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The invention relates to the field of electrochemical technology and provides a ligand-protected Pt 6 Subnanometer cluster and its preparation method, a catalyst, its preparation method and application. In the present invention, phosphine compounds are used as ligands, weakly polar solvents with a polarity value of 1 to 5 are used as solvents for ligands, and amine complexes are used as reducing agents. The quantity is precisely controlled to realize the Pt 6 Synthesis of subnanometer clusters. Carbon supported Pt provided by the invention 6 Subnanometer cluster catalysts including carbon supports and ligand-protected Pt supported on carbon supports 6 Subnanometer clusters, under ligand protection, Pt 6 Sub-nanometer clusters can exist stably, and are not easy to agglomerate in the catalytic process; the carbon-supported Pt provided by the invention 6 Subnano-cluster catalysts have ultra-high mass activity and good stability for hydrogen oxidation reactions, and their mass activity and durability are higher than commercial Pt / C catalysts, which have broad application prospects.

The invention discloses a high-efficiency doping method of a doped NbOx platinum-based catalyst used for fuel cell catalysts, and relates to a preparation method of doped NbOx powder. The purpose of the invention is to solve the problems of low conductivity and poor catalysis activity of present NbOx oxides. The method comprises the following steps: 1, preparing a precursor; 2, roasting; 3, doping; and 4, adjusting the pH value of a reaction solution III, carrying out suction filtration, cleaning, and drying to obtain the doped NbOx platinum-based catalyst used for fuel cell catalysts. The half-wave potential of the doped NbOx platinum-based catalyst used for fuel cell catalysts, prepared in the invention, is 0.79-0.86 V, and is more positive than that of a carbon supported platinum catalyst, and the mass activity of the doped NbOx platinum-based catalyst is high, can reach 173.44 mAmgPt<-1> and is 2.96-5.3 times higher than that of the carbon supported platinum catalyst. The doped NbOx platinum-based catalyst used for fuel cell catalysts can be obtained through the high-efficiency doping method.

The invention discloses a preparation method and application of an iridium oxide nanoparticle catalyst. In the invention, a mixed solution comprising a polymer and an iridium-containing compound is uniformly coated on the treated conductive substrate, and then calcined in an air atmosphere to allow the When the iridium-containing compound is converted into iridium oxide, the polymer is decomposed, and the iridium oxide nanoparticle material with small particle size, amorphous and porous structure is obtained, and the polymer remaining on the iridium oxide nanoparticle material is removed by a plasma generator. , enriching the surface of iridium oxide nanoparticles with hydroxyl groups. The invention utilizes the thin film formed by the polymer in the mixed solution to solve the problem of agglomeration to form large particles when the iridium-containing compound is calcined to generate iridium oxide nanoparticles, thereby obtaining iridium oxide nanoparticles with small particle size. In addition, the present invention also uses a plasma generator to remove the polymer remaining in the calcination process, so as to increase the contact area of ​​the iridium oxide nanoparticles, thereby improving the catalytic efficiency of the iridium oxide nanoparticles.

According to one embodiment, a catalyst-supporting substrate comprises a substrate and a catalyst layer including a plurality of pores, the catalyst layer being supported on the substrate. The average diameter of the section of the pore when the catalyst is cut in the thickness direction of the thickness is 5 nm to 400 nm, and the long-side to short-side ratio of the pore on the section is 1:1 to 10:1 in average.