本研究提出一种Mn ²⁺插层策略用于优化V₂C MXene的储钠性能。Mn ²⁺的插层不仅扩大了V₂C MXene的层间距同时形成了V-O-Mn 共价键, 有利于稳定V₂C的结构, 抑制Na ⁺脱嵌过程中由于体积变化引起的结构坍塌。结果表明, 插层后的V₂C MXene(V₂C@Mn)电极在电流密度为0.05 A·g ^-1时具有425 mAh·g ^-1的高比容量, 并且经过1200次长循环后容量还有70%保留。V₂C@Mn优异的性能表明阳离子插层调控的MXene在Na ⁺存储方面具有潜在的应用前景。

Mn ²⁺ intercalation strategy to optimize the sodium storage performance of V₂C MXene was studied. The intercalated Mn ²⁺ not only enlarged the interlayer spacing of V₂C MXene but also formed a V-O-Mn covalent bond, which was beneficial to stabilize the structure of V₂C and inhibit the structural collapse caused by volume change during Na ⁺ decalation or intercalation. As a result, the intercalated V₂C MXene (V₂C@Mn) electrode showed a high specific capacity of 425 mAh·g ^-1 at the current density of 0.05 A·g ^-1, and 70% retention after 1200 cycles. This result clearly suggests that cations intercalated MXene has a great prospect in Na ⁺ storage.