Platinum electrocatalyst for electrodic reaction in fuel cell systems

RAMOS, SILVINA GABRIELA; ANDREASEN GUSTAVO; ARES ALICIA ESTHER; TRIACA WALTER

Encuentro; EuroNanoForum 2021; 2021

Platinum is an effective electrocatalyst for electrodic reactions involved in hydrogen/oxygen proton exchange membrane (PEM) fuel cell systems, particularly the oxygen electroreduction reaction. This reaction represents one of the main limitations in energy conversión systems, such as hydrogen/oxygen fuel cells, due to its slow electrode kinetics. In this work, the preparation and characterization of high surface area carbon-supported facetted platinum electrocatalysts with a defined and well characterised morphology for using in PEM fuel cells is presented. High surface area facetted platinum on carbon substrates are obtained by applying a square wave potential pulse of high frequency in aqueous chloroplatinic acid at 25 °C, between lower and upper potential limits of -0,2 V and 1,2 V, respectively. The characterization studies revealed the presence of highly facetted Pt nanoparticles having a predominant (111) preferential crystal orientation, which have shown a greater catalytic activity for the oxygen electroreduction reaction than that corresponding to polycrystalline Pt nanoparticles.