Carbon-supported Pd100-XAuX alloy nanoparticles for the electrocatalytic oxidation of formic acid: Influence of metal particles composition on activity enhancement

Szumełda, T.; Drelinkiewicz, A.; Lalik, E.; Kosydar, Robert; Duraczyńska, Dorota; Gurgul, Jacek

doi:10.1016/j.apcatb.2017.09.039

Cited by 37 publications

(19 citation statements)

References 73 publications

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“…19,73 Optimum electronic properties have been frequently invoked to explain a catalytic activity maximum observed for the electrochemical oxidation of formic acid on PdAu materials with different Au contents. 74,75 The results reported here show that the formation of adsorbed oxygenated species, often considered to inhibit formic acid oxidation by blocking adsorption sites but necessary to remove CO, is not independent of the electronic properties. Thus, combined ligand effects with different coverages of adsorbed oxygen-containing species is a more likely explanation of that kind of results.…”

Section: Methodsmentioning

confidence: 77%

What Determines Electrochemical Surface Processes on Carbon-Supported PdAu Nanoparticles?

2018

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Supported bimetallic nanoparticles have good activities in heterogeneous catalysis and electrocatalysts. Among those systems, PdAu shows improved stability and enhanced catalytic activity towards electrochemical reactions such as oxygen reduction, formic acid oxidation and hydrogen evolution. The aim of this work was to study comprehensively the influence of ligand and ensemble effects on surface processes, such as oxide formation/reduction, oxidation of adsorbed CO and adsorption of hydrogen, taking place on carbon-supported PdAu nanoparticles of different compositions. Towards that end, we thoroughly characterized the properties of PdAu/C catalysts with nominal Au contents of 20 to 50 % (in atoms) prepared by the same procedure and having similar average particle diameters. The combination of results obtained by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicates that nanoparticles had Pd-enriched surfaces and Au-rich interior. X-ray absorption spectroscopy (XAS) measurements around the Pd L3 edge evidenced that Au promotes an increase in the electronic occupation of the Pd 4d band, consistent with XPS results showing varying amounts of surface-like and bulk-like Pd oxide and 2 metallic Pd. We show herein that ligand effects determine the formation of a Pd oxide layer on PdAu/C catalysts and ensemble effects govern hydrogen and CO adsorption. CO oxidation is delayed as the Au content increases as result of the decreasing availability of oxygen-containing species.

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Section: Methodsmentioning

confidence: 77%

What Determines Electrochemical Surface Processes on Carbon-Supported PdAu Nanoparticles?

2018

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“…These electrons can subsequently move to the cerium oxide support, further enhancing the reducibility/mobility of the CeO 2 oxygen. As reported in the literature, indeed, the modification of the electron properties of the other metal is a typical feature of the gold-based bimetallic systems, due to the high electronegativity of gold, [69,70].…”

Section: Discussionmentioning

confidence: 58%

High-Performing Au-Ag Bimetallic Catalysts Supported on Macro-Mesoporous CeO2 for Preferential Oxidation of CO in H2-Rich Gases

et al. 2020

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We report here an investigation on the preferential oxidation of carbon monoxide in an H2-rich stream (CO-PROX reaction) over mono and bimetallic Au-Ag samples supported on macro-mesoporous CeO2. The highly porous structure of ceria and the synergistic effect, which occurs between the bimetallic Au-Ag system and the support, led to promising catalytic performance at low temperature (CO2 yield of 88% and CO2 selectivity of 100% at 60 °C), which is suitable for a possible application in the polymer electrolyte membrane fuel cell (PEMFC). The morphological, structural, textural and surface features of the catalysts were determined by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), N2-adsoprtion-desorption measurements, Temperature Programmed Reduction in hydrogen (H2-TPR), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). Furthermore, the catalytic stability of the best active catalyst, i.e., the AuAg/CeO2 sample, was evaluated also in the presence of water vapor and carbon dioxide in the gas stream. The excellent performances of the bimetallic sample, favored by the peculiar porosity of the macro-mesoporous CeO2, are promising for possible scale-up applications in the H2 purification for PEM fuel cells.

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“…e essence of this overcoming lies in modulating the Pt-CO binding to mitigate the adsorption of CO on the Pt surface and enriching the Pt surface with oxygen containing moieties that facilitates the oxidative removal of poisoning CO at a relatively low potential. Interestingly, the use of hybrid nanocatalysts of Pt with Pd, Au, Ru, Rh, Bi, Sn, Co, Cu, and Ni or with transition metal oxides such as NiOx, CoOx, MnOx, and Cu 2 O for FAO succeeded to provide a proof for this conception [24][25][26][27][28][29][30]. e current investigation suggests a low-priced and efficient FeOx/Pt nanocatalyst for FAO.…”

Section: Introductionmentioning

confidence: 85%

Bifunctional Tailoring of Platinum Surfaces with Earth Abundant Iron Oxide Nanowires for Boosted Formic Acid Electro-Oxidation

Al-Qodami

Farrag

Sayed

et al. 2018

Journal of Nanotechnology

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To expedite the marketing of direct formic acid fuel cells, a peerless inexpensive binary FeOx/Pt nanocatalyst was proposed for formic acid electro-oxidation (FAO). The roles of both catalytic ingredients (FeOx and Pt) were inspired by testing the catalytic performance of FAO at the FeOx/Au and FeOx/GC analogies. The deposition of FeOx proceeded electrochemically with a post‐activating step that identified the catalyst’s structure and performance. With a proper adaptation for the deposition and activation processes, the FeOx/Pt nanocatalyst succeeded to mitigate the typical CO poisoning that represents the principal element deteriorating the catalytic performance of the direct formic acid fuel cells. It also provided a higher (eightfold) catalytic efficiency than the bare Pt substrates toward FAO with a much better durability. Field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were all employed to inspect, respectively, the surface morphology, bulk composition, and crystal structure of the catalyst. The electrochemical impedance spectra could correlate the charge transfer resistances for FAO over the inspected set of catalysts to explore the role of FeOx in mediating the reaction mechanism.

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Carbon-supported Pd100-XAuX alloy nanoparticles for the electrocatalytic oxidation of formic acid: Influence of metal particles composition on activity enhancement

Cited by 37 publications

References 73 publications

What Determines Electrochemical Surface Processes on Carbon-Supported PdAu Nanoparticles?

What Determines Electrochemical Surface Processes on Carbon-Supported PdAu Nanoparticles?

High-Performing Au-Ag Bimetallic Catalysts Supported on Macro-Mesoporous CeO2 for Preferential Oxidation of CO in H2-Rich Gases

Bifunctional Tailoring of Platinum Surfaces with Earth Abundant Iron Oxide Nanowires for Boosted Formic Acid Electro-Oxidation

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