Abstract:
Free-standing oxygen evolution reaction (OER) anode catalyst layers for a solid polymer electrolyte fuel cell and methods for making them are disclosed. The anode catalyst layers comprise a porous polymer sheet (e.g. expanded PTFE) and a mixture comprising an OER catalyst and a hydrocarbon ionomer which is impregnated in the pores of the porous polymer sheet. Use of such a separate OER anode catalyst layer in a catalyst coated membrane assembly of a fuel cell provides better voltage reversal tolerance than admixtures and use of the hydrocarbon ionomer can slow down dissolution of the OER catalyst. Further, the preparation methods are suitable for mass production.
Abstract:
A process for preparing a catalyst material, said catalyst material comprising a support material, a first metal and one or more second metals, wherein the first metal and the second metal(s) are alloyed and wherein the first metal is a platinum group metal and the second metal(s) is selected from the group of transition metals and tin provided the second metal(s) is different to the first metal is disclosed. The process comprises depositing a silicon oxide before or after deposition of the second metal(s), alloying the first and second metals and subsequently removing silicon oxide. A catalyst material prepared by this process is also disclosed.
Abstract:
The invention is related to a carbon supported catalyst comprising - a carbon-comprising support with a BET surface area in a range from 400m 2 /g to 2000 m 2 /g, - a modifier comprising at least one mixed metal oxide, comprising niobium and titanium, and/or a mixture, comprising niobium oxide and titanium oxide, - a catalytically active metal compound, wherein the catalytically active metal compound is platinum or an alloy comprising platinum and a second metal or an intermetallic compound comprising platinum and a second metal, the second metal being selected from the group consisting of cobalt, nickel, chromium, copper, palladium, gold, ruthenium, scandium, yttrium, lanthanium, niobium, iron, vanadium and titanium. The invention is further related to a process for preparing the carbon supported catalyst.
Abstract:
The invention includes a method of making a catalytic electrode for a metal-air cell in which a carbon-catalyst composite is produced by heating a manganese compound in the presence of a particulate carbon material to form manganese oxide catalyst on the surfaces of the particulate carbon, and then adding virgin particulate carbon material to the carbon-catalyst composite to produce a catalytic mixture that is formed into a catalytic layer. A current collector and an air diffusion layer are added to the catalytic layer to produce the catalytic electrode. The catalytic electrode can be combined with a separator and a negative electrode in a cell housing including an air entry port through which air from outside the container can reach the catalytic electrode.
Abstract:
Cet assemblage membrane-électrodes (AME) comprend une membrane (3) et deux électrodes (2), et en outre au moins une couche (4), située à l'interface de la membrane et d'une électrode. Cette couche contient un polymère conducteur protonique qui présente une température de transition vitreuse inférieure à celle du polymère conducteur protonique contenu dans la membrane et dans les électrodes.
Abstract:
A positive electrode may include an electrically conductive scaffold, conductive catalytic A-site deficient perovskite particles chemically bonded to the scaffold, an ion and gas permeable ionomer connecting the particles, and a hydrophobic porous layer on the scaffold. A secondary air electrode may include conductive bi-functional catalytic A-site deficient perovskite particles including A I -site lanthanum cations and A II -site alkaline earth metal cations, an ion and gas permeable ionomer connecting the particles, and a conductive scaffold in electrical contact with the particles.
Abstract:
A glucose fuel cell for reception into a given constrained volume of implantation in a vertebrate in which the glucose fuel cell has access to fluid containing glucose. The fuel cell includes an anode adapted to oxidize the glucose, a cathode adapted to reduce an oxidant, and a membrane disposed between the anode and the cathode and separating the anode from the cathode. At least one of the anode or cathode define a flexible sheet that is geometrically deformed to be receivable into the given constrained volume of implantation and increase volumetric power density. Related methods of making a glucose fuel cell of this type and implantable assemblies including the glucose fuel cell are also disclosed.