Electrocatalysis in Fuel Cells

Sandstede,

doi:10.1007/978-1-4471-4911-8

Cited by 86 publications

(10 citation statements)

References 15 publications

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“…A similar phenomenon was observed by another group working on carbon nanofibers decorated with Pt nanoparticles . It has been noted that Pt nanoparticles favor attachment almost exclusively to the defect or edge sites of nonmodified carbons, and this could explain how the support’s crystal structure gets more ordered after Pt loading (which might be the reason why a sharper and narrower G band is detected in the case of Pt/CO 2 -C). Accordingly, the disordered nature of CO 2 -C is considered to be an asset for homogeneous Pt dispersion, leading to higher catalytic activity.…”

Section: Resultssupporting

confidence: 77%

Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Najafli

Ratso

Ivanov

et al. 2023

ACS Appl. Nano Mater.

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While fuel cells have the potential to be among the key players in clean energy production, they are challenged by the sluggish electrochemical reactions that require an expensive and scarce platinum (Pt) catalyst. Commercial Pt-based catalysts used for facilitating the hydrogen oxidation reaction and oxygen reduction reaction (ORR) in fuel cells are commonly supported by petroleum-sourced carbon materials such as Vulcan XC-72. Thus, the replacement of such support materials with sustainable alternatives while enhancing the catalyst activity is highly desirable. For the first time, a Pt catalyst supported with a sustainably manufactured nanoscale CO2-derived carbon (Pt/CO2-C) was synthesized in this work. Physical and electrochemical characterization of the catalyst revealed the superior activity of Pt/CO2-C toward the ORR in comparison to commercial Pt/C with higher onset potential, mass activity, and specific activity values. Via further improvement, the prepared catalyst material is deemed to be a promising candidate for cheaper and more sustainable fuel cells.

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Section: Resultssupporting

confidence: 77%

Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Najafli

Ratso

Ivanov

et al. 2023

ACS Appl. Nano Mater.

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“…The latter are either hosted in a micropore, bridging the zig-zag sides of two graphene layers or are integrated into a graphene sheet. Along with these FeN 4 /C sites having a porphyrin-like FeN 4 C 12 structure, other possible electrocatalytic sites with a FeN 2+2 /C structure ( Figure 2) were already proposed by Dodelet and co-authors [4][5][6] (the reader is also referred to the literature cited in Ref. 1) based on the results obtained with different spectroscopic methods (X-ray, Mössbauer and ToF SIMS: secondary ion time of flight spectroscopy).…”

mentioning

confidence: 81%

Thermodynamic Stability in Acid Media of FeN₄-Based Catalytic Sites Used for the Reaction of Oxygen Reduction in PEM Fuel Cells

Glibin

Dodelet

2017

J. Electrochem. Soc.

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Two types of Fe-based catalytic sites have been proposed in the literature to perform the oxygen reduction reaction in PEM fuel cells running with FeN4-based electrocatalysts: [FeN4/C] or [FeN4C12] derived from the molecular structure of iron-porphyrin, and [FeN2+2/C], derived from the structure of the iron complex with two phenanthroline molecules. The energetics and chemical thermodynamic stability (equilibrium constants, Kc, for iron acid leaching) of these two types of sites and some of their oxygenated forms have been determined at pH ∼ 0. This does not consider the direct or indirect electrochemical oxidation of these catalytic sites or the electro-corrosion of their support. All evaluated FeN4-based sites are chemically stable in acid at both 298 and 353 K. It is their high values of TΔS contribution to the Gibbs free energy for acid leaching which are responsible for the stability of these catalytic sites. The dioxygen and hydroxyl complexes of [FeN4C12] and [FeN2+2/C] electrocatalysts demonstrate an improved stability with increasing temperature, explained by their electron withdrawing properties and their effect on the number of electrons in the antibonding orbitals. Complexes with dioxygen are more resistant to the action of acid than the ones formed by chemisorption of OH-groups.

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“…The oxygen reduction process was tested using unmodified as well as HS-GA or HS-AB modified gold electrodes. It is well known that gold catalyzes the oxygen reduction process [37,38,39]. First, the oxygen reduction process was tested on the unmodified gold electrode (Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Design of Therapeutic Self-Assembled Monolayers of Thiolated Abiraterone

et al. 2018

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The aim of our work was to synthetize of a new analogue of abiraterone—thiolated abiraterone (HS-AB) and design a gold surface monolayer, bearing in mind recent advances in tuning monolayer structures and using them as efficient drug delivery systems. Therapeutic self-assembled monolayers (TSAMs) were prepared by chemically attaching HS-AB to gold surfaces. Their properties were studied by voltammetry and atomic force microscopy (AFM). A gold electrode with immobilized thioglycolic acid (HS-GA) was used for comparison. The surface concentration of HS-AB on the gold surface was 0.572 nmol/cm2, determined from the area of the voltammetric reduction peaks (desorption process). The area per one molecule estimated from the voltammetry experiments was 0.291 nmol/cm2. The capacity of thus prepared electrode was also tested. The calculated capacity for the HS-AB modified electrode is 2.90 μF/cm2. The obtained value indicates that the monolayer on the gold electrode is quite well ordered and well-packed. AFM images show the formation of gold nanoparticles as a result of immersing the HS-AB modified gold electrode in an aqueous solution containing 1 mM HAuCl4·3H2O. These structures arise as a result of the interaction between the HS-AB compound adsorbed on the electrode and the AuCl4− ions. The voltammetric experiments also confirm the formation of gold structures with specific catalytic properties in the process of oxygen reduction.

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Electrocatalysis in Fuel Cells

Abstract: Sacrificial template-based synthesis of unified hollow porous palladium nanospheres for formic acid electro-oxidation.

Cited by 86 publications

References 15 publications

Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Thermodynamic Stability in Acid Media of FeN₄-Based Catalytic Sites Used for the Reaction of Oxygen Reduction in PEM Fuel Cells

Design of Therapeutic Self-Assembled Monolayers of Thiolated Abiraterone

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Electrocatalysis in Fuel Cells

Abstract: Sacrificial template-based synthesis of unified hollow porous palladium nanospheres for formic acid electro-oxidation.

Cited by 86 publications

References 15 publications

Sustainable CO2-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Sustainable CO2-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Thermodynamic Stability in Acid Media of FeN4-Based Catalytic Sites Used for the Reaction of Oxygen Reduction in PEM Fuel Cells

Design of Therapeutic Self-Assembled Monolayers of Thiolated Abiraterone

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Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Thermodynamic Stability in Acid Media of FeN₄-Based Catalytic Sites Used for the Reaction of Oxygen Reduction in PEM Fuel Cells