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Zhutaeva, G. V.; Radyushkina, K. A.; Marinich, M. A.; Bogatyreva, G. P.; Тарасевич, М. Р.

doi:10.1023/a:1012371030158

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…However, a sonicating process helped to obtain stable electrophoretically active dispersions with reproducible properties. 22,23 The applied voltage, time of deposition, and concentration of suspension were tuned to obtain layers of varying thickness. The thickness of the electrophoretically deposited diamond nanoparticle layers was determined by using a scanning electron microscope ͑JEOL 5800 LV͒.…”

Section: Methodsmentioning

confidence: 99%

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Riveros

Soto

Scibioh

et al. 2010

J. Electrochem. Soc.

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Dimensionally stable, high surface area support for a possible direct methanol fuel cell application was fabricated from commercial diamond nanoparticles through electrophoretic deposition onto silicon wafer substrates, and their electrochemical characteristics were examined by employing inorganic redox probes such as ͓Fe͑CN͒ 6 ͔ 3−/4− and ͓Ru͑NH 3 ͒ 6 ͔ 3+/2+ . As-received diamond nanoparticles were purified by refluxing in an aqueous nitric acid solution, and the product was characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, prompt gamma-ray neutron activation analysis, Raman spectroscopy, electron energy loss spectroscopy, and transmission electron microscopy techniques. Electrophoretically deposited diamond nanoparticle layers of uniform thickness were obtained by controlling experimental parameters, such as applied voltage, deposition time, and the concentration of diamond nanoparticles in the suspension. Platinum nanoparticles were electrodeposited onto these diamond nanoparticle layers ͑Pt/DNP͒ by step and sweep potential method. Their structural and morphological characterizations were made by using scanning electron microscopy and energy-dispersive X-ray analysis. The electrochemical activity of Pt/DNP toward methanol oxidation was studied. The present study paves a way to fabricate ultrathin, uniform, high surface area, and dimensionally stable diamond electrodes in a controllable fashion. This type of deposited diamond nanoparticle layers may be considered as catalyst support material for fuel cell applications. © 2010 The Electrochemical Society. ͓DOI: 10.1149/1.3374403͔ All rights reserved. Fuel cells attract tremendous attention in the present days as environmentally sustainable systems.1 Especially, direct methanol fuel cells are developed for transportation and portable power supply applications. In spite of the numerous demonstration systems, the commercialization is hampered due to the prohibitively high costs and durability of materials. Regarding cost reduction, the noble-metal loadings must drop to a level of Ͻ1.0 mg cm −2 from the present 2.0-8.0 mg cm −2 , depending on the applications. Loading reduction through increasing platinum utilization is one of the approaches. Non-noble catalyst development is another approach. Designing high performance electrodes would be yet another approach. Dispersing catalysts on electrically conducting, high surface area carbon materials is a significant step forward to achieve a finer dispersion of the metal catalyst and to get a high electrochemically active surface area.

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Section: Methodsmentioning

confidence: 99%

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Riveros

Soto

Scibioh

et al. 2010

J. Electrochem. Soc.

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“…The vital role of carbon support in the ORR activity of the electrocatalysts has been well recognized. − In 2008, Charreteur et al proposed a structure for most FeN x /C active sites based on their earlier Fe–N 2 /C and FeN 4 /C structures (Figure S2). One year later, Lefèvre et al produced microporous carbon-supported Fe-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Identification of a Robust and Durable FeN₄C_x Catalyst for ORR in PEM Fuel Cells and the Role of the Fifth Ligand

et al. 2022

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Although recent studies have advanced the understanding of pyrolyzed Fe−N−C materials as oxygen reduction reaction (ORR) catalysts, the atomic and electronic structures of the active sites and their detailed reaction mechanisms still remain unknown. Here, based on first-principles density functional theory (DFT) computations, we discuss the electronic structures of three FeN 4 catalytic centers with different local topologies of the surrounding C atoms with a focus on unraveling the mechanism of their ORR activity in acidic electrolytes. Our study brings back a forgotten, synthesized pyridinic Fe−N coordinate to the community's attention, demonstrating that this catalyst can exhibit excellent activity for promoting direct fourelectron ORR through the addition of a fifth ligand such as −NH 2 , −OH, and −SO 4 . We also identify sites with good stability properties through the combined use of our DFT calculations and Mossbauer spectroscopy data.

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“…The main factors that should be considered when employing a material as a support are: thermal and chemical stability during the reaction processes and separation stages; accessibility and good dispersion of the active sites. There are a number of materials that, partially or wholly satisfy these requirements, like pillared clays, some carbons and mesoporous aluminosilicates [7,8]. However, carbon blacks are somewhat unstable for electrochemical oxidation, which is a disadvantage of this type of support.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic preparation and characterization of porous electrodes from diamond nanoparticles

Riveros¹,

Soto²,

Tryk³

et al. 2007

J. Phys.: Conf. Ser.

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Untitled

Cited by 9 publications

References 4 publications

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Identification of a Robust and Durable FeN₄C_x Catalyst for ORR in PEM Fuel Cells and the Role of the Fifth Ligand

Electrophoretic preparation and characterization of porous electrodes from diamond nanoparticles

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Untitled

Cited by 9 publications

References 4 publications

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Identification of a Robust and Durable FeN4Cx Catalyst for ORR in PEM Fuel Cells and the Role of the Fifth Ligand

Electrophoretic preparation and characterization of porous electrodes from diamond nanoparticles

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Product

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Identification of a Robust and Durable FeN₄C_x Catalyst for ORR in PEM Fuel Cells and the Role of the Fifth Ligand