Platinized mesoporous tungsten carbide for electrochemical methanol oxidation

Ganesan, Raman; Ham, Dong Jin; Lee, Jae Sung

doi:10.1016/j.elecom.2007.08.002

Cited by 123 publications

(73 citation statements)

References 13 publications

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“…In addition to the synergistic effect for methanol oxidation discussed above, a strong bifunctional effect was suggested of Pt and WC for CO resistance. This group also reported that specific activities (above 200 mA/cm 2 at 0.75 V vs Ag/AgCl) of 3.5 wt% and 7.5 wt% loaded tungsten carbide (WC) were higher than those of Pt/W 2 C and commercial catalyst (20 wt% PtRu/C, E-Tek) for methanol oxidation as shown in Figure 8, [84]. Also, 20 wt% Pt/W 2 C electrocatalysts showed the higher mass current density (mA/mg Pt ) than 20 wt% Pt/C at the same potential in 0.5 M H 2 SO 4 electrolyte, SCE reference electrode [90].…”

Section: Oxidation Of Methanol and Ethanol On Tmcsmentioning

confidence: 96%

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: Oxidation Of Methanol and Ethanol On Tmcsmentioning

confidence: 96%

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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“…Bu nedenle sert dolgu alaşımlarının abrazif aşınma dirençlerini belirlerken, hem matrisin hem de matris içindeki sert partiküllerin sertlikleriyle, bu sert partiküllerin matris içindeki boyutları, morfolojileri ve kimyasal kompozisyonları birlikte ilişkilendirilmelidir [15]. Numune 5'in XRD sonuçlarına göre (Şekil 6) sert dolgu içinde Cr esaslı M 7 C 3 karbürünün yanı sıra Mo ve W esaslı MC karbürleri de gözlemlenmiştir [1,[23][24][25][26][27][28][29]. Molibden ve tungsten matris içinde sert karbürler oluşturduğu için [30] numune 5'in abrazif aşınmaya direncinin yüksek çıkmasını M 7 C 3 karbürleri ile birlikte sağladığı düşünülmektedir.…”

Section: Sert Dolguların İç Yapı Karakteristikleri Ve Xrd Analizleri unclassified

Kli̇nker Ve Fari̇ni̇n Aşindirici Olduğu Koşullarda Çi̇mento Üreti̇mi̇nde Öğütücü Olarak Kullanilan Demi̇r Esasli Sert Dolgu İle Kaplanmiş Aşinma Plakalarinin Abrasi̇f Aşinma Di̇rençleri̇ni̇n Beli̇rlenmesi̇

Gençer¹,

Owsalou²,

Karadeniz³

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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According to tribology theories and wear mechanisms, several techniques are used for preventing and reducing wear. In repair-maintenance welding which is one of these methods, surface of main material is covered with wear high resistant hardfacing materials and thus, materials can be used again in industry. The aim of this experimental study is determining of influences of farin (cement's raw material) and clinker (cement's semi finished product) on abrasive wear conditions of wear plates that were coated with hardfacing alloy and used as grinders in cement production. Coatings were deposited onto EU S355JO steel plates with shielded metal arc welding (SMAW) method by using five different commercial hardfacing electrode. Abrasive wear tests were done with dry sand-rubber wheel abrasive wear testing machine according to Procedure A indicated in ASTM G65 test standard. However in wear tests, farin and clinker abrasives were used instead of quartz abrasives which as stated in ASTM G65 standard. Thus, determination of abrasive wear resistances of wear plates were become more realistic. Microstructure examinations were done by using optical microscopy (OM) and scanning electron microscopy (SEM). Additionally, formed phases in hardfacing coatings were determined by X-ray diffraction (XRD) analysis for supporting microstructure examinations. Vickers hardness measurements of coatings were done in room temperature. 0.17341/gummfd.48584

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Platinized mesoporous tungsten carbide for electrochemical methanol oxidation

Cited by 123 publications

References 13 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

Kli̇nker Ve Fari̇ni̇n Aşindirici Olduğu Koşullarda Çi̇mento Üreti̇mi̇nde Öğütücü Olarak Kullanilan Demi̇r Esasli Sert Dolgu İle Kaplanmiş Aşinma Plakalarinin Abrasi̇f Aşinma Di̇rençleri̇ni̇n Beli̇rlenmesi̇

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