Abstract
Flexible supercapacitors with high mechanical strength,excellent flexibility,and high performance are highly desired to meet the increasing demands of flexible electronics.However,the trade-off between mechanical and electrochemical properties remains challenging.In this context,an interface-engineered strategy approach was proposed to construct polylactic acid(PLA)/polyaniline(PANI)/MXene(PPM)film electrodes for flexible supercapacitor applications.In the PPM electrode,the porous PLA prepared from the nonsolvent-induced-phase-separation method served as an ideal flexible substrate,providing excel-lent flexibility and high mechanical strength,whereas PANI as the coupling agent,enhanced the interfa-cial strength between PLA and the electroactive MXene that was firmly anchored and deposited on PLA through a facile layer-by-layer dip coating method.The tensile strength at break,elongation at break,and toughness of PPM are 53.09 MPa,11.09％,and 4.12 MJ/m3,respectively,much higher than those of pure MXene(29.36 MPa,4.62％,and 0.75 MJ/m3).At an optimum mass loading density of 3 mg cm-2 for MXene,the fabricated PPM3 film electrode achieved a high specific capacitance of 290.8 F g-1 at a cur-rent density of 1 A g-1 in the three-electrode setup,approximately 1.5 times that of 190.8 F g-1 for pure MXene.Meanwhile,the symmetric all-solid-state supercapacitor based on PPM3 film electrodes delivers a high specific capacitance of 193.7 F g-1 at a current density of 0.25 A g-1,with a corresponding high energy density of 9.3 Wh kg-1at a power density of 291.3 W kg-1.The SC retains 86％of its original ca-pacitance even bent at 120° and also possesses an excellent fire-retardant ability,demonstrating its great potential for flexible and safe wearable electronics.
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