One-Dimensional 2r-d Conjugated Conductive Metal-Organic Framework with Dual Redox-Active Sites for High-Capacity and Durable Cathodes for Aqueous Zinc Batteries
ACS nano(2023)
摘要
advantages in terms of high safety, low cost, and environmental friendliness. However, the lack of suitable cathodes with highcapacity, long-cycling, and high-rate capability limits their practical application. Herein, we present a highly crystalline onedimensional 2r-d conjugated conductive metal-organic framework by coordinating ultrasmall 1,2,4,5-benzenetetramine (BTA) linkers with copper ions (Cu-BTA-H), as a cathode for ZIBs. The large ratio of active sites and dual redox mechanism of Cu-BTA-H, including the one-electron-redox reaction over copper ions (via Cu2+/Cu+) and the two-electron-redox reaction over organic ligands (via C=N/C-N), effectively enhance its reversible capacity. Meanwhile, the abundant porosity, small band gap, high crystallinity, and stable coordination structure of CuBTA-H endow it with fast ion/electron transport and effectively hinder the dissolution of organic ligands during cycling, respectively. Consequently, Cu-BTA-H possesses a high reversible capacity of 330 mAh g-1 at 200 mA g-1 and excellent rate performance and long-cycle stability, with a high capacity of 106.1 mAh g-1 at 2.0 A g-1 after 500 cycles and a high Coulombic efficiency of similar to 100%. The proposed conductive MOFs with dual redox-active sites provide an efficient approach for constructing fast, stable, and high-capacity energy storage devices. KEYWORDS: pi-d conjugated metal-organic framework, stable coordination structure, electron/ion transport, dual redox-active sites,
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关键词
?-d conjugated metal-organic framework,stable coordination structure,electron,ion transport,dual redox-active sites,aqueous Zn-based batteries
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