Metal-organic framework-induced edge-riched growth of layered Bi2Se3 towards ultrafast Na-ion storage

Inner design and effective regulation of interlayer are the key factors for optimizing the capacity deliver. Herein, this work carries out precise regulation on crystalline type and facets orientation by using ordered guidance of Bi-MOF to control the metal crystal growth, and preferably oriented-growth along (00l) facets in Bi2Se3 is realized, the influence of the dominant-exposed facets on Na-storage is investigated. Experimental investigations and first-principle calculations indicates that perfect oriented growth along (00l) facets of monocrystalline Bi2Se3, and open 2D interlayer structure provides a large amount of electrochemically active areas and kinetically favorable interlayers. The elaborate design structure can not only afford more channels for Na+, but also accelerate the Na+ insertion/extraction among the host material. Highly conductive network is constructed by C–O–Bi oxygen-bridge bond. The Bi2Se3–C/G-1 composites can exhibit a high reversible capacity of 377 mAh g−1 and extraordinary rate performance with an extremely low capacity fading of 12% with current increase from 0.2 to 10 A g−1. The developed two-dimensional oriented-arranged interlayer and highly exposed edges effectively accelerates the diffusion of Na+, reduces the phase-transformation resistance, improves the reaction activity. The stronger interfacial reaction between graphene and bismuth selenide also provides an enhanced pathway for electrons.