Influence of physicochemical characteristics of carbon supports on Pd ethanol oxidation catalysts

Elsheikh, Ahmed; Martins, Vitor L.; McGregor, James

doi:10.1016/j.egypro.2018.09.031

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…As commented above, Pd/CNF LS provided the lowest particle size and therefore the highest dispersion, more suitable textural properties (higher mesoporosity and adequate pore volume and size) and oxygen species, which resulted in the best electrocatalytic activity for the EOR, whereas Pd/CNF f‐LS and Pd/GF exhibited lower electrocatalytic activity owing to their lower dispersion (larger particle size) compared with the other anodic catalysts.…”

Section: Resultsmentioning

confidence: 94%

“…Hence the corresponding pore size (17.2 nm) slightly increased after metal deposition (16.7 nm in CNF LS). This is interesting, as the larger pore size of Pd/CNF LS may assure that there is more space surrounding the Pd nanoparticles to facilitate reactant/product mass transfer between the bulk solution and the electrode surface, which may contribute to higher electro‐oxidation activity of the catalyst …”

Section: Resultsmentioning

confidence: 99%

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Optimization of the catalytic support and membrane for the electrochemical reforming of ethanol in alkaline media

Calcerrada

Osa

Romero

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: In this work, the influence of the anodic catalyst carbonaceous support and the membrane on the electrochemical reforming of ethanol for hydrogen production in alkaline media has been studied. Physicochemical characterization and electrochemical activity measurements were performed for different palladium-based anodic catalysts. The best anodic catalyst was scaled up to two different membrane electrode assemblies (MEAs) based on anion exchange membranes (AEMs): Tokuyama and KOH-doped polybenzimidazole (PBI) membranes. In both systems, the influence of the temperature and the stability were evaluated for the electrochemical reforming of ethanol. RESULTS: Among the different investigated catalysts, palladium supported on non-functionalized low-surface nanofibers was the best anodic catalyst for the electrochemical reforming of ethanol in alkaline media, which was attributed to the specific physicochemical and textural properties of this material. In addition, the use of a Tokuyama membrane allowed to obtain the highest electrocatalytic activity in hydrogen production together with a suitable stability behavior. Under the optimized conditions, current density values up to 120 mA cm −2 at 1.4 V were obtained, leading to lower energy values for hydrogen production compared with those of water electrolysis in commercial alkaline electrolyzers. CONCLUSION: The choice of palladium supported on non-functionalized nanofibers as anodic catalyst and a Tokuyama membrane allows to obtain the best MEA configuration for the electrochemical reforming of ethanol for hydrogen production.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Optimization of the catalytic support and membrane for the electrochemical reforming of ethanol in alkaline media

Calcerrada

Osa

Romero

et al. 2019

J of Chemical Tech & Biotech

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show abstract

“…The intense broad peak at 23.72º shows that the synthesized Pd@AC composite has an amorphous characteristic with certain clearly defined sharp peaks originating from palladium. 28 29 The lattice parameter (αPd) values of the metal particles were obtained using the Pd (220) diffraction peak of the composite. The lattice constant value of dispersed Pd nanoclusters was calculated to be 3.886 Å using Eq 1.…”

Section: Characterization Of Palladium Resin Compositementioning

confidence: 99%

The electrochemical reduction of hydrogen peroxide on a palladium-amorphous carbon composite in an alkaline medium

Čović,

Mirčeski,

Zarubica

et al. 2023

Maced. J. Chem. Chem. Eng.

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The study of hydrogen peroxide reduction in an alkaline aqueous medium on a composite of palladium particles dispersed in an amorphous carbon matrix (Pd@AC) was performed. Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray Powder Diffraction (XRD) were used to examine morphology, composition, and crystalline structure. The crystalline structure and size of palladium were analyzed using XRD. The reduction of hydrogen peroxide was studied through cyclic and square-wave voltammetry in an alkaline solution in the absence and presence of dissolved oxygen. The overall electrocatalytic effect of Pd@AC toward hydrogen peroxide reduction strongly depends on the presence of oxygen and the hydrogen peroxide disproportionation reaction in the three-phase system of amorphous carbon, palladium particles, and electrolyte solution.

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“…To prepare the fuel cell catalyst, an inert and high surface-area support material is usually required to disperse the small metal nanoparticles and maximize the reaction area. Carbon materials such as vulcan carbon, carbon nanotubes, nanofibers, and graphene are the most common support materials that have been studied [16][17][18][19][20][21][22][23]. Furthermore, achieving lower metal loading and consumption and attaining dispersed metal species are other benefits of using a carbon support [24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Carbon-Supported PdIrNi Catalysts and Their Performance towards Ethanol Electrooxidation

2021

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Direct ethanol fuel cells (DEFCs) have shown a high potential to supply energy and contribute to saving the climate due to their bioethanol sustainability and carbon neutrality. Nonetheless, there is a consistent need to develop new catalyst electrodes that are active for the ethanol oxidation reaction (EOR). In this work, two C-supported PdIrNi catalysts, that have been reported only once, are prepared via a facile NaBH4 co-reduction route. Their physiochemical characterization (X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS)) results show alloyed PdIrNi nanoparticles that are well dispersed (<3 nm) and exist in metallic state that is air-stable apart from Ni and, slightly, Pd. Their electrocatalytic activity towards EOR was evaluated by means of cyclic voltammetry (CV) and chronoamperometry (CA). Even though the physiochemical characterization of PdIrNi/C and Pd4Ir2Ni1/C is promising, their EOR performance has proven them less active than their Pd/C counterpart. Although the oxidation current peak of Pd/C is 1.8 A/mgPd, it is only 0.48 A/mgPd for Pd4Ir2Ni1/C and 0.52 A/mgPd for PdIrNi/C. These results were obtained three times and are reproducible, but since they do not add up with the sound PdIrNi microstructure, more advanced and in situ EOR studies are necessary to better understand the poor EOR performance.

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Influence of physicochemical characteristics of carbon supports on Pd ethanol oxidation catalysts

Cited by 7 publications

References 10 publications

Optimization of the catalytic support and membrane for the electrochemical reforming of ethanol in alkaline media

Optimization of the catalytic support and membrane for the electrochemical reforming of ethanol in alkaline media

The electrochemical reduction of hydrogen peroxide on a palladium-amorphous carbon composite in an alkaline medium

Synthesis of Carbon-Supported PdIrNi Catalysts and Their Performance towards Ethanol Electrooxidation

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