Keywords : conductive polymers

(FeCo/Ppy@C): Pt-free FeCo-Polypyrrole Nanocomposites Supported on Porous Carbon for Electrochemical Application

Francesca Fiorellino; Martina Pilloni; Andrea Ardu; Valentina Cabras; Stefano Columbu; Lisa Russo; Alessandra Scano; Guido Ennas

Advanced Materials Letters, 2019, Volume 10, Issue 4, Pages 253-258
DOI: 10.5185/amlett.2018.2203

The synthesis and characterization of pyrolyzed carbon-supported transition metal/nitrogen (M–Nx/C) material based on FeCo alloy and Polypirrol as source of N atoms are presented. Two different synthetic protocols, a multi-step and a novel one pot single-step approach are compared. In both approaches two different Fe:Co ratio (50:50 and 75:25) were used to obtain Pt-free FeCo-Polypyrrole nanocomposites supported on porous carbon (FeCo/Ppy@C). Structural and morphological characterizations of the samples before and after pyrolysis were carried out by using X-Ray Powder Diffracion, Infrared Spectroscopy and High-Resolution Transmission Electron Microscopy. For both approaches, nanoparticles with a core shell structure but different size and matrix polidispersivity were observed after pyrolysis when a Fe:Co 50:50 ratio was used. Bigger nanoparticles were obtained after pyrolysis in the 75:25 ratio samples, with no significant differences between the two approaches. The electrocatalytical properties of the final samples, investigated by cyclic voltammetry in an acidic electrolyte, showed the presence of a cathodic current density.

PRAP-CVD: Up-scalable process for the deposition of PEDOT thin films

Bianca Rita Pistillo; Kevin Menguelti; Didier Arl; Renauld Leturcq; Damien Lenoble

Advanced Materials Letters, 2019, Volume 10, Issue 3, Pages 201-205
DOI: 10.5185/amlett.2019.2186

Plasma radicals assisted polymerization via CVD (PRAP-CVD) is emerging as an efficient alternative to conventional vapour based techniques to synthesise and deposit conjugated polymers. PRAP-CVD process is based on the concomitant but physically separated injection of low-energy oxidative radical initiators and vaporized monomer species into a reactor where temperature and pressure are finely controlled. Gas phase oxidative radicals are generated by a remote plasma chamber from a pure or diluted initiator. The low deposition temperature, below 100 °C, allows polymers to be directly synthesised on a wide range of substrates, including fabric, paper and plastic, without any thermal degradation and keeping a high degree of surface conformality. Additionally, the PRAP-CVD does not require post-deposition rinsing procedure which allows a wider range of application. PRAP-CVD PEDOT depositions have been carried out on different substrates with a transparency higher than 80% in the visible range.