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Horizontal oscillation processed large MXene with Low Ti–Ti coordination for fast sodium storage

Science China Chemistry 2024年第11期67卷 3729-3738页

作者： Hang Wang Xingwu Zhai Yujian Xia Zhixin Sun Tianchen Wei Guangyu Chen Yuhuan Li Xinfeng Tang Liang Wu Zhaodi Fan Hongjun Zhang Bangjiao Ye Xueyuan Leng Min Zhou Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China National Synchrotron Radiation Laboratory University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China School of Aerospace Engineering and Applied Mechanics Tongji University

MXene stands out as a rising family of transition metal carbides/nitrides with exceptional size-dependent properties and versatile potential applications. However, the realization of large MXene with a controllable surface at atomic level remains challenging to keep the balance among the conductivity, stability and activity. Herein, the horizontal oscillation-induced delamination（HOD）strategy is proposed to acquire Ti3C2flakes with large size and low Ti–Ti coordination（HO-Ti3C2）. The average size of the asobtained flakes can reach 6.48 μm to keep the overall conductive skeleton and merits from large size. Simultaneously, metal atoms at surface can be partially removed due to the enhanced local vibrational turbulence during the reciprocating horizontal oscillation process. Such MXenes with clear and unique surface states exhibit high potentials in ion adsorption together with satisfied electric conductivity and stability. As proof of concept, HO-Ti3C2anode exhibits remarkable rate capability and longterm stability during sodium storage. A capacity of 100.5 m Ah g-1with a long-life cycle（4,500 cycles） at a high rate of 1.0 A g-1originates from the increased s-d interaction between Na and Ti. Therefore, the HOD strategy provides a controllable surface design to promote the clear criteria into size-dependent research on MXene.

关键词： horizontal oscillation induced delamination shear force large flakes coordination environment fast sodium storage

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