Development of new metalloporphyrin based organic polymers with application in supercapacitors devices.

RAÚL RUBIO; TANIA CONDORI; CAROLINA CODONI; M. EUGENIA PÉREZ; BELÉN SUÁREZ RAMANZIN; EDGARDO N. DURANTINI; LUIS OTERO; MIGUEL GERVALDO; JAVIER E. DURANTINI

Simposio; VIII Symposium on Hydrogen, Fuel Cells and Advanced Batteries; 2022

Nowadays, one of the biggest challenges of modern societies is the increasing energetic demand since there is a great dependence on fossil fuels and these represent a threat to our ecosystem. Renewable energy sources, such as solar radiation, are alternatives o supplant fossil fuels. However, because of the variability in time as well as geographic distribution, devices to store the generated energy are needed. In this sense, batteries and supercapacitors have garnered a lot of interest in recent years. [1] Supercapacitors (SC) are a promising alternative because they allow a quick charge/discharge, life cycle and power densities superior to other devices as batteries. There are two types of supercapacitors: electrostatic dou‐ble layer (EDLC) and pseudocapacitors (PSC). PSC stores energy by faradaic reversible redox processes (oxidation‐reduction) that occur within the electrode material, being this phenomenon known as pseudocapacitance. [2,3] Until now metal oxides, metal hydroxides and organic polymers have been used in PSC. [4] Porous conductive polymers (PCP) are materials of interest due to their open structure, high specific energy and power, high conductivities and are flexible. A strategy that can be used in the deposition of organic polymers is the electropolymerization. The polymerization through electrochemical deposition techniques allows synthesising the polymeric film in one step with fine control over the thickness. [5] A number of reports revealed that the polymeric films obtained electrochemically over conductive solid substrates are highly stable, showing compact layers, with excellent stuck to the electrode and high charge transport capability. [4,6] In this work we present the electrochemical formation and characterization of porphyrin films obtained by electrochemical polymerization. Porphyrin monomers contain two carbazoles (CBZ) and two triphenylamine (TPA) residues in their peripheries. Fig. 1 shows the chemical structure of the studied molecules. The electrogenerated polymers possess electronic properties that make the material suitable for application in electrochromic and energy storage devices. The presence of numerous reversible redox centres in porous electrode materials is essential for the occurrence of pseudocapacitive processes.