The disclosure includes a platinum-based alloy catalyst and a preparation method thereof, a membrane electrode and a fuel cell. The method for preparing the platinum-based alloy catalyst comprises the following steps: (1) preparing nano-sized alloy particles of platinum and 3d transition metal; (2) carrying out acid treatment on the alloy particles prepared in step (1); and (3) annealing the alloy particles treated in step (2). The size of the platinum-based alloy particles is controlled, an atom number ratio of platinum to transition metal in the platinum-based alloy is controlled, and then etching and dissolution of acid is combined so that an atom number ratio of platinum to transition metal is further controlled, subsequently annealing is carried out at high temperature. The prepared platinum-based alloy catalyst improves the stability and durability of the platinum-based alloy catalyst, which supports the large-scale application of the platinum-based alloy catalyst in the fuel cell.

The present disclosure relates to a fuel cell catalyst and a manufacturing method thereof. The fuel cell catalyst of the present disclosure can be used to manufacture a membrane electrode assembly having a catalyst layer of high density and high dispersion by solving the problem of aggregation of catalyst particles occurring during the formation of the catalyst layer, by using a catalyst including a polydopamine-coated support.

In addition, the method for manufacturing a fuel cell catalyst of the present disclosure does not require a solvent because the catalyst including the polydopamine-coated support and the halide in solid phase are simply heat-treated by solid-to-solid dry synthesis and allows manufacturing of a fuel cell catalyst in short time because a washing process using a solvent and an extraction process for sampling are unnecessary after the synthesis.

A method of coating a membrane having a first side and an opposite second side and carried with its second side adhering to a backer film is provided. The method includes coating the first side of the membrane with a catalyst ink or slurry with the second side adhering to the backer film and curing the coating on the first side. The backer film is then removed to expose the second side of the membrane which is fed onto a vacuum conveyor with the coated first side facing the conveyor. The second side of the membrane is then coated with a catalyst ink or slurry and the coating on the second side cured after which the membrane is removed from the vacuum conveyor.

The present invention concerns a method for preparing a catalyst coated membrane including the steps of: coating a substrate with a first catalyst dispersion thereby obtaining a first catalyst dispersion coated substrate, providing a second side of a membrane with a support film, coating a first side of the membrane with a second catalyst dispersion, thereby obtaining a second catalyst dispersion coated first side of the membrane, drying the first catalyst dispersion thereby obtaining a first catalyst coated substrate or drying the second catalyst dispersion coated first side of the membrane thereby obtaining a second catalyst coated first side of the membrane, laminating the first catalyst coated substrate to the second catalyst dispersion coated first side of the membrane or laminating the first catalyst dispersion coated substrate to the second catalyst coated first side of the membrane so that the first catalyst and the second catalyst superimpose, thereby forming a laminate including a membrane comprising a first catalyst layer, drying the laminate, removing the support film from the second side of the membrane, coating a third catalyst dispersion on the second side of the membrane, drying the third catalyst dispersion, thereby obtaining a second catalyst layer on the membrane, and removing the substrate from the first catalyst coated substrate.

A proton conductor contains a metal oxide that has a perovskite structure and that is represented by formula (1): A.sub.xB.sub.1-yM.sub.yO.sub.3-, where an element A is at least one element selected from the group consisting of Ba, Ca, and Sr, an element B is at least one element selected from the group consisting of Ce and Zr, an element M is at least one element selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, In, and Sc, indicates an oxygen deficiency amount, and 0.95x1 and 0<y0.5 are satisfied.

Provided is an electrolyte layer-anode composite member for a fuel cell, the electrolyte layer-anode composite member including an anode and a solid electrolyte layer having ion conductivity, the anode being an aggregate of granules including a composite metal, the composite metal including a nickel element and an iron element, the granules including a plurality of pores, the composite metal accounting for 80% by mass or more of the anode, the anode having a bulk density of 75% or less of a real density of the composite metal. Also provided is a cell structure including the electrolyte layer-anode composite member for a fuel cell described above, and a cathode arranged on a side of the solid electrolyte layer.

Simplified methods are disclosed for preparing a catalyst coated membrane that is reinforced with a porous polymer sheet (e.g. an expanded polymer sheet) for use in solid polymer electrolyte fuel cells. The methods involve forming a solid polymer electrolyte membrane by coating membrane ionomer solution onto a first catalyst layer and then applying the porous polymer sheet to the membrane ionomer solution coating, while it is still wet, such that the membrane ionomer solution only partially fills the pores of the porous polymer sheet. A second catalyst ink is then applied which fills the remaining pores of the porous polymer sheet. Not only are such methods simpler than many conventional methods, but surprisingly this can result in a marked improvement in fuel cell performance characteristics.

Disclosed are a membrane-electrode assembly for fuel cells, a method of manufacturing the same and a fuel cell system containing the same. The membrane-electrode assembly for fuel cells includes an anode and a cathode facing each other, and a polymer electrolyte membrane interposed between the anode and the cathode, wherein at least one of the anode and the cathode further includes a porous support and a catalyst layer for fuel cells disposed on one surface of the porous support. The electrode of the membrane-electrode assembly is a free-standing electrode, and the electrode has excellent adhesivity to the polymer electrolyte membrane and thus can prevent performance deterioration resulting from detachment of the electrode from the polymer electrolyte membrane during operation of fuel cells, and in particular, can secure high durability since the electrode is not readily detached even under harsh operation environments.

The present invention relates to a method of manufacturing an electrolyte membrane for fuel cells by transferring antioxidants to the electrolyte membrane. The method may include providing a first membrane including a perfluorinated sulfonic acid-based compound, providing a second membrane including an antioxidant such that the second membrane partially or entirely contacts a surface of the first membrane, transferring or moving the antioxidant of the second membrane to the first membrane, and removing the second membrane.

A method for preparing a platinum-indium cluster catalyst for a fuel cell, the method including steps of: obtaining a carbon powder, dispersing the carbon powder in a strong oxidizing solution, and performing high-temperature hydrothermal treatment to obtain an activated carbon powder; obtaining a mixed alcohol solution comprising a platinum precursor and an indium precursor; dispersing the activated carbon powder in the mixed alcohol solution, and heat treating the mixed alcohol solution to volatilize an alcohol solvent to obtain a mixed powder; and performing high-temperature treatment on the mixed powder under a mixed gas atmosphere of hydrogen and argon, to yield a platinum-indium cluster catalyst for a fuel cell.