On account of increasing demand for energy storage devices, sodium‐ion batteries (SIBs) with abundant reserve, low cost, and similar electrochemical properties have the potential to partly replace the commercial lithium‐ion batteries. In this study, a facile metal‐organic framework (MOF)‐derived selenidation strategy to synthesize in situ carbon‐encapsulated selenides as superior anode for SIBs is rationally designed. These selenides with particular micro‐ and nanostructured features deliver ultrastable cycling performance at high charge–discharge rate and demonstrate ultraexcellent rate capability. For example, the uniform peapod‐like Fe₇Se₈@C nanorods represent a high specific capacity of 218 mAh g⁻¹ after 500 cycles at 3 A g⁻¹ and the porous NiSe@C spheres display a high specific capacity of 160 mAh g⁻¹ after 2000 cycles at 3 A g⁻¹. The current simple MOF‐derived method could be a promising strategy for boosting the development of new functional inorganic materials for energy storage, catalysis, and sensors.

中文翻译：

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通用金属有机框架（MOF）衍生的硒化策略，用于原位碳封装的金属硒化物作为钠离子电池的高级阳极

由于对能量存储设备的需求不断增长，具有丰富储备，低成本和类似电化学性能的钠离子电池（SIB）有潜力部分取代商用锂离子电池。在这项研究中，合理设计了一种由金属有机骨架（MOF）衍生的硒化策略，以原位合成碳包裹的硒化物，作为SIB的优良阳极。这些具有特殊的微结构和纳米结构的硒化物，在高充放电速率下具有超稳定的循环性能，并具有极佳的倍率性能。例如，均匀的豆荚状Fe ₇ Se ₈ @C纳米棒在3 A g ^-1下经过500次循环后具有218 mAh g ^-1的高比容量。NiSe @ C多孔球在3 A g ^-1下经过2000次循环后显示出160 mAh g ^-1的高比容量。当前简单的基于MOF的方法可能是促进用于能量存储，催化和传感器的新型功能性无机材料开发的有前途的策略。