A Comparative Study of the Catalytic Performance of Pt-Based Bi and Trimetallic Nanocatalysts Towards Methanol, Ethanol, Ethylene Glycol, and Glycerol Electro-Oxidation

American Scientific Publishers - Tập 20 Số 10 - Trang 6274-6285 - 2020
Hadla S. Ferreira1, Martin Gocyla2, Hadma Sousa Ferreira3, Rennan G.O. Araújo3, Caio V.S. Almeida1, Marc Heggen2, Rafal E. Dunin‐Borkowski2, Katlin I.B. Eguiluz1, Peter Strasser4, Giancarlo R. Salazar‐Banda1
1Laboratório de Eletroquímica e Nanotecnologia, Instituto de Tecnologia e Pesquisa, CEP: 49032-490, Aracaju-SE, Brazil
2Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
3Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, 40.290-170, Salvador, Brazil
4Department of Chemistry, Technical University Berlin, Straße des 17.Juni 124, 10623 Berlin, Germany

Tóm tắt

Carbon-supported platinum is used as an anode and cathode electrocatalyst in low-temperature fuel cells fueled with low-molecular-weight alcohols in fuel cells. The cost of Pt and its low activity towards the complete oxidation of these fuels are significant barriers to the widespread use of these types of fuel cells. Here, we report on the development of PtRhNi nanocatalysts supported on carbon made using a reduction chemistry method with different atomic rates. The catalytic activity of the developed catalysts towards the electro-oxidation of methanol, ethanol, ethylene glycol, and glycerol in acidic media was studied. The obtained catalysts performances were compared with both commercial Pt/C and binary Pt75Ni25/C catalyst. The nanostructures were characterized, employing inductively coupled plasma optical emission spectrometer, X-ray diffraction, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The binary catalyst presents a mean particle size of around 2 nm. Whereas the ternary catalysts present particles of similar size and with some large alloy and core–shell structures. The alcohol oxidation onset potential and the current density measured after 3600 s of chronoamperometry were used to classify the catalytic activity of the catalysts towards the oxidation of methanol, ethanol, ethylene glycol, and glycerol. The best PtRhNi/C catalyst composition (i.e., Pt43Rh43Ni14/C) presented the highest activity for alcohols oxidation compared with all catalysts studied, indicating the proper tuning composition influence in the catalytic activity. The enhanced activity of Pt43Rh43Ni14/C can be attributed to the synergic effect of trimetallic compounds, Pt, Ni, and Rh.

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American Scientific Publishers

Tập 20 Số 10

6274-6285

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