Two-dimensional (2D) transition metal borides (MBenes) have emerged as a rising star and hold great potential promise for catalysis and metal ion batteries owing to a well-defined layered structure and excellent electrical conductivity. Unlike well-studied graphene, perovskite and MXene materials in various fields, the research about MBene is still in its infancy. The inadequate exploration of efficient etching methods impedes their further study. Herein, we put forward an efficient microwave-assisted hydrothermal alkaline solution etching strategy for exfoliating MoAlB MAB phase into 2D MoB MBenes with a well accordion-like structure, which displays a remarkable electrochemical performance in sodium ion batteries (SIBs) with a reversible specific capacity of 196.5 mAh g at the current density of 50 mA g, and 138.6 mAh g after 500 cycles at the current density of 0.5 A g. The underlying mechanism toward excellent electrochemical performance are revealed by comprehensive theoretical simulations. This work proves that MBene is a competitive candidate as the next generation anode of sodium ion batteries.

中文翻译：

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快速合成高性能钠离子电池二维MoB MBene负极


二维（2D）过渡金属硼化物（MBenes）已成为后起之秀，由于其明确的层状结构和优异的导电性，在催化和金属离子电池方面具有巨大的潜在前景。与各领域研究充分的石墨烯、钙钛矿和MXene材料不同，MBene的研究仍处于起步阶段。对有效蚀刻方法的探索不充分阻碍了它们的进一步研究。在此，我们提出了一种有效的微波辅助水热碱性溶液蚀刻策略，将 MoAlB MAB 相剥离成具有良好手风琴状结构的 2D MoB MBene，该策略在具有可逆比容量的钠离子电池（SIB）中表现出卓越的电化学性能在50 mA g-1的电流密度下，其容量为196.5 mAh g；在0.5 A g-1的电流密度下，循环500次后，容量为138.6 mAh g。通过全面的理论模拟揭示了优异电化学性能的潜在机制。这项工作证明 MBene 是下一代钠离子电池负极的有力候选者。