还原的氧化石墨烯包裹的FeSe ₂（FeSe ₂ @rGO）复合材料，它来自金属有机骨架（MOF），用作钠离子电池的负极材料。MOF衍生的高比表面积碳骨架可缓解循环过程中的大体积变化，并确保电极材料的结构稳定性。此外，rGO导电网络可以促进电子转移并加快反应动力学，并为内部FeSe ₂提供保护作用。结果，FeSe ₂ @rGO复合材料表现出350 mAh g的高容量^-1后5 A G 600次循环^-1。此外，进行了原位XRD研究了FeSe ₂ @rGO复合材料在加盐/脱盐后的反应机理。重要的是，本发明提出的由rGO包裹的MOF衍生材料的合成方法不仅可以用于FeSe ₂ @rGO基钠离子电池，而且还可以用于电化学设备的不同过渡金属基复合材料，例如水分裂和传感器。