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10 results on '"Mormiche, C."'

5. The dynamics of the dissociative adsorption of methane on Pt(533)

Author

Gee, A.T., Hayden, B.E., Mormiche, C., Kleyn, A.W., and Riedmuller, B.

Abstract

The influence of well-defined steps on the dynamics of the dissociative chemisorption of methane on Pt(533) has been investigated using molecular beam techniques. The initial dissociative chemisorption probability S-0 has been determined as a function of incident energy E-i, angle of incidence theta(i), and surface temperature T-S. For incident kinetic energies in the range 26

Published
2003

8. Combinatorial Electrochemical Screening of Fuel Cell Electrocatalysts

Author

Guerin, S., Hayden, B. E., Lee, C. E., Mormiche, C., Owen, J. R., Russell, A. E., Theobald, B., and Thompsett, D.

Abstract

Combinatorial methods have been applied to the preparation and screening of fuel cell electrocatalysts. Hardware and software have been developed for fast sequential measurements of cyclic voltammetric and steady-state currents in 64-element half-cell arrays. The arrays were designed for the screening of high-surface-area supported electrocatalysts. Analysis software developed allowed the semiautomated processing of the large quantities of data, applying filters that defined figures of merit relevant to fuel cell catalyst activity and tolerance. Results are presented on the screening of carbon-supported platinum catalysts of varying platinum metal loading on carbon (and thus, particle size) in order to demonstrate the speed and sensitivity of the screening methodology. CO electro-oxidation, oxygen reduction, and methanol oxidation on a series of such catalysts reveal clear trends in characteristics and activities. Catalysts with smaller particle sizes reveal structure in the CO stripping voltammetry that can be associated with edge sites in addition to the closely packed planes, and this is concomitantly reduced as particle size is increased. Specific activity for steady-state methanol oxidation and oxygen reduction at room temperature in H2SO4 electrolyte is found to be a maximum for the largest particle sizes, in agreement with the literature. These trends in activity are significantly smaller than the differences in activities of promoted platinum-based alloy catalysts for the same reaction.

Published
2004

9. High throughput methodology for synthesis, screening, and optimization of solid state lithium ion electrolytes.

Author

Beal MS, Hayden BE, Le Gall T, Lee CE, Lu X, Mirsaneh M, Mormiche C, Pasero D, Smith DC, Weld A, Yada C, and Yokoishi S

Subjects
Ions, Lanthanum chemistry, Neural Networks, Computer, Principal Component Analysis, Titanium chemistry, X-Ray Diffraction, Electrolytes chemistry, High-Throughput Screening Assays methods, Lithium chemistry
Abstract

A study of the lithium ion conductor Li(3x)La(2/3-x)TiO(3) solid solution and the surrounding composition space was carried out using a high throughput physical vapor deposition system. An optimum total ionic conductivity value of 5.45 × 10(-4) S cm(-1) was obtained for the composition Li(0.17)La(0.29)Ti(0.54) (Li(3x)La(2/3-x)TiO(3)x = 0.11). This optimum value was calculated using an artificial neural network model based on the empirical data. Due to the large scale of the data set produced and the complexity of synthesis, informatics tools were required to analyze the data. Partition analysis was carried out to determine the synthetic parameters of importance and their threshold values. Multivariate curve resolution and principal component analysis were applied to the diffraction data set. This analysis enabled the construction of phase distribution diagrams, illustrating both the phases obtained and the compositional zones in which they occur. The synthetic technique presented has significant advantages over other thin film and bulk methodologies, in terms of both the compositional range covered and the nature of the materials produced.

Published
2011
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10. High-throughput synthesis and screening of ternary metal alloys for electrocatalysis.

Author

Guerin S, Hayden BE, Lee CE, Mormiche C, and Russell AE

Abstract

We report the application of a new method for the high-throughput synthesis and screening of thin film materials and its application to the discovery of electrocatalysts. Results are presented for the PtPdAu ternary alloy system with respect to activity for oxygen reduction. The results reveal an enhancement in activity for a range of PtPd alloy compositions over either of the pure elements. An optimum composition range of ternary alloys with significant activity was also identified. A correlation was also investigated between the surface reduction potential and the activity for oxygen reduction in both binary and ternary alloys. The results demonstrate the potential of the methodology for the discovery and optimization of electrocatalysts for a wide range of applications.

Published
2006
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