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PRODUCTION OF INHERENTLY SUPPORTED CERMET DIAPHRAGMS AND DIAPHRAGM/ELECTRODE UNITS FOR IMPROVED PRODUCTION OF SYNTHESIS-HYDROGEN.

Objective

RESEARCH WILL ALLOW PRODUCTION OF INHERENTLY SUPPORTED CERMET-DIAPHRAGMS AND DIAPHRAGM/ELECTRODE UNITS BY LOW-COST METHODS. THIS IS HOPED TO REDUCE PRODUCTION COSTS FOR INTERNAL COMPONENTS OF H2O-ELECTROLYSERS BY AT LEAST 30 % ESPECIALLY BY DISPENSING OF NICKEL GAUZE.

CONVENTIONAL SINTER-TECHNIQUES ARE TODAY BEING USED TO PRODUCE NICKEL-NET SUPPORTED CERMET DIAPHRAGMS WHICH SERVE AS ROBUST AND CHEMICALLY VERY STABLE COMPONENTS FOR H2-PRODUCING ELECTROLYZERS WITH LOWERED ENERGY-CONSUMPTIONS.THE INTERNALLY SUPPORTING NICKEL NET WHICH HITHERTO WAS SUPPOSED TO BE UNAVOIDABLE,CAN BE DISPENSED OF,PROVIDED ONE SUCCEEDS IN INCORPORATING INTO THE COMPOSITE AND LAYERED DIAPHRAGM STRUCTURE A COHERENT POROUS METALLIC NICKEL LAYER. THIS TECHNIQUE FURTHER AIMS AT APPLYING POROUS METAL LAYERS ON ONE SIDE OR EVEN ON BOTH SIDES OF THE CERMET ELECTRODE BY CONVENTIONAL TECHNIQUES: PREPARING "GREEN" CERMET AND POROUS METAL SHEETS BY THE DOCTOR-BLADE PROCEDURE AND COMBINING THESE "GREEN" LAYERS TO TWO-LAYERED OR THREE-LAYERED GREENS; SUBSEQUENT REDUCTIVE SINTERING IS EXPECTED TO PRODUCE UNITS COMPOSED OF POROUS METAL LAYERS AND OF INTERCALATED ELECTRICALLY INSULATING CERMET LAYERS (THE DIAPHRAGM). THE POROUS METAL LAYERS ARE SUPPOSED TO FORM SIMULTANEOUSLY THE METALLIC SUPPORT OF THE UNIT AND POROUS ELECTRODES.. CORRESPONDINGLY THE FINAL STEP OF THE R&D WORK AIMS AT ACTIVATING THE POROUS METAL-ELECTRODES. AS CATHODIC ELECTROCATALYSTS ZN AND AL TOGETHER WITH MO WILL BE USED IN ORDER TO FORM RANEY-METALS FOR THE CATHODES AND CO/RU/AG WILL BE APPLIED IN ORDER TO FORM ELECTROCATALYSED ANODES.

STATE OF SDVANCEMENT:
THREE PROGRESS REPORTS HAVE BEEN RECEIVED. AN ONLINE PROCESS HAS BEEN WORKED OUT AND FIRST ELECTROLYSIS EXPERIMENTS WERE MADE. FURTHER WORK WILL BE DONE TO ENLARGE THE SIZE OF THE NICKEL NET FREE EDE UNITS AND TO SCALE UP THE ELECTROLYSIS TEST UNIT.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

DARMSTADT UNIVERSITY OF TECHNOLOGY
Address
Karolinenplatz 5
Darmstadt
Germany