Cover Page April-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 4, Article ID 253-258, April 2019
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The cover photo describes the ring topological structure of carbon nucleus (using vortex-fractal-ring theory), which consists from two globules with 3 protons globule substructures. As discussed by, this vortex-fractal-ring theory is a new and original view of elementary particles and the structure of atomic nuclei, atoms, and molecules. Its basics are simple for understanding through the comprehensive topological structure that does not need description by complicated mathematical formulas. This theory together with grammatical evolution can design new models of nanostructures and allows us to understand the fundamental physical and chemical reasons for the stability and reactivity of atoms and molecules.


(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*

Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato (CA), Italy

Adv. Mater. Lett., 2019, 10 (4), pp 253-258

DOI: 10.5185/amlett.2018.2203

Publication Date (Web): Oct 26, 2018

E-mail: alescano80@tiscali.it, ennas@unica.it

Abstract


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.

Keywords

Proton electrolyte membrane fuel cell, non-precious metal catalysts, oxygen reduction reaction (ORR), Pt-free electrocatalysts, conductive polymers, catalytic hydrogen production.

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