39results about How to "High quality activity" patented technology

The invention discloses a preparation method of a proton exchange membrane fuel battery catalyst. The novel fuel battery catalyst of a core-shell structure consists of a conductive carrier and ternary core-shell structured nano grains; and the preparation method comprises the following steps of: step one, preparing Co particles by reducing CoCl2.6H2O, namely, adding a PVP (Polyvinyl Pyrrolidone) ethanol solution into an ethanol solution of CoCl2 to be used as a stabilizer, and slowly adding a NaBH4 ethanol solution under stirring so as to carry out reduction to prepare the Co particles; step two, preparing Co@Ru core-shell type nano grains by reducing RuCl3 and a Co particle suspension solution by using ethylene glycol; and step three, preparing a ternary core-shell Co-Ru@Pt / C catalyst by further reducing H2PtCl6, the Co@Ru core-shell type nano grains and the mixed suspension solution by using ethylene glycol. The catalyst has the advantages of low Pt capacity and high catalysis activity.

The invention discloses an ultrafine PtRh nanowire, wherein Rh atoms are uniformly doped in the Pt ultrafine nanowire. The invention also discloses a preparation method of the ultrafine PtRh nano wire. The invention also discloses a PtRh / C metal nanometer catalyst. The invention also discloses a preparation method of the above-mentioned PtRh / C metal nano catalyst. The invention also discloses the application of the above-mentioned PtRh / C metal nano-catalyst as a catalyst in the fuel cell cathode oxygen reduction reaction process. The nano crystal obtained by the invention has uniform size, good dispersion, good stability and high catalytic activity.

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.

The invention discloses a Pt-Au@Pt core-shell structure fuel cell cathode catalyst and a preparation method thereof. The Pt-Au@Pt core-shell structure fuel cell cathode catalyst consists of a conductive carrier and Pt-Au@Pt core-shell structure nanoparticles. The preparation method comprises the following steps of: reducing a gold compound by using sodium borohydride to obtain Au nanoparticles, and loading the Au particles on the surface of a carbon carrier to obtain Au / C; and putting Au / C in a platinum compound water solution to obtain loaded-type Pt / Au alloy nanoparticles after Pt is subjected to spontaneous reductive deposition on the Au surface, depositing a Cu atom monolayer on the surface of the Pt-Au alloy nanoparticles by using an underpotential deposition method and then displacing the Cu atom monolayer with Pt to obtain the Pt-Au@Pt core-shell structure fuel cell cathode catalyst. The catalyst prepared by using the preparation method disclosed by the invention is high in catalytic activity and stability and low in cost relative to a pure Pt catalyst; and the preparation method is simple and convenient, mild in condition and easy to operate and can be used for solving the problem that a core-shell structure catalyst prepared by using a conventional chemical reduction method is high in Pt agglomeration degree on the surface and a catalyst prepared by using a single underpotential deposition method is low in Pt coverage degree on the surface.

The invention discloses a graphene-polypyrrole / platinum nano modified glassy carbon electrode and a preparation method for the same. The preparation method particularly includes the steps of polishing a glassy carbon electrode, and preparing a grapheme modified glassy carbon electrode, a graphene-polypyrrole modified glassy carbon electrode and the graphene-polypyrrole / platinum nano modified glassy carbon electrode. The obtained graphene-polypyrrole / platinum nano modified glassy carbon electrode is used as a catalyst for methanol oxidation in a methanol fuel cell. The graphene-polypyrrole / platinum nano modified glassy carbon electrode has the advantages of high dispersion, high catalytic activity and high anti-toxicity.

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.