Nanoscale titania ceramic composite supports for PEM fuel cells

Armstrong, Karen J.; Elbaz, Lior; Bauer, Elizabeth; Burrell, Anthony K.; McCleskey, T. Mark; Brosha, Eric L.

doi:10.1557/jmr.2012.169

Cited by 20 publications

(13 citation statements)

References 18 publications

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“…A third catalyst sample comprised of Pt deposited on the Pt-free Mo 2 C via incipient wetness technique 13 was prepared and this served as an empirical comparison of performance between the sample with imbedded Pt and one with Pt disposition conducted using methods common to the preparation of Pt/C fuel cell catalysts.…”

Section: Resultsmentioning

confidence: 99%

Evidence of High Electrocatalytic Activity of Molybdenum Carbide Supported Platinum Nanorafts

Elbaz

Phillips

Artyushkova

et al. 2015

J. Electrochem. Soc.

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A remarkable new supported metal catalyst structure on Mo 2 C substrates, 'rafts' of platinum consisting of less than 6 atoms, was synthesized and found to be catalytically active electrocatalyst for oxygen reduction. A novel catalytic synthesis method: Reduction-Expansion-Synthesis of Catalysts (RES-C), from rapid heating of dry mixture of solid precursors of molybdenum, platinum and urea in an inert gas environment, led to the creation of unique platinum Nanorafts on Mo 2 C. The Pt Nanorafts offer a complete utilization of the Pt atoms for electrocatalysis with no "hidden" atoms. This structure is strongly affected by its interaction with the substrate as was observed by XPS. In this work, we show for the first time, evidence of electrocatalytic activity with such small clusters of non-crystalline Pt atoms as catalysts for oxygen reduction. Electrochemical half-cell characterization shows that this structure permit more efficient utilization of platinum, with mass activity conservatively measured to be 50% that of platinum particles generated using traditional approaches. Moreover, as cathode fuel cell catalysts, these novel material may dramatically enhance stability, relative to the commercial Pt/carbon catalysts.

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Section: Resultsmentioning

confidence: 99%

Evidence of High Electrocatalytic Activity of Molybdenum Carbide Supported Platinum Nanorafts

Elbaz

Phillips

Artyushkova

et al. 2015

J. Electrochem. Soc.

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“…Powder conductivity was measured using a two‐point method developed by Elbaz et al . A small portion of powder (typically 25–30 mg) was placed in a Teflon cylinder (0.25′′ diameter) and compacted by two 0.25′′ diameter alumina rods with tips covered in an Au foil.…”

Section: Methodsmentioning

confidence: 99%

Electrocatalytically Active Silver Organic Framework: Ag(I)‐Complex Incorporated in Activated Carbon

et al. 2019

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Silver is known as a viable alternative for platinum group metals for the catalysis of the oxygen reduction reaction in alkaline electrolyte. Unlike most other platinum-group metal-free catalysts, usually organo-metallic complexes, silver is commonly used in its metallic form (Ag(0)). Herein, we describe the preparation, characterization, and electrochemical activity of a unique silver-based catalyst, based on Ag(I) ions coordinated to oxygen groups in an organic ligand (benzene tricarboxylic acid -BTC) which forms a metal organic framework, similar to first-row transition metal-based catalysts in metal organic frameworks. When the silver-based catalyst is incorporated in a porous carbon support, it exhibits high electrocatalytic activity for the oxygen reduction reaction, with a distinct electrochemical behavior, different than metallic silver. In addition, the use of the ionic form of the silver, which is atomically dispersed, allows to lower its loading of the metal by at least one order of magnitude when compared to other reported silver-based oxygen reduction reaction catalysts. Results and DiscussionAg-BTC and Ag-BTC@AC were synthesized according to the procedure described in the experimental section. Two-probes bulk conductivity measurements showed that the AgBTC is practically an insulator, as many other metal-BTC, [5,8] unlike the high electronic conductivity of metallic silver. Therefore, AgBTC cannot be utilized as a stand-alone electrocatalyst/electrode in [a] S.

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“…In spite of that, it was widely studied as a ceramic support promoting ORR in PEMFC. In a recent study [13], the synthesis of high surface area TiO2 and TiO composite materials in a single step was presented. The high surface area conductive titanium oxide was successfully synthesized using the polymer-assisted deposition technique [31].…”

Section: Titanium Oxidementioning

confidence: 99%

“…Many ceramic supports were developed in order to increase the durability of fuel cells. Supports such as titanium-oxides [13,14], molybdenum-nitride [15], tungsten-oxide [16], and others were synthesized. Most of these possess some of the qualities needed for a good FC electrode (mechanical properties, thermal stability, chemical corrosion resistance), but lack others, such as good electrical conductivity and high surface area.…”

Section: Introductionmentioning

confidence: 99%

Advances in Ceramic Supports for Polymer Electrolyte Fuel Cells

Lori

Elbaz

2015

Catalysts

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Durability of catalyst supports is a technical barrier for both stationary and transportation applications of polymer-electrolyte-membrane fuel cells. New classes of non-carbon-based materials were developed in order to overcome the current limitations of the state-of-the-art carbon supports. Some of these materials are designed and tested to exceed the US DOE lifetime goals of 5000 or 40,000 hrs for transportation and stationary applications, respectively. In addition to their increased durability, the interactions between some new support materials and metal catalysts such as Pt result in increased catalyst activity. In this review, we will cover the latest studies conducted with ceramic supports based on carbides, oxides, nitrides, borides, and some composite materials.

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Nanoscale titania ceramic composite supports for PEM fuel cells

Abstract: Abstract

Cited by 20 publications

References 18 publications

Evidence of High Electrocatalytic Activity of Molybdenum Carbide Supported Platinum Nanorafts

Evidence of High Electrocatalytic Activity of Molybdenum Carbide Supported Platinum Nanorafts

Electrocatalytically Active Silver Organic Framework: Ag(I)‐Complex Incorporated in Activated Carbon

Advances in Ceramic Supports for Polymer Electrolyte Fuel Cells

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