Preparation and electrochemical performances of core-shell microtubular PPy/CNT/MOF ternary composites with spherical Co-MOF as sacrificial template

Abstract

Here we developed PPy/CNT/MOF ternary composites with microtubular structure, which was triggered by both the disassembly of Co-MOF and the reassembly of phosphomolybdate acid (PMA) and the released ligand. As a result, the CNTs and polypyrroles (PPys) are intertwined and deposited on the surface of the composites, forming a core-shell structure. Among the ternary composites, the PM/CNT/MOF-2 electrode (PMA concertation of 5 mM) provides a specific capacitance of 650 F g−1 at 1 A g−1. The assembled flexible supercapacitor device delivered a high energy density of 68.9 μWh cm−2 (45.9 Wh kg−1) at power density of 800 μW cm−2 (800 W kg−1), a good long-term cyclic stability, and superior mechanical flexibility.