Abstract
The absence of unpaired d-electrons of gold leads to its lack of reactivity and paucity of catalytic activity. Synergistic activity of bimetallic PtAu has been proved, and its structure greatly influences on the electrocatalytic activity toward formic acid and carbon monoxide oxidation. Here, a comparison between Pt-modified Au (designated as Pt-on-Au) and PtAu alloy catalysts has been studied. The Pt-on-Au catalyst was prepared by electrodeposition of Pt on the pre-prepared Au, while PtAu alloy was obtained by co-electrodeposition. As a whole, both types of PtAu catalysts were found to be more active toward formic acid electrooxidation compared to pure Pt, exhibiting maximum activity on Pt-on-Au catalyst with Pt to Au atomic ratio of 1:10.22. Moreover, the Pt/Au atomic ratio directly relates to the oxidation pathway of formic acid and carbon monoxide oxidation. The results may be ascribed to much less COads on the surface than single Pt catalyst due to the effect of Au nanoparticles. CO stripping voltammograms present the obvious variation between Pt-on-Au and PtAu alloy catalysts. Meanwhile, the electrocatalytic activities of bimetallic PtAu are evaluated by electrochemical impedance spectroscopy and Tafel analysis.
Highlights
In order to solve the problems of air pollution, increasing energy demands, as well as limited fuel reserves caused byQ
W is the mass of deposited Pt or Au, η is current efficiency, Qdep is the total charge passed through the electrodes during the deposition process, M is the molecular weight, F is the Faraday constant (96,485 C mol−1), and Z is the number of electrons transferred
PtAu catalysts with various Pt/Au ratios obtained by electrodeposition of Pt precursor on preprepared Au nanoparticles (Pt-on-Au) and by simultaneous co-electrodeposition of Au and Pt (PtAu alloy) have been investigated as an anodic electrocatalyst toward formic acid and carbon monoxide oxidation
Summary
In order to solve the problems of air pollution, increasing energy demands, as well as limited fuel reserves caused byQ. Yang : In order to improve the catalytic performance of FA oxidation by dehydrogenation pathway, the development of bimetallic Pt–M (M = Au, Pd, Ru, Bi, etc.) catalysts has been recognized as one of the most effective strategies. The facts show that a Pt-based catalyst has improved the catalytic performance of FA oxidation compared with pure Pt [14,15,16,17,18,19]. The incorporation of Au into Pt could lead to the segregation of Pt sites and further reduce the number of adsorption sites for CO, thereby yielding an improvement in the activity of FA oxidation [13, 20, 27]
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