Synthesis and Characterization of Platinum-Cerium Oxide Nanocatalysts for Methanol Oxidation

Abstract

CeO 2 -C(Vulcan) catalyst materials activated with Pt nanoclusters have been synthesized using different methods comprising microwave synthesis, reduction with hydrogen and reduction with NaBH 4 . The materials have been analyzed using low temperature nitrogen adsorption, X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray spectroscopy methods. Methanol oxidation has been studied using cyclic voltammetry, chronoamperometry and impedance methods. Very noticeable influence of catalyst surface structure and porosity, depending on the complex catalyst preparation conditions, has been demonstrated. High electrochemically active surface area values have been calculated. High current densities of MeOH oxidation have been established for several catalysts. Fitting of the impedance data has been performed, and the results have been discussed.

Synthesis and Characterization of Platinum-Praseodymium Oxide Nanocatalysts for Methanol Electrooxidation

“…Most noticeable is the fact that all Pt-PrO x -C materials perform better than the Pt-CeO 2 -C material. 21 In case of the PrO x -C materials, the methanol oxidation activity as expressed by the current peak at E = 0.15 V, is higher for the materials calcined at higher temperatures. The material Pt-PrO x -C 300 exhibits only slightly higher activity than Pt-CeO 2 -C, however materials calcined at higher temperatures are noticeably more active, albeit with smaller differences between them.…”

“…Selected data are also shown in Table III. Data for a Pt-CeO 2 -C catalyst material are shown for comparison, the results for which have been adapted from our previous study, 21 along with a commercial Pt-C material. The shapes of the CVs for the Pt-RE materials are very similar.…”

“…15,16 CeO 2 has been studied most extensively of this group of materials. [15][16][17][18][19][20][21] In this study however, praseodymium oxide is studied as a continuation of our previous study based on Pt-CeO 2 catalysts. 21 Praseodymium oxide has also been used in solid oxide fuel cells due to its high oxygen conductivity at higher temperatures.…”

“…[15][16][17][18][19][20][21] In this study however, praseodymium oxide is studied as a continuation of our previous study based on Pt-CeO 2 catalysts. 21 Praseodymium oxide has also been used in solid oxide fuel cells due to its high oxygen conductivity at higher temperatures. 22 In ambient conditions praseodymium oxide exists as a mixed oxide Pr 6 O 11 .…”

Two-Step Solvent Extraction of Radioactive Elements and Rare Earths from Estonian Phosphorite Ore Using Nitrated Aliquat 336 and Bis(2-ethylhexyl) Phosphate

“…Rare earth elements (REE), REEs alloys, and compounds possess important magnetic, spectroscopic, and optical features, and therefore, REEs are applicable in many areas of modern technology [1][2][3]. For example, REE complex oxides and complex hydrides are important construction elements in energy storage devices and components, including Liion and Na-ion batteries, solid oxide fuel cells [4,5], high-temperature electrolyzers [6][7][8], cocatalysts in polymer membrane electrolyte fuel cells [9,10], and direct methanol oxidation fuel cells [11,12].…”