RICARDO MARCELO PIASENTIN
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Artigo IPEN-doc 27245 Comparison of various atomic compositions of Au@Pd/C, Pd/C, and AuPd/C electrocatalysts for direct ethanol fuel cells2020 - FONTES, ERIC H.; NANDENHA, JULIO; PIASENTIN, RICARDO M.; SOUZA, RODRIGO F.B. de; NETO, ALMIR O.Pd/C, Au@Pd/C (core-shell), and AuPd/C (AR—consisting in Au microparticles) were used as electrocatalysts for ethanol oxidation in alkaline medium. A synergistic effect between Au and Pd atoms in Au@Pd/C makes the binding between ethanol and Au@Pd/C stronger. This leads to product formation in higher potentials and can be useful to select ethanol products. We also showed that the atomic composition of the electrocatalysts to be used in fuel cells and in powder form to be used in electrochemical experiments are very similar, reaching high values of correlation. The depth profiling X-ray photoelectron spectroscopy for the anode catalysts to be used in fuel cells can provide new insights about ethanol oxidation in direct ethanol fuel cells (DEFCs), for instance, metal oxide species can act in fuel cells environment. In terms of electric generation, Au@Pd/C presented a better performance in electrochemical experiments; the current density was about 1.6 times higher than the peak current density obtained for Pd/C. In terms of electrochemical stability, Au@Pd/C presented better final current density when compared to Pd/C and AuPd/C electrocatalysts. However, in DEFC experiments, Pd/C showed better performance.Artigo IPEN-doc 26482 Partial oxidation of methane and generation of electricity using a PEMFC2019 - NANDENHA, J.; PIASENTIN, R.M.; SILVA, L.G.M.; FONTES, E.H.; NETO, A.O.; SOUZA, R.F.B. deThe aim of this work was to produce methanol through partial oxidation of methane. The gas fed in a solid membrane reactor- PEM fuel cell type (H2/H2O2 + CH4) has been used for electrosynthesis of methanol at room temperature, with electricity cogeneration as a benefit. It was observed that the current density measured when injected CH4 in the cathode decreased about 45%. This occurs due to the conversion of methane inmethanol in some ranges of potentials. In the other hand, in lower ranges of cell potential, formaldehyde was found. In this work, methane was injected on the cathode together with H2O2 solution, where it was observed that the catalytic layer adsorbed CH4 and H2O2 in active sites, which produced OH− radicals that reacted with the hydrocarbon.Artigo IPEN-doc 18325 Ethanol electro-oxidation on PtSn/C-ATO electrocatalysts2012 - AYOUB, J.M.S.; SOUZA, R.F.B. de; SILVA, J.C.M.; PIASENTIN, R.M.; SPINACE, E.V.; SANTOS, M.C.; OLIVEIRA NETO, A.Artigo IPEN-doc 17734 Preparation of Pt/C-Insub(2)Osub(3).SnOsub(2) electrocatalysts by borohydride reduction process for ethanol electro-oxidation2012 - HENRIQUE, R.S.; SOUZA, R.F.B. de; SILVA, J.C.M.; AYOUB, J.M.S.; PIASENTIN, R.M.; LINARDI, M.; SPINACE, E.V.; SANTOS, M.C.; NETO, A.O.