Synthesis of Mo2Al1-xB2(MBene)by hydrofluoric acid method and electrochemical properties study
The large-scale development of MBene prepared from bulk ternary metal borides(MAB phases)as a novel 2D material has received increasing attention.However,its preparation strategy has been limited.In this work,Mo2Al1-xB2(MBene)2D material with a typical accordion structure was successfully synthesized through a detailed study of the optimal preparation process conditions for etching the Al layer from MoAlB using the hydrofluoric acid method.In addition,X-ray diffraction and XPS were used to analyze in detail the crystal struc-ture and surface chemical state of MBene.The micro-morphology of MBene has been analyzed by scanning elec-tron microscopy in combination with energy spectroscopy.The results showed that a clear accordion layer-like structure was present in the MBene synthesized by etching at 60 ℃ for 72 h(referred to as 60-72 h).When used as anodes for LIBs,the 60-72 h samples exhibited excellent electrochemical performance,with a reversible spe-cific capacity of 228.0 mAh/g after 500 cycles at a current density of 1 A/g.The excellent electrochemical per-formance is mainly attributed to the good electrical conductivity and fast Li-ion diffusion channel of the 2D MBe-ne,resulting in a high pseudo-capacitance effect.The pseudo-capacitance contribution reaches～86.7％at a scan rate of 2 mV/s.
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