FeSe@C with a 3D porous interconnected carbon framework is used as the anode for potassium ion batteries (PIBs). FeSe@C has a relatively large specific surface area and a superior microporous and mesoporous structure, thus facilitating the storage and transportation of potassium ions. When tested in PIBs as an anode, FeSe@C shows good specific capacity of 298.5 mA h g⁻¹ after 200 cycles at 500 mA g⁻¹, thus indicating good cycle stability. In addition, a possible potassium storage mechanism is explored. Moreover, the diffusion coefficient of potassium ions (D_K) of FeSe@C is 1.67 × 10⁻¹⁰ cm² s⁻¹ is calculated. Therefore, the FeSe@C composite is expected to become the next-generation anode material for PIBs.

中文翻译：

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3D碳骨架支持的FeSe用于高性能钾离子电池

具有3D多孔互连碳骨架的FeSe @ C用作钾离子电池（PIB）的阳极。FeSe @ C具有相对较大的比表面积和优异的微孔和中孔结构，因此有利于钾离子的储存和运输。当在作为阳极的PIB中进行测试时，FeSe @ C在500 mA g ^-1下200次循环后显示出298.5 mA hg ^-1的良好比电容，因此表明良好的循环稳定性。另外，探索了可能的钾存储机制。此外，钾离子（的扩散系数d _ķ FESE的）@ C是1.67×10 ^-10厘米^2个小号^-1计算。因此，FeSe @ C复合材料有望成为PIB的下一代阳极材料。