Replacing bulk Pt in Pt–Ni–Pt bimetallic structures with tungsten monocarbide (WC): Hydrogen adsorption and cyclohexene hydrogenation on Pt–Ni–WC

Humbert, Michael P.; Menning, Carl A.; Chen, Jingguang G.

doi:10.1016/j.jcat.2010.02.016

Cited by 46 publications

(40 citation statements)

References 35 publications

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“…Figures 1a-1c show that the rates of growth for Pt, Pd, and Ag were linear and exhibited only slight changes in slope with the addition of each monolayer. This is characteristic of the layer-by-layer growth, as discussed by Humbert et al for the Pt/WC system [27]. Increasing Pt coverage on NbC increased activity, until the activity reached a plateau at 2.5ML, close to the measured value for bulk Pt.…”

Section: Dft Calculations Of Hydrogen Binding Energysupporting

confidence: 81%

“…Literature shows that HBE correlates with the exchange current density (i 0 ), the experimental measure of HER and hydrogen oxidation reaction (HOR) activity, in both acidic [24,25] and alkaline environments [26]. The HBE values calculated from density functional theory (DFT) are shown in [7], and Pt/WC [5,27]. Figures 1a-1c show that the rates of growth for Pt, Pd, and Ag were linear and exhibited only slight changes in slope with the addition of each monolayer.…”

Section: Dft Calculations Of Hydrogen Binding Energymentioning

confidence: 99%

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Metal-modified niobium carbides as low-cost and impurity-resistant electrocatalysts for hydrogen evolution in acidic and alkaline electrolytes

Tackett

Kimmel

Chen

2016

International Journal of Hydrogen Energy

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Low-cost and impurity-resistant electrocatalysts for the hydrogen evolution reaction (HER) are desired to replace expensive bulk Pt in membrane electrolysis cells. Monolayer (ML) Pt, Pd, and Ag on niobium carbide (NbC) thin films were synthesized for electrochemical testing as HER catalyst candidates. Density Functional Theory calculations predicted that ML Pt on NbC binds hydrogen similarly to bulk Pt, suggesting good HER activity. These results were confirmed through electrochemical measurements in both acidic and alkaline electrolytes. The Pt/NbC catalyst also maintained its activity in the presence of common impurity ions found in tap water. This makes ML Pt/NbC a promising replacement for Pt in water electrolysis cell cathodes. Future work on high surface area powders should be performed to further assess its suitability as a catalyst for membrane electrolyzers.

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Section: Dft Calculations Of Hydrogen Binding Energysupporting

confidence: 81%

Section: Dft Calculations Of Hydrogen Binding Energymentioning

confidence: 99%

Metal-modified niobium carbides as low-cost and impurity-resistant electrocatalysts for hydrogen evolution in acidic and alkaline electrolytes

Tackett

Kimmel

Chen

2016

International Journal of Hydrogen Energy

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“…The preparation of the WC surface was described in detail elsewhere. 37 Briefly, the WC surface was prepared by carburizing a polycrystalline W foil using cycles of ethylene sputtering at 300 K, followed by annealing the surface to 1200 K. The stoichiometry of the W : C ratio was around 1 : 1, as confirmed by the Auger Electron Spectroscopy (AES), and was consistent with previous studies of the characterization of W terminated WC(0001). 38 The exposure of propanol and propanal was achieved through leak valves.…”

Section: Surface Science Studiessupporting

confidence: 71%

Tungsten carbides as selective deoxygenation catalysts: experimental and computational studies of converting C3 oxygenates to propene

et al. 2014

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The deoxygenation activity and selectivity of tungsten monocarbide (WC) have been investigated using a combination of DFT calculations, surface science experiments, and reactor evaluations of catalyst particles. Both WC surfaces and particles are very selective in breaking the C-O/CvO bond of propanol and propanal, leading to the production of propene as the main product. The consistency of DFT, surface science and reactor studies in predicting the high selectivity in C-O/CvO scission suggests that fundamental studies on model surfaces can be extended to more practical applications. Results from the current paper also identify research opportunities in synthesizing nanoparticle WC and W 2 C as effective deoxygenation catalysts.

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“…From the selective deposition of Pd and PdNi alloys on WC, an electronic interaction between them is also expected. 11 In X-ray absorption near edge spectroscopy (XANES) analysis shown in Fig. 3A and B (also in Fig.…”

mentioning

confidence: 98%

Palladium–nickel alloys loaded on tungsten carbide as platinum-free anode electrocatalysts for polymer electrolyte membrane fuel cells

et al. 2011

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Replacing bulk Pt in Pt–Ni–Pt bimetallic structures with tungsten monocarbide (WC): Hydrogen adsorption and cyclohexene hydrogenation on Pt–Ni–WC

Cited by 46 publications

References 35 publications

Metal-modified niobium carbides as low-cost and impurity-resistant electrocatalysts for hydrogen evolution in acidic and alkaline electrolytes

Metal-modified niobium carbides as low-cost and impurity-resistant electrocatalysts for hydrogen evolution in acidic and alkaline electrolytes

Tungsten carbides as selective deoxygenation catalysts: experimental and computational studies of converting C3 oxygenates to propene

Palladium–nickel alloys loaded on tungsten carbide as platinum-free anode electrocatalysts for polymer electrolyte membrane fuel cells

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