Polypyrrole@metal-organic framework (UIO-66)@cotton fabric electrodes for flexible supercapacitors
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Metal-organic frameworks (MOFs) are recently attracting more and more interests as supercapacitor electrode materials. However, their low conductivity largely thwarts their capacitance performance. Herein, fabric electrodes for flexible supercapacitors were successfully fabricated by depositing polypyrrole (PPy) nanotubes and Zr-based MOF (UiO-66) particles on cotton fabrics. The PPy nanotubes could serve as conductive connectors to bridge the UIO-66 particles due to their superior conductivity with one-dimensional structure. The conductivity of the PPy@UIO-66@cotton fabric electrode was increased to 14.29 S cm−1. A specific capacitance of 565 F g−1 at a current density of 0.8 mA cm−2 was obtained for the PPy@UIO-66@cotton fabric electrode. In addition, the proposed fabric electrode exhibited good cycling stability with capacitance retention of 90% after 500 charge–discharge cycles and excellent rate capability. This study confirmed the combination of MOFs and PPy nanotubes has great application prospect in fabric-based flexible supercapacitors.
KeywordsMetal-organic frameworks Polypyrrole Fabric electrodes Flexible supercapacitors
This work was supported by the Scientific Innovation Team Project of the Education Department of Hubei Province (No. T201507), Wuhan Science and Technology Bureau (No. 2016010101010016), the Natural Science Foundation of China (Nos. 51703170 and 21673167) and the National Key Research and Development Program of China (No. 2016YFA0101102).
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