Dataset for the synthesis of highly stabilized Pt-Pd-Co catalysts to improve electroactivity on methanol oxidation reaction in alkaline media: XPS, EIS and SEM/EDS characterization

Description

This document contains additional information on the characterization of ternary PtPdCo/C catalysts that were synthesized in different proportions by the colloidal method by displacement of organometallic ligands using octylamine as a stabilizer, which were prepared to improve the properties of electrode materials during the oxidation reaction of Methanol in direct alcohol fuel cells. These data will provide complete specific information of the X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) characterization. Specifically, it is shown the fitting of each element, determination of their chemical composition of forming the ternary alloy and the surface state. It also provides information on the electrochemical impedance spectroscopy (EIS) technique that complements the data previously provided, using Bode plots; finally, it provides mapping with semiquantitative analyses of the elements forming the alloy in the catalysts. The data provided in this document could be useful for researchers that developed electrode materials with low amounts of noble metals to be used in polymer electrolyte membranes fuel cells.

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This study proposed the used of high amounts of cobalt, as transition metal, during the synthesis of ternary catalysts (PtPdCo) to be used in the methanol oxidation reaction in alkaline medium. The synthesis was carried out from reduction and displacement of organometallic ligands technique in the presence of octylamine (2 equiv.). The preliminary hypothesis is that with this method it is possible to obtain a good particle size, dispersion and shape, contributing to better tolerance to CO poisoning and at the same time reducing the number of noble metals. As is known, global energy demand continues to increase, and new materials are required that have high electroactivity but at the same time have economical production and a long half-life during charging and discharging processes. The proposed theoretical compositions were Pt70Pd10Co20, Pd70Pt10Co20, Co70Pt20Pd10 and Co70Pt10Pd20. The determination of the composition is quite important because the electroactivity of the electrode materials depends on it; in particular, the XPS analysis of these electrode materials, SEM/EDS measurements and the complement of the electrochemical performance are presented in detail.

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