Novel Conducting Polymer Cathode Materials For Bioelectric Batteries

A bioelectric battery provides a promising alternative to commercial lithium batteries to drive active implantable medical devices(AIMD)due to its ease of miniaturization.Conducting polymers(CPs)show electrocatalytic activity and biocompatibility in previous studies,satisfying the requirements for their use in bioelectric batteries.Furthermore,the low cost compared to noble metals(like Pt)makes them promising cathode materials.However,the CPs always need some dopants such as graphene,anthraquinone and nitroxide radicals etc.to improve its performance.Herein,the application of CPs and biocompatibility dopants in bioelectric batteries was intensively studied in this thesis.To improve the electrical conductivity and battery performance of the composite,AQS and r-GO were co-incorporated into PPy via electro-polymerization following electro-reduction process.At current density of 25 ?A cm-2,the co-doped PPy delivered a voltage of 1.40 V,higher than that of PPy/r-GO.Furthermore,even the PPy was reducted,the PPy/AQS/RGO still exhibited a acceptable electrochemical performance compared to that of PPy doped with AQS or r-GO.In order to improve the electrocatalytic activity and power destiny of the composite,we choose the Poly(3,4-ethylenedioxythiophene)(PEDOT)as the matix fabricated the PEDOT/AQS/RGO,and tried to find the best proportion of RGO and AQS.The results showed that the concentration of AQS was 0.002 mol/L and of RGO was 0.75 mg/mL,the materials elivered a maximum power density of 13470 mW m-2,much higher than that of PEDOT/AQS or PEDOT/r-GO.PTMA is another promising electrode material in bioelectric batteries because of its biocompatibility and electrocatalysis towards oxygen reduction.In this work,PPy/PTMA composites were successfully synthesized with the use of a chemistry method.The PPy/PTMA composites exhibited a superior Cycling performance to pure PPy in bioelectric batteries,due to it affording easier access of ion and oxygen transportation through the PTMA.Furthermore,PTMA could serve as a biocompatible and conductive substrate for the electro-polymerization of PPy instead of a metal substrate,which is expected to improve the biocompatibility of the whole electrode.