Proposed is an iridium alloy catalyst having reversible catalytic activity for an oxygen evolution reaction (OER), a hydrogen evolution reaction (HER), and a hydrogen oxidation reaction (HOR) by including an iridium alloy including iridium (Ir) and nickel (Ni). The iridium alloy catalyst according to the present disclosure is rapidly converted to an iridium alloy catalyst in an oxide form and an iridium alloy catalyst in a metallic form according to applied voltage by controlling its crystallinity. Thus, even in case an oxide layer is formed after the OER, the oxidation layer disappears during the HER and HOR and the properties of an iridium metal catalyst remain, thereby maintaining HER/HOR performance.

The invention relates to a method for producing a supported catalyst material for a fuel-cell electrode, as well as a catalyst material that can be produced using said method. In the method, first, a carbide-forming substance is deposited from the gas phase onto the carbon-based carrier material to produce a carbide-containing layer and, then, a catalytically-active precious metal or an alloy thereof from the gas phase is deposited to form a catalytic layer. By chemical reaction of the carbide-forming substance with the carbon, very stable carbide bonds are formed at the interface, while an alloy phase of the two forms at the interface between carbide-forming substance and precious metal. Overall, a very stable adhesion of the catalytic precious metal to the substrate results, whereby degradation effects are reduced, and the life of the material is extended.

Disclosed are a method of manufacturing an anode dual catalyst for a fuel cell so as to prevent a reverse voltage phenomenon and a dual catalyst manufactured by the same. The method may include supporting effectively metal catalyst particles and oxide particles on a conductive support, and thus, a dual catalyst manufactured using the method may be suitably used for controlling a reverse voltage phenomenon that occurs at the anode.

The present disclosure provides a preparation method of a catalyst slurry for a fuel cell membrane electrode assembly (MEA), including the following steps: preparing a slurry mixture with a catalyst, a dispersing solvent, an ionomer, a thickener, and a surfactant according to a certain mass ratio; subjecting the slurry mixture to pre-dispersion several times in an ultrasonic disperser and a high-shear emulsifying machine successively, to obtain a slurry pre-dispersion; and conducting dispersion on the slurry pre-dispersion in a high-pressure homogenizer to obtain the catalyst slurry. In the present disclosure, components of the catalyst slurry and a dispersion process are optimized and innovated, to construct a more effective three-phase interface. The MEA prepared according to the present disclosure has a significantly improved performance and reduced slurrying time; and is thus suitable for mass production.

Disclosed herein is a cathode structure, a membrane-electrode assembly including the same, and a fuel cell including the same.

Core-shell nanoparticles having a solid core comprising a first metal and a shell comprising a second metal disposed at least a portion of the exterior surface of the core. The core-shell nanoparticles comprise a non-precious transition metal and the second metal comprises a precious metal or semi-precious metal. The core-shell nanoparticles can be used to catalyze oxygen reduction reactions. Also provided are compositions comprising the core-shell nanoparticles, methods of making same, and devices of same.

Disclosed are a catalyst for an electrochemical cell and a method of manufacturing the catalyst. The catalyst includes a support, a first catalyst supported on the support, wherein the first catalyst is a catalyst for hydrogen oxidation reaction (HOR) or oxygen reduction reaction (ORR), a second catalyst supported on the first catalyst, wherein the second catalyst is a catalyst for oxygen evolution reaction (OER), and a protective layer formed on the first catalyst and the second catalyst.

A bifunctional catalyst and a preparation method therefor are provided. The bifunctional catalyst is prepared by providing carbon matrix, adding 0.01-10 mol/L platinum containing solution, 0.01-10 mol/L palladium containing solution, 0.01-10 mol/L silver containing solution, and 0.01-15 mol/L sodium citrate trihydrate solution to the carbon matrix for reacting at 20° C. to 80° C. for 0.5 h to 24 h to obtain a mixed solution, and adding reducing agent to the mixed solution for reacting for 0.5 h to 30 h, and centrifuging and drying so as to obtain the bifunctional catalyst.

A catalyst for a fuel cell anode comprises an alloy of Pd and at least two other transition metals, at least one of which which binds to hydrogen and/or carbon monoxide at least as strongly as Pd does. Suitable transition metals which bind more strongly are Co, W, Ti, V, Cr, Fe, Mo, Nb, Hf, Ta, Zr and Re. PdCoW is the most preferred alloy. The catalyst is used on the anode of a hydrogen oxidising fuel cell, such as a PEMFC to catalyse the hydrogen oxidation reaction.

The present invention provides a supported metal catalyst with excellent effectiveness factor of active metal particles which are also free from deactivation by contacting with ionomer.

According to the present invention, provided is a supported metal catalyst, comprising a support that is a collective body of conductive particles; and dispersed active metal particles supported on the conductive particles, wherein the conductive particles include a plurality of pores, an average entrance pore diameter of the pores is 1 to 20 nm, a standard deviation of the average entrance pore diameter is equal to or less than 50% of the average entrance pore diameter, a number fraction of the active metal particles supported in a surface layer region of the conductive particles divided by the total number of the active metal particles is equal to or more than 50%, and the surface layer region is a region on a surface of the conductive particles or a region in the pores within a depth of 15 nm from the surface.