A Two‐Dimensional Porphyrin Coordination Supramolecular Network Cathode for High‐Performance Aqueous Dual‐Ion Battery
Yuanming Tan, Zhao Chen, Zengren Tao, Anding Wang, Shimei Lai, Yangyi Yang
Abstract
Abstract Iodine has great potential in the energy storage, but high solubility of I 3 − has seriously delayed its promotion. Benefited from abundant active sites and the open channel, two‐dimensional coordination supramolecular networks (2D CSNs) is considered to be a candidate for the energy storage. Herein, a 2D porphyrin‐CSN cathode named Zn‐TCPP for aqueous iodine dual‐ion battery (DIB) shows an excellent specific capacity of 278 mAh g −1 , and a high energy density of 340 Wh kg −1 at 5 A g −1 , as well as a durable cycle performance of 5000 cycles and a high Coulombic efficiency of 98 %. Molecular orbital theory, UV/VIS, Raman spectroscopy and density functional theory (DFT) calculations reveal charge‐transfer interaction between the donor of porphyrin nitrogen and the acceptor of I 3 − , and computational fluid dynamics (CFD) simulations demonstrate the contribution of 2D layered network structure of Zn‐TCPP to the penetration of I 3 − .