Roll-to-roll printed high voltage supercapattery in lead-contaminated aqueous electrolyte

This work investigated the potential application of roll-to-roll printed PEDOT:PSS on an ITO/PET substrate using Pb2+ containing 0.1 M NaCl aqueous solution for a supercapattery. The PEDOT:PSS/ITO/PET electrode achieved 2.2 mu Ah cm(-2) (46.5 mAh g(-1)) in 0.1 M NaCl and 10 mu Ah cm(-2) (216.8 mAh g(-1)) in 2 mM Pb2+/0.1 M NaCl at a current density of 0.2 mA cm(-2) (4.34 A g(-1)). The electrode also shows good cyclic performance that retains 63% of its initial capacitance after 1000 charge-discharge cycles. A device operating at a high voltage of 1.8 V was built using PEDOT:PSS/ITO/PET in aqueous electrolyte. The energy density of the symmetric PEDOT:PSS/ITO/PET device is 6.2 Wh kg(-1) in 0.1 M NaCl and is improved to 11 Wh kg(-1) in 3 mM Pb2+/0.1 M NaCl.