Disclosed is a method of preparing an intermetallic catalyst that includes irradiating ultrasonic waves to a precursor admixture including a noble metal precursor, a transition metal precursor, and a carrier to form core-shell particles including a transition metal oxide coating layer; the annealing the core-shell particles to form intermetallic particles including a transition metal oxide coating layer; and the removing the transition metal oxide coating layer from the intermetallic particles.

Provided is a method of manufacturing a supported catalyst and a supported catalyst manufactured using the same. The method may prevent the growth of catalytic metal particles by repeatedly applying heat, so the method is simpler and more economical than conventional processes. Moreover, since the support in the supported catalyst thus manufactured includes a hollow having a predetermined size, an electrode manufactured using the supported catalyst may ensure a desired electrode thickness even when used in a relatively small amount compared to the conventional technology. Moreover, water generated during operation of a fuel cell can be efficiently discharged, so desired mass transfer resistance can be exhibited, and a high electrochemically active surface area (ECSA) and superior catalytic activity can be attained.

A fuel cell electrode catalyst includes catalyst metal particles and electrically conductive support particles supporting the catalyst metal particles. In the fuel cell electrode catalyst, a proportion of a surface area occupied by the catalyst metal particles with particle sizes of 4.5 nm or less to a surface area of the catalyst metal particles calculated from a transmission electron microscope image is 5% or less.

A fuel cell electrode catalyst includes: catalyst metal particles containing at least one of platinum or a platinum alloy; and support particles supporting the catalyst metal particles. The crystallite size 2r obtained from an X-ray diffraction image of the catalyst metal particles is 3.8 nm or less, where r represents a crystallite radius of the catalyst metal particles obtained from the X-ray diffraction image. The amount of CO adsorption Y (mL/g−Pt) on the fuel cell electrode catalyst satisfies Y≤40.386/r+1.7586.

To obtain deuterium in a gas state from a mixed gas of hydrogen and deuterium at a low cost.

A first electrode 11 is an electrode made of a metal allowing hydrogen (H component and D component) to permeate therethrough (hydrogen permeable metal), and the hydrogen permeable metal is Pd, for example. H ions and D ions having permeated through the first electrode 11 flow to the side of a second electrode 12 in a proton conduction layer 20. When the first electrode 11 is used as an anode and the second electrode 12 as a cathode, H ions and D ions flow in the proton conduction layer 20 from the left to the right in the drawing. In that case, hydrogen component in an input gas is more likely to flow into an atmosphere on the cathode side than deuterium component, and an H/D composition ratio accordingly becomes higher in a product gas than in the input gas. In an exhaust gas extracted after H and D components in the input gas are thus consumed, D component has been enriched.

The present disclosure relates to a fuel cell catalyst, a fuel cell electrode including the same, and a membrane-electrode assembly including the same. In one embodiment, the fuel cell catalyst includes: a support including a titanium oxynitride represented by the following Formula 1: TiO.sub.1-yN.sub.y, wherein 0.05<y<0.9; and an active material supported on the support.

Disclosed are a catalyst for a fuel cell having excellent performance and durability, a method for manufacturing same, and a membrane-electrode assembly comprising same. The catalyst for a fuel cell of the present invention comprises: a support; and PtCo alloy particles supported on the support, wherein the PtCo alloy particles comprise a transition metal-doped or transition metal-partially alloyed surface that is modified with at least one transition metal selected from the group consisting of V, Cr, Mn, Fe, Ni, Cu, W, and Mo, or a transition metal-doped or transition metal-partially alloyed internal region including the transition metal.

Disclosed are an electrode for a fuel cell, a method for manufacturing same, and a membrane-electrode assembly comprising same, the electrode having high durability by preventing catalyst degradation due to the agglomeration, deposition, elution, and/or migration of metal catalyst particles. The electrode for a fuel cell of the present invention comprises: a catalyst comprising a carrier and metal catalyst particles supported on the carrier; and an ionomer layer coated on at least a portion of the catalyst, wherein the ionomer layer comprises an ionomer and a chelating agent.

To provide an electrocatalyst for fuel cells, which is configured to ensure both the initial performance and durability of fuel cells. An electrocatalyst for fuel cells, wherein the electrocatalyst comprises a carbon support including a mesopore and a catalyst alloy supported on the carbon support, and the catalyst alloy is a catalyst alloy of platinum and a transition metal; wherein the mesopore includes at least one throat; wherein an average effective diameter of the at least one throat is 1.8 nm or more and less than 3.2 nm; and wherein a transition metal ratio of the catalyst alloy supported on a deeper-side region than the at least one throat, is lower than the transition metal ratio of the catalyst alloy supported on a nearer-side region than the at least one throat.

Methods and compositions for making fuel cell components are described. In one embodiment, the method comprises providing a substrate, and forming or adhering an electrode on the substrate, wherein the forming includes depositing an aqueous mixture comprising water, a water-insoluble component, a catalyst, and an ionomer. The water-insoluble component comprises a water-insoluble alcohol, a water-insoluble carboxylic acid, or a combination thereof. The use of such water-insoluble components results in a stable liquid medium with reduced reticulation upon drying, reduced dissolution of the substrate, and reduced penetration of the pores of the substrate.