Pt/WC as an anode catalyst for PEMFC: Activity and CO tolerance

Ham, Dong Jin; Kim, Young Kwon; Han, Seung Hyun; Lee, Jae Sung

doi:10.1016/j.cattod.2007.12.076

Cited by 102 publications

(58 citation statements)

References 17 publications

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“…Pure WC and cobalt containing WC showed high current density in a half cell test under 1% CO/99% H 2 flow as shown in Figure 4 [78]. The difference of current density was just 2~6% with and without CO. Also, 7.5 wt% Pt/WC electrocatalyst showed the 7% decrease of EAS value in a half cell system under 1% CO/99% H 2 gas dissolved in 1 M H 2 SO 4 electrolyte ( Figure 5) [79].…”

Section: Co Oxidation On Tmcsmentioning

confidence: 99%

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

2009

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Transition metal carbides (TMCs) and transition metal nitrides (TMNs) have attracted attention as promising electrocatalysts that could replace noble metals of high price and limited supply. Relative to parent metals, TMC and TMN behave like noble metals for electrochemical reactions such as oxidation of hydrogen, CO and alcohols, and reduction of oxygen. When TMC and TMN are combined with other metals, the electrocatalytic synergy is often observed in electrochemical reactions. Thus, combinations with a minute amount of Pt or even non-Pt metals give performance comparable to heavily loaded Pt-based electrocatalysts for low temperature fuel cells. It appears that TMC based electrocatalysts are more active as anode catalysts for oxidation of fuels, whereas TMN based catalysts are more active for cathode catalysts for oxygen reduction and more stable.

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Section: Co Oxidation On Tmcsmentioning

confidence: 99%

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

2009

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“…The improved electrochemical performance of the tungsten carbide based Pt catalyst [7][8][9][10][11][12][13], and the controversial results [14][15][16][17][18] regarding the electrochemical stability of tungsten carbide motivated the authors to make a thorough investigation of the physical, chemical, and electrochemical properties of WC to evaluate its possibility as a PEM fuel cell catalyst support.…”

Section: Introductionmentioning

confidence: 99%

“…Modification of carbon with tungsten carbide could also improve the thermal stability of the support. Ganesan and Ham [11][12][13] synthesized high surface area tungsten carbide (W 2 C) microspheres and WC supports using a carbon sphere template. The catalyst with Pt (7.5%) loading on the W 2 C microsphere showed higher activity towards methanol electro-oxidation than the conventional 20% Pt-Ru/Vulcan catalyst [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Ganesan and Ham [11][12][13] synthesized high surface area tungsten carbide (W 2 C) microspheres and WC supports using a carbon sphere template. The catalyst with Pt (7.5%) loading on the W 2 C microsphere showed higher activity towards methanol electro-oxidation than the conventional 20% Pt-Ru/Vulcan catalyst [11][12][13]. This is possibly due to a co-catalytic effect between Pt and tungsten carbide: tungsten carbide activates methanol to form a methoxy intermediate, and Pt promotes the decomposition of the methoxy species [12].…”

Section: Introductionmentioning

confidence: 99%

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Nanocrystalline tungsten carbide (WC) synthesis/characterization and its possible application as a PEM fuel cell catalyst support

Zhu

Ignaszak

Song

et al. 2012

Electrochimica Acta

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a b s t r a c tNanocrystalline tungsten carbide (WC) with a high surface area and containing minimal free carbon was synthesized via a polymer route. Its physical properties, including solubility in acid solution, electronic conductivity, and thermal stability, were thoroughly studied at two elevated temperatures: 95• C and 200• C. Compared to commercially available WC, this in-house synthesized WC showed lower solubility in acidic media at 200• C, higher electronic conductivity (comparable to that of carbon black), as well as higher thermal stability. However, this material exhibited low electrochemical stability in acidic media when subjected to potential cycling at potentials larger than 0.7 V vs. RHE, due to the electrooxidation of WC. The major product of WC electrooxidation is WO 3 , which was confirmed by X-ray photon spectroscopy measurements. Pt was uniformly deposited on the high surface area WC to form a 20 wt% of Pt supported catalyst for the oxygen reduction reaction (ORR). The ORR mass activity was then obtained using the rotating disk electrode technique.Crown

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“…Pt supported on mesoporous tungsten carbide (WC-phase) might serve as an effective CO tolerant electro-catalyst for hydrogen than a commercial Pt/C catalyst [129]. Pt/WO 3 -C, Pt-Ru/WO 3 and Pt-Ru-W 2 C show improved activity in a CO containing H 2 stream [130][131][132].…”

Section: Co Tolerant Catalystsmentioning

confidence: 99%

Components for PEM Fuel Cells: An Overview

Maiyalagan

Pasupathi

2010

MSF

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Abstract. Fuel cells, as devices for direct conversion of the chemical energy of a fuel into electricity by electrochemical reactions, are among the key enabling technologies for the transition to a hydrogen-based economy. Among the various types of fuel cells, polymer electrolyte membrane fuel cells (PEMFCs) are considered to be at the forefront for commercialization for portable and transportation applications because of their high energy conversion efficiency and low pollutant emission. Cost and durability of PEMFCs are the two major challenges that need to be addressed to facilitate their commercialization. The properties of the membrane electrode assembly (MEA) have a direct impact on both cost and durability of a PEMFC.An overview is presented on the key components of the PEMFC MEA.. The success of the MEA and thereby PEMFC technology is believed to depend largely on two key materials: the membrane and the electro-catalyst. These two key materials are directly linked to the major challenges faced in PEMFC, namely, the performance, and cost. Concerted efforts are conducted globally for the past couple of decades to address these challenges. This chapter aims to provide the reader an overview of the major research findings to date on the key components of a PEMFC MEA.

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Pt/WC as an anode catalyst for PEMFC: Activity and CO tolerance

Cited by 102 publications

References 17 publications

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

Nanocrystalline tungsten carbide (WC) synthesis/characterization and its possible application as a PEM fuel cell catalyst support

Components for PEM Fuel Cells: An Overview

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