Boosting Sodium Storage in Two-Dimensional Phosphorene/Ti3C2Tx MXene Nanoarchitectures with Stable Fluorinated Interphase
Boosting Sodium Storage in Two-Dimensional Phosphorene/Ti3C2Tx MXene Nanoarchitectures with Stable Fluorinated Interphase
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DOI：
10.1021/acsnano.0c00177
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发表时间：
2020-03-24
期刊：
影响因子：
17.1
通讯作者：
Wang, Guoxiu
中科院分区：
文献类型：
--
作者：
Guo, Xin;Zhang, Wenxue;Wang, Guoxiu
将互补的二维（2D）材料堆叠到混合结构中，对于容量增强、快速充电和长寿命的电池来说是理想的。然而，用于储能的二维异质结构仍不发达，库仑效率低等相关问题有待解决。在此，我们报道了一种磷烯/MXene杂化阳极，该阳极具有原位形成的氟化界面，用于稳定和快速的钠储存。磷烯纳米片与Ti3C2Tx MXene的结合不仅促进了电子和钠离子的迁移，而且减轻了磷烯Ph磷烯的结构膨胀，从而提高了杂化阳极的循环性能。x射线光电子能谱深入分析表明，氟端接MXene通过在阳极表面形成富氟化合物来稳定固体电解质界面。密度泛函理论计算证实，在磷烯/MXene异质结构中，特别是在磷烯/Ti3C2F2中，钠的亲和和扩散动力学显著增强。结果表明，混合电极在0.1 a g（-1）下具有535 mAh g（-1）的高可逆容量，并且在无氟碳酸盐电解质中具有优异的循环性能（在1 a g（-1）下循环1000次后具有343 mAh g（-1）的容量保留率为87%）。
The stacking of complementary two-dimensional (2D) materials into hybrid architectures is desirable for batteries with enhanced capacity, fast charging, and long lifetime. However, the 2D heterostructures for energy storage are still underdeveloped, and some associated problems like low Coulombic efficiencies need to be tackled. Herein, we reported a phosphorene/MXene hybrid anode with an in situ formed fluorinated interphase for stable and fast sodium storage. The combination of phosphorene nanosheets with Ti3C2Tx MXene not only facilitates the migration of both electrons and sodium cations but also alleviates structural expansion of phosphorene Ph osphorcne and thereby improves the cycling performance of the hybrid anode. X-ray photoelectron spectroscopy in-depth analysis reveals that the fluorine terminated MXene stabilize the solid electrolyte interphase by forming fluorine-rich compounds on the anode surface. Density functional theory calculations confirm that the sodium affinities and diffusion kinetics are significantly enhanced in the phosphorene/MXene heterostructure, particularly in the phosphorene/Ti3C2F2. As a result, the hybrid electrode achieved a high reversible capacity of 535 mAh g(-1) at 0.1 A g(-1) and superior cycling performance (343 mAh g(-1) after 1000 cycles at 1 A g(-1) with a capacity retention of 87%) in a fluorine-free carbonate electrolyte.