A Tetrakis(terpyridine) Ligand–Based Cobalt(II) Complex Nanosheet as a Stable Dual‐Ion Battery Cathode Material
Yurong Liu, Wenwen Deng, Zhengong Meng, Wai‐Yeung Wong
Abstract
Abstract Inspired by the flexibility of the bottom‐up approach in terms of selecting molecular components and thus tailoring functionalities, a terpyridine derivative (1,2,4,5‐tetrakis(4‐(2,2′:6′,2″‐terpyridyl)phenyl)benzene) (Tetra‐tpy) is synthesized and coordinated with Co(II) ion to self‐assemble into a nanosheet Co‐sheet by a facile interface‐assisted synthesis. The bis(terpyridine)‐Co(II) complex nanosheet formed not only shows good stability, but also features the layered structure and rich electrochemical activity inherited from the embedded Co(terpyridine) 2 motif. Thus, Co‐sheet can serve as a cathode material for a dual‐ion battery prototype, which exhibits a high utilization of redox‐active sites, good cycling stability, and rate capability, thus expanding the potential application of this kind of easily prepared metal‐complex nanosheets in the field of energy storage.