High-performance and Freestanding Cellulose Nanofiber@Metal-organic Frameworks (UIO-66)@PANI Composite Membranes for Flexible All-solid-state Supercapacitors
UIO-66 nanolayers were grown in situ on the surface of flexible CNFs by solvothermal reaction,then polyaniline (PANI) was deposited on the surface of CNFs@UIO-66 by in-situ polymerization.The flexible films were obtained by filtration and assembled into flexible solid-state supercapacitors.The effects of CNFs/UIO-66 ratio and ANI concentration on the electrochemical properties of CNFs@UIO-66@PANI composite membrane were investigated.The results show that the ratio of CNFs to UIO-66 has a critical effect on the electrochemical performances of the composite membrane.The specific capacitance of the composite membrane decreases from 1287 F·g-1 to 554 F·g-1 when the CNF/UIO-66 ratio decreases from 1∶1 to 1︰3 at a current density of 1 A·g-1.Furthermore,at 200 W·kg-1 power density and 47.39 Wh·kg-1 energy density,the assembled supercapacitor shows extremely high cycle stability with capacitance retentions of 100％ after 5000 continuous charge-discharge cycles.This study provides a pathway to develop CNFs@UIO-66@PANI based flexible energy storage devices.
Cellulose nanofibersUIO-66PolyanilineSolid state supercapacitors
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