One-pot two-step synthesis of micro- and mesoporous organic fibrils for efficient pseudocapacitors

Abstract

Porous organic polymers (POPs) have emerged as promising materials for electrochemical devices on account of their diverse functional groups and morphologies. Herein, we describe a one-pot two-step synthesis of redox-active and permeable POPs as uniformly shaped fibrils with homogeneous micropores and hierarchical mesoporous channels. Owing to the high fraction of redox-active groups and porous structure, the active material (PI-Fiber) exhibited a high charge capacity of 83.3 mA h g⁻¹ over 0.5 V even at a current density of 75 A g⁻¹, a coulombic efficiency of over 95%, and stability to endure nearly 10 000 cycles. Additionally, high energy and power densities were observed in a two-electrode cell, indicating that PI-Fiber can be adapted for pseudocapacitive energy storage systems. Therefore, our work illustrates that a novel molecular design, supramolecular assembly, and hierarchical architecture of POPs can aid the development of novel and versatile energy-storage materials.