An anticorrosive, conductive material includes a first oxide having oxygen vacancies and a formula (I): MgTi.sub.2O.sub.5-δ (I), where .sub.δ is any number between 0 and 3 optionally including a fractional part denoting the oxygen vacancies; and a second oxide having a formula (II): Ti.sub.aO.sub.b (II), where 1<=a<=20 and 1<=b<=30, optionally including a fractional part, the first and second oxides of formulas (I) and (II) forming a polycrystalline matrix.

Disclosed are a mixed catalyst, a method for preparing same, a method for forming an electrode by using same, and a membrane-electrode assembly comprising same, the mixed catalyst having uniform physical features within a predetermined range, which are suitable for the manufacture of an electrode and membrane-electrode assembly having desired performance and durability. The mixed catalyst comprises: a first catalyst, which includes a first support and first catalyst metal particles distributed on the first support, and has a first BET surface area and a first total pore volume; and a second catalyst, which includes a second support and second catalyst metal particles distributed on the second support, and has a second BET surface area different from the first BET surface area and a second total pore volume different from the first total pore volume.

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.

A method for inspecting a membrane electrode structure (1) which includes a first step in which detection medium capable of detecting elements of a first electrode catalyst layer (12) and a second electrode catalyst layer (22) and an element of a metal foreign matter (40) is sent along a thickness direction from the side of a first electrode layer (10) to a second electrode layer (20) side to obtain a thickness direction profile of a detection signal, and a second step in which an analysis unit identifies a thickness direction position of the metal foreign matter (40), from intensity of the detection signal in the thickness direction profile, and in which the analysis unit identifies thickness direction positions of the first and second electrode catalyst layer (12)(22), or a thickness direction position of an electrolyte membrane (30), from the intensity of the detection signal in the thickness direction profile.

Mesoporous carbon has a connecting structure in which primary particles made of carbon particles having primary pores with a primary pore diameter of less than 20 nm are connected. In the mesoporous carbon, the pore capacity of secondary pores with secondary pore diameters within a range of 20 nm to 100 nm, which is measured by a mercury intrusion method, is 0.42 cm.sup.3/g or more and 1.34 cm.sup.3/g or less. In addition, the mesoporous carbon has a linearity of 2.2 or more and 2.6 or less. An electrode catalyst for a fuel cell includes the mesoporous carbon and catalyst particles supported in the primary pores in the mesoporous carbon. Furthermore, a catalyst layer includes the electrode catalyst for the fuel cell and a catalyst layer ionomer.

Nanoporous oxygen reduction catalyst material comprising PtNiIr. The nanoporous oxygen reduction catalyst material is useful, for example, in fuel cell membrane electrode assemblies.

Provided is a method with which it is possible to easily produce an electrode catalyst having excellent catalytic performance such as kinetically controlled current density. The method involves: a dispersion liquid preparation step of preparing a dispersion liquid by mixing (i) at least one type of solvent selected from the group consisting of sulfoxide compounds and amide compounds, (ii) a catalyst carrier powder constituted by a metal oxide, (iii) a platinum compound, (iv) a transition metal compound, and (v) an aromatic compound including a carboxyl group; and a loading step of heating the dispersion liquid to thereby load a platinum alloy of platinum and a transition metal on a surface of the catalyst carrier powder.

The present disclosure relates to a composition that includes a solid, a first layer of an ionic liquid including an anion and a cation, a second layer including an ionically conductive ionomer, and a catalyst including a metal positioned on the solid, where the ionic liquid forms a first layer on the solid, the first layer is positioned between the second layer and the solid, and the catalyst is positioned between the solid and the first layer.

A method includes converting ˜9 nm soft-magnet Al—CoPt into a hard-magnet L1.sub.0-CoPt, acid etching the hard-magnet L1.sub.0-CoPt, and annealing the acid etched hard-magnet L1.sub.0-CoPt to generate a L1.sub.0-CoPt/Pt catalyst.

To provide a catalyst layer, a catalyst layer forming liquid, and a membrane electrode assembly, capable of forming a fuel cell excellent in power generation efficiency.

The catalyst layer of the present invention comprises a supported catalyst having a carrier containing a metal oxide and a catalyst supported on the carrier; and a polymer having at least one type of units containing a cyclic ether structure, selected from the group consisting of units (u11), units (u12), units (u21) and units (u22), and having an ion-exchange group, wherein the total of the content of the units containing a cyclic ether structure is at least 30 mol % to all units which the polymer contains:

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