Leibniz-institut Fur Plasmaforschung Und Technologie E.v.

Heraeus Electro-nite International N.v.

Pre Power, Recycling, Energyservice Gmbh

Volker Brüser

Ulrich Guth

Norbert Rossow

Barbara Roth

Gustav Sievers

Stephan Reuter

Pablo Collantes-jiménez

Kirsten Anklam

Sven Jakubith

Christian Walter

Angela Kruth

Florian Steffen

Described herein is a method for manufacturing a catalytically-active membrane-electrode-assembly () with one or more, particularly two electrodes, the method comprising at least the steps of: i) depositing a heterogenous layer () on a substrate (), the heterogeneous layer () comprising a base metal () and a noble metal () heterogeneously distributed in the heterogenous layer (), ii) leaching of the base metal () out of the heterogeneous layer (), such that a first self-supporting nanoporous catalyst layer () comprising the noble metal () is formed on the substrate (), iii) adding of at least one kind of proton-conductive ionomers () and/or at least one kind of hydrophobic particles () and/or an ionic liquid () to the first self-supporting nanoporous catalyst layer (), and iv) forming a catalytically-active membrane-electrode-assembly () by attaching the self-supporting nanoporous catalyst layer () to a first side of a membrane (), such that a catalytically-active membrane-electrode-assembly () with one electrode is formed.

Method and device for forming a catalytically-active membrane or a membrane-electrode-assembly

The invention relates to a device () for disintegrating particles () of a suspension with ultrasonic sound, the device () comprising:

Device and method for chemo-physical modification of particles of a suspension

Porous, ceramic layers, which also have a diffusion-limiting action, are as a rule manufactured by selectively adding pore formers to the ceramic sinter material. The porosity of the layer created in this way lies in the micrometer range. The known processes for manufacturing layers of this type are intended for application to planar substrates. Suitability for spherical surfaces and a porosity of the layer in the nanometer range is provided herein by an oxide ceramic powder having a BET specific surface area in the range of about 5 to 50 m.sup.2 /g and having a mean primary particle size of about 20 to 450 nm. The powder is first pretreated at a temperature of about 800.degree. C. to 1150.degree. C. and then mixed with untreated, oxide ceramic powder. The mixture is then applied to a high temperature-stable base, and burned-in (fired) at a temperatures of about 1000.degree. C. to 1350.degree. C. Optionally, instead of the thermally pretreated oxide ceramic powder, a recrystallized glass powder can be used. The firing temperature range in this case, however, is about 850.degree. C. to 1000.degree. C.

Process for manufacturing ceramic, diffusion-limiting layers and use of

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Greifswald, Germany

Volker Brüser