Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing sulfinate without producing a large amount of unnecessary salt. SOLUTION: The invention relates to the method for manufacturing sulfinate with few unnecessary salt comprising reduction of dithionite of alkali metal, alkali earth metal or ammonium by using a carbonyl compound or an imine at pH>6 in manufacturing the sulfinate. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To achieve optimum supporting of a catalyst in an electrode of a polymer-electrolyte membrane fuel cell. SOLUTION: The membrane electrode assembly comprises a polymer-electrolyte membrane with reaction layers applied to both sides and possibly with gas distribution layers. At least one of the reaction layers includes at least one catalytic component and an electron conductor. The method for manufacturing the membrane electrode assembly comprises (A) introduction of ions of the at least one catalytic component into the polymer-electrolyte membrane and/or into an ionomer introduced into the reaction layers, (B) application of the electron conductor to both sides of the polymer-electrolyte membrane, (C) electrochemical deposition of the ions of the catalytic component from the polymer-electrolyte membrane and/or from the ionomer, introduced into the reaction layers, on the electron conductor onto at least one side of the polymer-electrolyte membrane. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
The invention relates to an ion-conducting polymer electrolyte membrane composed of a base with a uniform thickness d with a first surface on the top side of the base and with a second surface on the underside of the base, composed of a first polymer electrolyte membrane material, whereby at least a portion of at least one surface has a three-dimensional structuring composed of at least one second polymer electrolyte membrane material, the first and the second polymer electrolyte material being able to be the same or different, and the structuring is obtained by applying the second polymer electrolyte membrane material to the base and by optionally carryout out further treatment. The invention also relates to a method for producing the ion-conducting polymer electrolyte membrane, to an MEA containing at least one aforementioned CCM, to a fuel cell containing at least one aforementioned ion-conducting polymer electrolyte membrane and to the use of at least one aforementioned polymer electrolyte membrane in fuel cells or electrolyte cells.
Abstract:
The invention relates to a process for producing catalyst coated membranes for electrochemical devices, which comprises the steps A) production of a first semifinished product by application of a first ionomer layer to a first carrier, application of an anode catalyst layer to the first ionomer layer using a first catalyst ink, drying of the anode catalyst layer, B) production of a second semifinished product by application of a second ionomer layer to a second carrier, application of a cathode catalyst layer to the second ionomer layer using a second catalyst ink, drying of the cathode catalyst layer, C) removal of the first and second carrier from the first and second ionomer layer, respectively, and joining of the first semifinished product to the second semifinished product by joining of the first ionomer layer to the second ionomer layer.
Abstract:
The invention relates to a method for producing membranes coated with a catalyst on both sides for electrochemical devices, with the following steps : A) producing a first semifinished product by applying a first ionomer layer onto a first support, applying an anode catalyst layer onto the first ionome r layer while using a first catalyst ink, and drying the anode catalyst layer; B) producing a second semifinished product by applying a second ionomer laye r onto a second support, applying a cathode catalyst layer onto the second ionomer layer while using a second catalyst tint, and drying the cathode catalyst layer; C) removing the first and second supports from the first or second ionomer layer and, joining the first semifinished product to the seco nd semifinished product by joining the first ionomer layer to the second ionome r layer.
Abstract:
The present invention relates to a catalyst ink for producing membrane- electrode assemblies for polymer electrolyte fuel cells which comprises, in addition to the typical components - catalyst material, acidic ionomer, and solvent - an additive component comprising at least one low molecular mass organic compound containing at least two basic nitrogen atoms. The invention further relates to processes for producing such catalyst inks and also to their use for producing membrane-electrode assemblies for polymer electrolyte fuel cells.
Abstract:
The present invention relates to a process for preparing aqueous formulations (A) comprising at least one polyaromatic compound bearing acid groups, in particular a sulfonated polyaromatic compound, and also aqueous formulations (A) which have been prepared by the process of the invention. Furthermore, the present invention relates to a process for preparing dried formulations (B) by removing the water from the aqueous formulations (A) and also the dried formulations (B) themselves. The present invention further provides a formulation (C) comprising the dried formulation (B) of the invention and water or the formulation A of the invention and a water-comprising formulation (D) comprising the aqueous formulation (A) or the formulation (C) of the invention and additionally at least 2% by weight of an organic solvent. Furthermore, the present invention relates to dry formulations (E) which are obtained by removing water and solvent from the water-comprising formulations (D) of the invention. The present invention further provides for the use of the water-comprising formulations (D) of the invention and of the dry formulations (E) obtained from these for producing a polymer electrolyte membrane and also the polymer electrolyte membrane itself and a membrane-electrode assembly (MEA) and also a fuel cell comprising the polymer electrolyte membrane of the invention.
Abstract:
The invention relates to the following: a method for production of aqueous formulations (A) containing at least one polyaromatic particularly sulphonat ed compound with acid groups and aqueous formulations (A), produced by said method; a method for production of dried formulations (B) by removal of the water from aqueous formulations (A) and the dried formulation (B) itself; a formulation (C), comprising said dried formulation (B) and water or the formulation (A) and a water-containing formulation (D) containing the aqueou s formulation (A) or the formulation (C) and in addition at least 2 wt. % of a n organic solvent; a dry formulation (E), obtained by removal of water and solvent from the aqueous formulation (D); the use of aqueous formulation (D) and the dry formulation (E) obtained therefrom for the production of a polym er electrolyte membrane itself and a membrane/electrode unit (MEA) and a fuel cell comprising said polymer electrolyte membrane.