Abstract
Metal-organic framework (MOF) has attracted increasing research interest for electrochemical applications due to their high porosity and tailorable structure. In this work, binder-free nickel terephthalate-based MOF nanosheet arrays grown on nickel foam (NF@Ni-BDC) are set as an excellent anode for alkali metal ion batteries. Benefiting from the propelled electrochemical reaction kinetics, enhanced charge diffusion efficiency, and fast infiltration of electrolyte endowed by the self-supported nanoarrays electrode architecture, high capacity of 162 mAh g−1 can be obtained at a high current density of 400 mA g−1 for sodium ion battery, and capacity of 116 mAh g−1 can be retained after 1000 cycles at 100 mA g−1 for potassium ion battery, which demonstrate remarkable rate capability and cycling performance. It is verified that the organic linker of Ni-BDC plays a vital role in ionic insertion and desertion processes, while the metal central ions mainly serve as the scaffold to maintain the structural integrity.
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