Abstract:
A method for producing a catalyst supporting a metal or an alloy on a support, including: independently controlling a temperature of a first supercritical fluid to be first temperature, the first supercritical fluid containing a precursor of the metal or precursor of the alloy that is dissolved in a supercritical fluid; independently controlling a temperature of the support to be a second temperature higher than the temperature of the first supercritical fluid; and supplying the first supercritical fluid controlled to the first temperature to the support, to cause the metal or the alloy to be supported on the support.
Abstract:
The present invention aims to provide a gas diffusion electrode and a method of making the same for alkaline fuel cells, metal-air batteries or brine electrolysis cells which, more in detail, can provide electrolysis performance almost equivalent to the conventional one without using expensive platinum catalyst, and is superior in durability as electrode in electrolysis in alkaline solution or at the time of emergency shut down and in stability in a long time operation. The present invention aims to provide an oxygen gas diffusion electrode for alkaline fuel cells, metal-air batteries or brine electrolysis cells used in an alkaline aqueous solution, characterized in that powder state carbon-based electrode catalyst comprising silk-derived activated carbon containing silk-derived nitrogen is supported on the surface of a porous conductive substrate.
Abstract:
A natural gas reforming catalyst includes a metal core and rhodium deposited on the metal core. A natural gas reformer includes a hydrocarbon inlet, a reforming catalyst for generating hydrogen from a hydrocarbon and water and a hydrogen outlet. The reforming catalyst includes a metal core and a rhodium layer deposited on the metal core. A method for preparing a natural gas reforming catalyst includes adding a rhodium compound and a metal core to a reaction vessel and depositing the rhodium compound on the metal core.
Abstract:
A method of forming a catalyst material includes coating agglomerates of catalyst support particles with an ionomer material. After coating the agglomerates of catalyst support particles, a catalyst metal precursor is deposited by chemical infiltration onto peripheral surfaces of the agglomerates of catalyst support particles. The catalyst metal precursor is then chemically reduced to form catalyst metal on the peripheral surfaces of the agglomerates of catalyst support particles.
Abstract:
L'invention concerne une pile à combustible (1), comprenant : - une membrane échangeuse de protons (120); - une anode (122) et une cathode (124), la cathode (124) délimitant un conduit d'écoulement entre une zone d'entrée de dioxygène (162) et une zone de sortie d'eau (164). La cathode (124) comprend un support du matériau catalyseur incluant un premier matériau graphité (Z6) et un deuxième matériau (Z5), ce deuxième matériau présentant une résistance à la corrosion par l'oxygène supérieure à la résistance du matériau graphité, la quantité de ce deuxième matériau au niveau de la zone d'entrée étant supérieure à la quantité de ce deuxième matériau au niveau de la sortie. La cathode comprend une première couche (Z6) incluant le premier matériau et une deuxième couche incluant le deuxième matériau, l'épaisseur de la deuxième couche (Z5) décroissant entre la zone d'entrée (162) et la zone de sortie (164).
Abstract:
Noble metal nanoparticles and their preparation process. It is provided homogeneous Pt/Ag single wall nanoparticles with a hollow interior, as well to the process for their preparation, and the uses of the nanoparticles as drug delivery carrier, catalytic cathode in fuel cells, or catalyst in oxidation reactions.
Abstract:
A catalyst layer comprising: (i) a first catalytic material, wherein the first catalytic material facilitates a hydrogen oxidation reaction suitably selected from platinum group metals, gold, silver, base metals or an oxide thereof; and (ii) a second catalytic material, wherein the second catalytic material facilitates an oxygen evolution reaction, wherein the second catalytic material comprises iridium or iridium oxide and one or more metals M or an oxide thereof, wherein M is selected from the group consisting of transition metals and Sn, wherein the transition metal is preferably selected from the group IVB, VB and VIB; characterised in that first catalytic material is supported on second catalytic material, is disclosed. The catalyst can be used in fuel cells, supported on electrodes or polymeric membranes for increasing tolerance to cell voltage reversal.
Abstract:
The invention relates to Membrane Electrode Assemblies ("MEAs") for solid- polymer-electrolyte proton-conducting membrane fuel cells ("PEM-FCs") having better performance and improved durability, in particular when operated under severe electro-chemical conditions such as fuel starvation and start-up/shut-down cycling. The MEAs are characterized in that at least one of its two electrode layers (EL and/or EL2) contains a first electrocatalyst (EC1) comprising an iridium oxide component in combination with at least one other inorganic oxide component anda second electrocatalyst (EC2/EC2'), which is free from iridium. Preferably, an iridium oxide/titania catalyst is employed as EC1. The MEAs reveal better performance, in particular when operated under severe operating conditions such as fuel starvation and start-up/shut-down cycling.
Abstract:
The present invention relates to a method for fabricating electrodes for a fuel cell and to a one-compartment fuel cell. In particular, a method for fabricating an electrode for a bio-fuel cell comprises the steps of fabricating a buckypaper electrode support material; providing a suspension of carbon nanotubes; decorating said carbon nanotubes with a catalytically active component thereto; and coating at least one surface of said buckypaper electrode support material with said decorated suspension. Furthermore, a fuel cell comprises an anode for performing an oxidation of a fuel component, said anode being formed from a buckypaper electrode support material with a coating on at least one surface, said coating being fabricated from decorated carbon nanotubes; and a cathode for performing a reduction of dioxygen molecules, said cathode being formed from a buckypaper electrode support material with a coating on at least one surface, said coating being fabricated from decorated carbon nanotubes.