A facile hydrothermal approach has been successfully adopted to synthesize two‐dimensional Nb₂CT_x MXene, targeting sodium storage approach in two‐dimensional MXene. As an anode material for sodium‐ion batteries (SIBs), as‐prepared Nb₂CT_x MXene delivered a stable electrochemical performance of ∼102 mA h g⁻¹ after 500 cycles at a current density of 1.0 A g⁻¹. Further, the full cell comprising of Na₃V₂(PO₄)₃@C cathode and Nb₂CT_x MXene anode also rendered a reversible capacity of 181 mA h g⁻¹ at a current density of 100 mA g⁻¹ after 50 cycles. The good sodium storage could be ascribed to the contribution of hybrid pseudocapacitance, effectively promoted charge storage, unique layered structure and expedited dynamic diffusion of ions. Accordingly, these facts enabled the Nb₂CT_x MXene to be a promising candidate as an anode material for sodium‐ion batteries.

中文翻译：

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混合电荷存储路径到Nb2CTx MXene作为钠离子电池的阳极

成功地采用了一种简便的水热方法来合成二维Nb ₂ CT _x MXene，其目标是二维MXene中的钠存储方法。作为钠离子电池（SIB）的负极材料，经过制备的Nb ₂ CT _x MXene经过500次循环后，在1.0 A g ^-1的电流密度下可提供约102 mA h g ^-1的稳定电化学性能。此外，由Na ₃ V ₂（PO ₄）₃ @C阴极和Nb ₂ CT _x MXene阳极组成的完整电池还具有181 mA h g ^-1的可逆容量。在50个循环后，电流密度为100 mA g ^-1。良好的钠存储可以归因于混合伪电容的贡献，有效地促进了电荷存储，独特的分层结构以及离子的动态扩散。因此，这些事实使Nb ₂ CT _x MXene成为钠离子电池负极材料的有前途的候选者。