Cover Page April-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 4, Pages 253-258, April 2019
About Cover

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.

Current Issue

9th Anniversary of Advanced Materials Letters: Progress and Opportunities


Coating - A potent method to enhance electrochemical performance of Li(NixMnyCoz)O2 cathodes for Li-ion batteries


Analysis of machined electron beam treated Ti6Al4V-ELI implant surfaces


Bottom-up design of hydrogels through click-chemistry modification of magnetic nanoparticles


Visualization of mechanical loads with semiconductor nanocrystals 


Room temperature growth of ultra porous hot-wire deposited tantalum pentoxide


Substrate integrated circular cavity resonator filled with nano-fibrillated cellulose for humidity detection


Oxygen vacancy filament-based resistive switching in Hf0.5Zr0.5O2 thin films for non-volatile memory


Innovative silicon compatible materials for light emitting devices  


Graphene micromesh for transparent conductive films application 


Applications of nano-scale Cirrus DopantTM to improve existing coatings


Chitin nanofibrils in renewable materials for packaging and personal care applications


Synthesis of AgNPs embedded double network nanocomposite hydrogels having high swelling and anti-bacterial characteristics


Previous issues

Artificial intelligence and machine learning empowering the mass medicine

Piezo-therapy in cancer: Current research and perspectives

Magnetic microwires for sensor applications

A fundamental study on the mechanistic impact of repeated de- and rehydration of Ca(OH)2 on thermochemical cycling in technical scale

Fabrication and characterization of nano-bridge Josephson junction based on Fe0.94Te0.45Se0.55 thin film

Riboflavin-UVA gelatin crosslinking: Design of a biocompatible and thermo-responsive biomaterial with enhanced mechanical properties for tissue engineering

Broadband and fast photodetectors based on multilayer p-MoTe2/n-WS2 heterojunction with graphene electrodes

Ionic liquid [BMIM][Cl] immobilized on cellulose fibers from pineapple leaves for desulphurization of fuels

Synthesis and role of co-dopants (alkaline earth divalents and halides) on the photoluminescence of Eu2+ doped BaAl2O4 phosphor

Metal oxide (V2O5) incorporated fly ash based geopolymer for better sustainable engineering composites

Highly efficient storage of solar gains using aluminum foam heat exchangers  

Green fabrication of zinc oxide nanospheres by aspidopterys cordata for effective antioxidant and antibacterial activity

Effect of diamantane on the thermal stability of cryomilled aluminum alloy

Upcoming Congress

Knowledge Experience at Sea TM