In spite of the low-cost and abundant potassium resources, the potential commercialization of potassium-ion batteries (PIBs) is still confined by the large-sized K⁺ ions and sluggish kinetic process. A flexible free-standing advanced anode for PIBs is synthesized by tactfully incorporating dual anionic vacancies on MoSSe arrays in combination of carbon nanofiber membrane ([email protected]). The vacancy-rich MoSSe arrays in [email protected] dramatically enhance the adsorption of K⁺ ions, leading to a higher capacity of 370.6 mAh g^-1 at 0.1 A g^-1 over 60 cycles as compared with that 168.5 mAh g^-1 of vacancy-free [email protected] Meanwhile, the density functional theory (DFT) calculations demonstrate a facilitated ability for K⁺ insertion into v-MoSSe interlayers with a much more negative adsorption value of -1.74 eV than that (0.53 eV) of vacancy-free MoSSe. The thousands of carbon nanofiber-supported three-dimensional frameworks can not only inhibit the agglomeration of MoSSe nanosheets, but also remit the volume expansion and avoid possible collapse of the nanostructures during cycling, resulting into a high capacity retention of 220.5 mAh g⁻¹ at 0.5 A g⁻¹ after 1000 cycles. Therefore, this work uncovers the relationship between vacancy engineering and potassium-ion storage performance, guiding a feasible route to develop potential materials for potassium-ion battery.

尽管钾肥价格低廉且资源丰富，但钾离子电池（PIB）的潜在商业化仍受限于大型K ⁺离子和缓慢的动力学过程。通过在碳纳米纤维膜上将MoSSe阵列上的两个阴离子空位巧妙地结合在一起，来合成用于PIB的柔性独立式高级阳极（[受电子邮件保护]）。在[电子邮件保护]富含空位莫斯阵列极大地提高K的吸附⁺离子，从而导致更高的容量的370.6毫安克^-1在0.1 A克^-1超过60个循环与168.5毫安克，比^-1无空位[受电子邮件保护]同时，密度泛函理论（DFT）计算表明，K ⁺插入v-MoSSe中间层的能力增强，其负吸附值比空位（0.53 eV）高-1.74 eV。免费的MoSSe。数以千计的碳纳米纤维负载三维框架不仅能抑制莫斯纳米片的附聚，而且免除的体积膨胀，并避免在循环过程中，纳米结构的可能崩溃，从而导致成220.5毫安g的高容量维持^-1在0.5 A g ^-1经过1000个周期。因此，这项工作揭示了空位工程与钾离子存储性能之间的关系，为开发潜在的钾离子电池材料提供了可行的途径。