<br>富勒烯嵌入 MXene 实现超长周期钠离子存储,Advanced Functional Materials

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富勒烯嵌入 MXene 实现超长周期钠离子存储
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-05-19 , DOI: 10.1002/adfm.202400185
Xing Wang _{1,

2} , Yizhe Wang ₁ , Kun Ni ₁ , Jian Guan ₃ , Muqing Chen ₄ , Yanwu Zhu ₁ , Shangfeng Yang _{1,

2}

Affiliation

二维层状MXene基材料由于其层状结构而被用作钠离子电池（SIB）的阳离子嵌入电极材料，但在Na ⁺插入和脱嵌过程中会发生自发重新堆积，导致反应动力学缓慢和循环稳定性差。在此，利用水溶性C ₆₀衍生物与亲水性MXene纳米片之间的低温水热反应，将富勒烯C ₆₀共价嵌入到Ti ₃ C ₂ T _x MXene纳米片的层间，从而扩大了MXene纳米片的层间距。 12.8 至 14.1 Å，从而延迟了自重堆叠。此外，C ₆₀强大的电子提取能力有利于电子从MXene转移到C ₆₀ ，从而在Na ⁺传输过程中实现更快的电荷传输。所制备的C ₆₀ @MXene杂化材料被用作SIB的新型阳极，表现出出色的电化学性能和超长的循环稳定性。基于C ₆₀ @MXene的SIB在300次循环后在0.1 A g ^-1下提供了226.8 mAh g ^-1的比容量，这超过了原始MXene阳极获得的比容量，并且在10次循环后在1 A g ^-1下保留了94.5%的容量000 个周期。 DFT模拟证实C ₆₀引起的层间距扩大有利于Na ⁺迁移，这有助于提高电化学性能和循环稳定性。

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Fullerene Intercalation of MXene Toward Super-Long-Cycle Sodium Ion Storage

2D layered MXene-based materials are applied as cation-intercalation electrode materials for sodium-ion batteries (SIBs) due to their layered structures but suffer from spontaneous restacking during Na⁺ insertion and deintercalation processes, resulting in sluggish reaction kinetics and poor cycling stability. Herein, fullerene C₆₀ is intercalated covalently into the interlayer of Ti₃C₂T_x MXene nanosheets by using a low-temperature hydrothermal reaction between a water-soluble C₆₀ derivative and hydrophilic MXene nanosheets, resulting in enlarged interlayer spacing of MXene nanosheets from 12.8 to 14.1 Å and consequently retarded self-restacking. Moreover, the strong electron extraction ability of C₆₀ facilitates electron transfer from MXene to C₆₀, enabling faster charge transport during Na⁺ transportation. The as-prepared C₆₀@MXene hybrid is applied as a novel anode of SIBs, exhibiting outstanding electrochemical performance and super-long cycling stability. C₆₀@MXene-based SIB delivers a specific capacity of 226.8 mAh g⁻¹ at 0.1 A g⁻¹ after 300 cycles, which surpasses that obtained from the pristine MXene anode, and retains 94.5% capacity at 1 A g⁻¹ after 10 000 cycles. DFT simulations confirm that C₆₀-induced enlarged interlayer spacing benefits Na⁺ migrations, which is responsible for improved electrochemical performance and cycling stability.

更新日期：2024-05-19

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