Flexible and heteroatoms-doped (N, O and P) activated carbon nanofiber networks \n(ACFNs) have been successfully prepared with a mixture of polyamic acid (PAA) and \npoly(diaryloxyphosphazene) (PDPP) as a solution through electrospinning, followed by a heat post-\ntreatment. The resultant heteroatoms-doped ACFNs can be used as binder-free electrodes for high-\nperformance flexible supercapacitors (SCs) due to lightweight, three-dimensional open-pore \nstructure and good mechanical strength. Despite its surface area being lower than 130.6 m2.g^-1, the \nheteroatoms-doped ACFNs exhibited a high heteroatoms (N, O and P) content of 17.9%, resulting \nin a highly specific capacitance of 182 F.g^-1 at a current density of 1 A.g^-1 in 6 M KOH electrolyte in \na two-electrode cell and an excellent rate capability of 74.7% of its initial capacitance from 1 A.g^-1 to \n10 A.g^-1 under the mass loading of 1.5 mg.cm^-2. The electrical double-layer (EDL) capacitance and \npseudocapacitance can be easily decoupled in the heteroatoms-doped mesoporous ACFNs. SCs \ndevice based on heteroatoms-doped ACFNs exhibited a high energy density of 6.3 W.h.kg^-1 with a \npower density of 250 W.kg^-1, as well as excellent cycling stability with 88% capacitance retention \nafter 10,000 charge-discharge cycles. The excellent electrochemical performance was attributed to \nthe mesoporous structure of ACFNs and pseudocapacitive heteroatoms.
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