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The two-dimensional structural features of covalent organic frameworks (COFs) can promote the electrochemical storage of cations like H + , Li + , and Na + through both faradaic and non-faradaic processes. However, the electrochemical storage of cations like Zn 2+ ion is still unexplored although it bears a promising divalent charge. Herein, for the first time, we have utilized hydroquinone linked β-ketoenamine COF acting as a Zn 2+ anchor in an aqueous rechargeable zinc ion battery. The charge-storage mechanism comprises of an efficient reversible interlayer interaction of Zn 2+ ions with the functional moieties in the adjacent layers of COF (-182.0 kcal mol -1 ). Notably, due to the well-defined nanopores and structural organization, a constructed full cell, displays a discharge capacity as high as 276 mA h g -1 at a current rate of 125 mA g -1 .

Zinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery