Abstract
In this work, we demonstrate the fabrication of ultrathin printable supercapacitors (UPSCs) with AC line-filtering performance based on graphene-conducting polymer (EG/PH1000) hybrid fi lms. The conductive hybrid ink of electrochemically exfoliated graphene (EG) and poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) (Clevios PH1000) was spray coated on a gold-deposited 2.5-μm-thick PET substrate with a tunable thickness ranging from nanometers to micrometers. Thus, the UPSCs were constructed with two EG/PH1000 hybrid films sandwiching a thin polymer gel electrolyte of poly(vinyl alcohol)/H2SO4 (PVA/ H2SO4) and exhibited an unprecedented volumetric capacitance of 348 F cm −3 and excellent cycling stability with no capacitance loss after  50000 cycles. Such UPSCs could be operated at an ultrahigh rate of up to 2000 V s −1 . More importantly, our devices delivered an AC line-filtering performance with an extremely short RC time constant of<0 .5 ms.