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Bayer Aktiengesellschaft

Bayer Materialscience Ag

De Nora Elettrodi S.p.a

Uhdenora Technologies S.r.l.

Peter Fabian

Fritz Gestermann

Andreas Bulan

Hans-Dieter Pinter

Fulvio Federico

Dario Oldani

Leonello Carrettin

Gerd Speer

Robert Scannel

Antonius Fischer

The present invention describes an electrochemical half-cell, comprising a gas space, an electrolyte space and a gas diffusion electrode in the form of a cathode or anode. The gas diffusion electrode separates the gas space from the electrolyte space and comprises an electrically conductive substrate and an electrochemically active coating. The gas diffusion electrode includes a coating-free edge region and is connected to a support structure in the coating-free edge region via an electrically conductive plate, which covers at least the coating-free edge region as well as a coated edge region.

Electrochemical half-cell

Electrode at least comprising an electroconductive support of a titanium-palladium alloy, titanium, tantalum or compounds or alloys of titanium or of tantalum, an electrochemically active coating and an interlayer between the support and the electrochemically active coating, wherein the interlayer consists of titanium carbide and/or titanium boride and is applied to the support by flame or plasma spraying. Process for producing these electrodes and their use in an electrochemical cell for producing chlorine or chromic acid.

Electrode for electrolysis in acidic media

A bipolar assembly for filter-press type electrolyzers is described comprising a single sheet, whose two faces work respectively as anodic and cathodic wall, characterised by a design of perimetral flanges which greatly simplifies its construction enhancing its reliability. The peripheral flanges are made of a first flange obtained by folding the peripheral portion of the single sheet and of a second flange formed by a rod or a tube with quadrangular section or, alternatively, the first and second flange are pre-formed by folding of adequate strips subsequently fixed to the single sheet. The electrolyser resulting from the assemblage of a multiplicity of assemblies of the invention is particularly suited to the process of electrolysis of hydrochloric acid solutions carried out with chlorine-evolving anodes and oxygen-consuming cathodes.

Bipolar assembly for filter-press electrolyzer

The invention relates to an electrochemical half cell ( ) which consists of at least one membrane ( ), an electrode ( ) as anode or cathode which optionally produces gas, optionally an outlet ( ) for the gas and a support structure ( ) linking the electrode which optionally produces gas with the back wall ( ) of the half cell. The support structure ( ) divides the interior ( ) of the half cell ( ) into vertically arranged channels ( ). The electrolyte ( ) flows upwards in the electrode channels ( ) facing the electrode ( ) and flows downwards in the channels ( ) facing away from the electrode ( ). The electrode channels ( ) and the channels ( ) facing away from the electrode ( ) are interlinked at their upper and lower ends.

Membrane electrolytic cell with active gas/liquid separation

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Gelnhausen, Germany

Peter Fabian