4.6 Article

Methanol, Ethanol, and Formic Acid Oxidation on New Platinum-Containing Catalysts

Journal

CATALYSTS
Volume 11, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/catal11020158

Keywords

electrooxidation; formic acid oxidation; platinum-contained electrocatalyst; catalytic activity; alcohols oxidation

Funding

  1. Ministry of Science and Higher Education of the Russian Federation [0852-2020-0019]

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Pt/(SnO2/C) catalyst is the most active among the studied catalysts in methanol and formic acid electrooxidation reactions; the nature of the reagent affects the rates of corresponding reactions; Cu atoms and SnO2 nanoparticles positively influence the catalytic activity of platinum.
Electrooxidation of methanol, ethanol, and formic acid was studied on three platinum-containing electrocatalysts: PtCu/C, Pt/(SnO2/C), and Pt/C, Pt content being about 20 wt%. In all reactions, the integral specific activity of the catalysts, estimated from the results of cyclic voltammetry, grows in the Pt/C < Pt/(SnO2/C) < PtCu/C row. The influence of the reagent nature subjected to electrooxidation is manifested both in the difference of the absolute rate values of the corresponding reactions, decreasing in the order CH3OH > HCOOH > C2H5OH, and in the different ratio of these rates on different catalysts and at different potentials. Pt/(SnO2/C) catalyst containing SnO2 nanoparticles is the most active among the studied catalysts in methanol and formic acid electrooxidation reactions under potentiostatic conditions at the E = 0.60 V. Moreover, in formic acid electrooxidation reaction it is significantly superior to even the PtRu/C commercial catalyst. The reasons for the positive influence of Cu atoms and SnO2 nanoparticles on the catalytic activity of platinum are presumably associated with different effects: Interaction of the d-orbitals of copper and platinum atoms in bimetallic nanoparticles and implementation of the bifunctional catalysis mechanism on the adjacent platinum and tin dioxide nanoparticles.

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