Zinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery
Abdul Khayum M1,2, Meena Ghosh1,2, Vidyanand Vijayakumar1,2
1Academy of Scientific and Innovative Research (AcSIR) , Sector 19, Kamla Nehru Nagar , Ghaziabad , Uttar Pradesh-201002 , India.
Abstract:
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 Zn2+ 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 Zn2+ anchor in an aqueous rechargeable zinc ion battery. The charge-storage mechanism comprises of an efficient reversible interlayer interaction of Zn2+ 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.
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