INVESTIGADORES
MORENO Mario Sergio Jesus
artículos
Título:
Facetted platinum electrocatalysts for electrochemical energy converters
Autor/es:
S.G. RAMOS; M.S. MORENO; G.A. ANDREASEN; W.E. TRIACA
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2010 p. 5925 - 5929
ISSN:
0360-3199
Resumen:
The preparation and characterisation of Pt nanoparticles electrodeposited on carbonsubstrates by pulsating electrolysis are presented. The characterisation studies of metalelectrodeposits by using SEM, TEM, XRD and cyclic voltammetry revealed the presence offacetted Pt nanoparticles having a predominant (111) preferential crystal orientation. Theamount of electrodeposited Pt was determined by means of a spectrophotometric technique.An improvement in performance of the hydrogen/oxygen PEM fuel cell with (111)-type Pt nanoparticles incorporated in the cathode was observed, which was assigned to thedecrease of the blocking effect of the cathode electrode surface by intermediate peroxidespecies produced during the overall oxygen electroreduction process.