Flexible all-solid-state supercapacitors of polyaniline nanowire arrays deposited on MOFs decorated electrospun carbon nanofibers.

Porous carbons derived from metal-organic framework are promising materials for a number of energy and environmental related applications. To integrate the powder metal-organic framework derived carbon into feasible engineered materials, a facile strategy to fabricate integrated flexible film is developed by growth of metal organic framework nanoparticles on polyimide electrospun nanofibers following with calcination to fabricate freestanding porous carbon decorated carbon nanofiber membranes. Then vertically polyaniline nanowire arrays were uniformly deposited on the hierarchical porous carbon substrates by in situ polymerization. Thanks to the good distribution of MOFs derived porous carbon on carbon nanofibers and the compact configuration interwoven by conducting polymers, the designed hybrid electrode could directly used as freestanding electrode for supercapacitors, which displayed a high specific capacitance of 1268 F g-1. The assembled flexible solid-state supercapacitor based on the integrated electrodes demonstrated a high volumetric capacitance of 1973 mF cm-3 and a good capacitance retention of 84.9% after 10000 cycles, which could power a commercial light-emitting-diode (LED). This strategy may shed light on designing MOFs-based flexible materials for practical applications of supercapacitors and other electrochemical devices.