Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Zellner, Michael B.; Chen, Jingguang G.

doi:10.1016/j.susc.2004.07.029

Cited by 42 publications

(21 citation statements)

References 37 publications

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“…Vibrational studies using HREELS have been performed to further understand the reactions of CH 3 OH, H 2 O and CO on the various surfaces discussed above [1][2][3][4][5][6][7][8]. For example, Fig.…”

Section: Hreels Resultsmentioning

confidence: 99%

“…Fundamental surface science techniques confirmed that the reaction pathways of methanol, water, and CO on the PVD tungsten carbides and Pt-modified tungsten carbides were similar to those on their respective single crystal surfaces [6,7]. In addition, ex-situ cyclic voltammetry (CV) measurements indicated that phase pure WC PVD films were stable in an acidic environment when placed under typical anodic potentials.…”

Section: Introductionmentioning

confidence: 85%

“…Recently our group has published a series of papers on surface science and electrochemical studies aimed at evaluating the feasibility of using tungsten carbides as fuel cell anode electrocatalysts for direct methanol fuel cell (DMFC) [1][2][3][4][5][6][7][8]. In this manuscript we will provide an overview of these studies, as well as some recent results on this subject.…”

Section: Introductionmentioning

confidence: 99%

“…More recent studies from our group focused on bridging the materials gap between model single crystal surfaces and the more realistic, polycrystalline tungsten carbide thin film surfaces produced by physical vapor deposition (PVD) [6,7]. Fundamental surface science techniques confirmed that the reaction pathways of methanol, water, and CO on the PVD tungsten carbides and Pt-modified tungsten carbides were similar to those on their respective single crystal surfaces [6,7].…”

Section: Introductionmentioning

confidence: 99%

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A Combined Surface Science and Electrochemical Study of Tungsten Carbides as Anode Electrocatalysts

et al. 2007

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An effective anode electrocatalyst in direct methanol fuel cell (DMFC) should have high activity for the oxidation of methanol and the decomposition of water, while remaining stable under the relatively harsh anode environment. Although the Pt/Ru bimetallic alloy is currently the most effective anode electrocatalyst, both Pt and Ru are expensive due to limited supplies and both are susceptible to CO poisoning. Consequently, the discovery of less expensive and more CO tolerant alternatives to the Pt/Ru catalysts would help facilitate the commercialization of DMFC. In this paper we will discuss the possibility of using tungsten carbides (WC) and Pt-modified WC as potential anode electrocatalysts in DMFC. We will provide an overview of our recent work, using a combined approach of fundamental surface science studies and in-situ electrochemical evaluation of the activity and stability of tungsten carbides. We will demonstrate the feasibility to bridge fundamental surface science studies on single crystals with the electrochemical evaluation on polycrystalline WC films. We will also discuss the synergistic effect by supporting low coverages of Pt on the WC substrate to further enhance the electrochemical performance of WC.

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Section: Hreels Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Combined Surface Science and Electrochemical Study of Tungsten Carbides as Anode Electrocatalysts

et al. 2007

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“…Scans were taken with an anode potential of 16 kV, emission current of 15 mA, and a base pressure of less than 1.3 × 10 − 5 Pa. Binding energy assignments were referenced to single-crystal carbidic C 1s and W 4f peaks [36]. For atomic ratio calculations, the following equation was used [37]:…”

Section: Methodsmentioning

confidence: 99%

Chemical vapor deposition of phase-rich WC thin films on silicon and carbon substrates

et al. 2008

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Carbon Nanotubes Strengthened Nanophase WC‐Co Hard Alloys

Tan

2006

Adv Eng Mater

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A novel approach employing C2H2 instead of CO as carburization agent has been applied to fabricate nanophase WC‐Co composite alloys being strengthened by carbon nanotubes and nanorods, which were formed in‐situ during C2H2 carburization process. The sintered composite alloys show exceptionally high microhardness. Carbon nanotubes are supposed to play roles on strengthening the matrix and prohibiting growth of WC grains, thus greatly improving the mechanical properties of the matrix.

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Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Cited by 42 publications

References 37 publications

A Combined Surface Science and Electrochemical Study of Tungsten Carbides as Anode Electrocatalysts

A Combined Surface Science and Electrochemical Study of Tungsten Carbides as Anode Electrocatalysts

Chemical vapor deposition of phase-rich WC thin films on silicon and carbon substrates

Carbon Nanotubes Strengthened Nanophase WC‐Co Hard Alloys

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