摘要:
An object of the present invention is to provide a catalyst-coated membrane suitable for achieving a polymer electrolyte fuel cell that sufficiently prevents a decrease in the initial characteristics and also exhibits sufficient cell performance for a long period of time and has excellent durability. In at least the cathode catalyst layer, the ratio (W P /W Cat-C ) of the weight of the polymer electrolyte (W P ) to the weight of the catalyst-carrying carbon (W Cat-C ) is decreased from an innermost layer positioned closest to the polymer electrolyte membrane toward an outermost layer positioned farthest from the polymer electrolyte membrane. The ratio (W P /W Cat-C ) in the innermost layer is 0.8 to 3.0, and the ratio (W P /W Cat-C ) in the outermost layer is 0.2 to 0.6.
摘要:
The invention concerns porous substrates impregnated with metal catalyst, in particular intended for use as electrodes in a fuel cell such as a proton exchange membrane cell, and method for preparing same. In particular, the present invention concerns a method for impregnating a porous substrate with metal catalyst by high power impulse magnetron sputtering of one or more metal targets, the target(s) and the substrate being placed in an enclosure containing a gaseous plasma medium, the metal of the target(s) being chosen from the transition metals and the alloys of same, said method comprising the following steps: a) applying a pulsed voltage U t to the target, b) polarising the porous substrate by applying a pulsed voltage U s with a delay Δt relative to the start of step (a).
摘要:
A positive electrode (10) for an air cell of the present invention includes: a catalyst layer (11) composed of a porous layer containing electrical conductive carbon (1), a binder (2), and a catalyst component (3); and a fluid-tight gas-permeable layer (12) composed of a porous layer containing an electrical conductive carbon (1a) and a binder (2). The fluid-tight gas-permeable layer is stacked on the catalyst layer. This configuration can facilitate series connection of the air cells while preventing electrolysis solution from leaking out of a positive electrode. It is therefore possible to enhance the manufacturing efficiency and handleability of the air cells.
摘要:
Es wird ein Sauerstoffverzehrelektrode, insbesondere für den Einsatz in der Chloralkali-Elektrolyse, mit einer neuartigen Katalysatorbeschichtung sowie eine Elektrolysevorrichtung beschrieben. Die Sauerstoffverzehrelektrode ist eine mehrlagige Elektrode für die Sauerstoffreduktion in wässrigen alkalischen Medien, mindestens aufweisend einen Träger, der insbesondere elektrisch leitend ist, eine einen Katalysator enthaltende Schicht und eine hydrophobe Schicht, wobei die Elektrode eine dem Sauerstoff enthaltenden Gas und eine dem alkalischen Elektrolyten zugewandte Seite aufweist, wobei die Elektrode mindestens zwei verschiedene den Katalysator enthaltende Schichten hat, die einen unterschiedlichen Gehalt an Katalysator aufweisen, und bei der die äußerste, der Gasseite zugewandte Schicht einen geringeren Anteil an Katalysator hat als die äußerste der Elektrolytseite zugewandte Schicht und der Anteil an hydrophobem Material in der hydrophoben Schicht maximal 8 Gew.-% beträgt. Es wird ferner ein Herstellungsverfahren für die Sauerstoffverzehrelektrode sowie ihre Verwendung in der Chloralkali-Elektrolyse oder Brennstoffzellentechnik beschrieben.
摘要:
The invention relates to a fuel cell (1) comprising: a proton-exchange membrane (120); and an anode (122) and a cathode (124) that are fixed either side of the proton-exchange membrane, the anode (122) defining a flow channel between a dihydrogen inflow area (168) and a dihydrogen outflow area (166). The anode (122) has a lower quantity of catalyst at the dihydrogen outlet (166) than at the dihydrogen inlet (168). The thickness of the anode (122) decreases continuously between the inflow area (168) and the outflow area (166).
摘要:
Ruthenium or a Ruthenium compound is applied to an anode structure according to a predetermined pattern, with only part of the anode active area containing Ru. The parts of the MEA that do not contain Ru are not expected to suffer degradation from Ru cross-over, so that overall degradation of the cell will be diminished. Having less precious metals will also translate into less cost.
摘要:
A method of manufacturing an electrode, comprises the steps of: mixing dry carbon and dry binder particles; subjecting the dry mixture to particle-to-particle collisions with sufficient high force to cause particle size reduction without adding liquid, yielding a dry material that is a homogeneous dry free-flowing powder.