Electrochemical Effects of Depositing Iridium Oxide Nanoparticles onto Conductive Woven and Nonwoven Flexible Substrates

This Article reports methods to deposit iridium oxide nanoparticles (IrOx NPs) onto flexible materials for charge storage and the stable charge–discharge mechanism. In this work, IrOx NPs were electrodeposited onto commercially available flexible surfaces of both knit and nonwoven cotton and nonwoven carbon-based (carbon nanotubes and graphene) textile substrates. Carbon-coated cotton materials were fabricated by reducing graphene oxide on fabric. Flexible electrode materials were fabricated by either reducing graphene oxide on cotton fabric or binding carbon nanotubes/graphene into a free-standing platform. The IrOx NPs were then electrodeposited onto flexible platform samples by applying a positive potential to the fabric. After deposition, the resultant specific capacitance of the materials increased within the range from 192% to 2747% and was stable for over 1000 charge and discharge cycles.