Molecular oxygen reduction in PEM fuel cell conditions: ToF-SIMS analysis of Co-based electrocatalysts

Article Abstract:

A series of Co-based electrocatalysts are analyzed by ToF-SIMS to gain information on the number and structure of catalytic active sites in these materials. It is interpreted that whatever the Fe precursor was, the same catalytic sites (FeN(sub 2)/C and FeN(sub 4)/C, with their respective dominant ToF-SIMS signatures like FeN(sub 2)C(sub 4)(super +) and FeN(sub 4)C(sub 8)(super +) ions) were found.

ELECTRONIC & OTHER ELECTRIC EQUIPMENT, Fuel Cells & Thermic Generators, All Other Miscellaneous Electrical Equipment and Component Manufacturing, Polyelectrolytes, Analysis, Usage, Oxidation-reduction reactions, Fuel cells, Secondary ion mass spectrometry

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Wavelength- and time-dependent two-photon photoemission spectroscopy of dye-coated silicon surface

Article Abstract:

The effect of photoexcitation of the adsorbed species on the electronic properties of the surface is investigated applying wavelength and time dependent two-photon photoemission spectroscopy. The conclusion states that photoexcitation of a small fraction of the weakly bound RB species causes a significant change in the electronic properties of the substrate.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Silicon, Electric properties, Photoemission, Photons

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O(sub 2) reduction in PEM fuel cells: activity and active site structural information for catalysts obtained by the pyrolysis at high temperature of Fe precursors

Article Abstract:

Catalytic activity for oxygen electroreduction in acidic medium has been studied. Catalysts have been produced by pyrolyzing perylene tetracarboxylic dianhydride combined with Fe and nitrogen precursors.

Oxygen, Industrial Gas Manufacturing, Catalysts, Industrial gases, Oxidation reduction reactions

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