5results about How to "Low platinum loading" patented technology

The invention relates to the technical field of electrochemistry, in particular to a metal-modified platinum-palladium core-shell structure catalyst and a preparation method and application thereof.The catalyst comprises carrier carbon and active components loaded on the surface of the carrier carbon, and the active components comprise platinum, palladium and modified metal; in the catalyst, based on the total weight of the catalyst, the content of the carrier carbon is 60.0 wt.%-80.0 wt.%; the content of platinum is 9.0 wt.% to 18.0 wt.%; the content of palladium is 9.0 wt.% to 18.0 wt.%; the content of the modified metal is 0.5 wt.%-4.0 wt.%; the structure of the active component is a metal-modified platinum-palladium core-shell structure, palladium serves as an inner core, platinum serves as a shell layer, and modified metal is located on the surface and near the surface of the core-shell structure; the modification metal is selected from at least one of IB group metal, VB group metal, VIB group metal and VIIB group metal. According to the catalyst provided by the invention, the platinum-palladium core-shell structure is subjected to surface and near-surface modification by adopting metal, so that the catalytic activity of precious metal platinum is improved.

The invention relates to the technical field of electrochemistry, in particular to a carbon-loaded multi-metal low-platinum core-shell structure catalyst and a preparation method and application thereof.The catalyst comprises carrier carbon and active components loaded on the surface of the carrier carbon, and the active components comprise platinum and transition metal; in the catalyst, based on the total weight of the catalyst, the content of the carrier carbon is 60.0 wt.%-80.0 wt.%; the content of platinum is 5.0 wt.% to 20.0 wt.%; the content of the transition metal is 10.0 wt.%-25.0 wt.%; the structure of the active component is a core-shell structure formed by transition metal and platinum, the transition metal or transition metal alloy is an inner core, and platinum is a shell layer; the transition metal in the transition metal or the transition metal alloy is selected from at least one of IB group metal, IIB group metal and VIII group metal. The catalyst provided by the invention has the advantages of stable core-shell structure, simple preparation, low platinum loading capacity, high catalytic activity, strong durability and the like.

The invention discloses a fluorinated high-entropy platinum alloy catalyst layer with a hydrophobic microenvironment, comprising: a fluorinated high-entropy platinum alloy catalyst; the catalyst layer is composed of a fluorine-doped carbon carrier and a Nafion ionomer solution; wherein the hydrophobicity of the catalyst layer can be further regulated and controlled by doping other light non-metallic elements (N, B) in the particles of the fluorinated high-entropy platinum alloy catalyst and the carbon fluoride carrier. The invention also discloses a construction method and application of the catalyst layer. According to the fluorinated high-entropy platinum alloy catalyst layer with the hydrophobic microenvironment, other non-metallic elements (N and B) except fluorine are doped, so that the hydrophilicity and hydrophobicity of the catalyst layer can be adjusted, the inherent advantages of the high-entropy platinum alloy can be maintained through the synergistic effect of fluorine and other non-metallic elements, and the catalytic performance of the fluorinated high-entropy platinum alloy catalyst layer is improved. The electronic structure and the strain effect of the catalyst can be further optimized, and more reaction sites and reaction paths are provided, so that the activity and the stability of the catalyst are further improved.

The application belongs to the technical field of fuel cells, and specifically discloses a high-temperature PEMFC ordered catalytic layer structure electrode and a preparation method, which comprises the following steps: S1, preparation of a gas diffusion layer, to obtain a gas diffusion layer with a hydrophobic agent mass fraction of 15-25%; S2, preparation of an ordered catalytic layer: placing the gas diffusion layer obtained in S1 and a reaction solution in a reaction container to perform a hydrothermal reaction, performing cleaning, drying and calcination treatment after the reaction is completed, to obtain a catalyst carrier array, loading Pt on the catalyst carrier array by using a formic acid reduction method, and then coating a conductive substance, to obtain an ordered catalytic layer structure electrode. The high-temperature PEMFC ordered catalytic layer structure electrode and the preparation method have the advantages of mild preparation conditions, a simple process, low cost, a more stable structure and excellent durability of the electrode under high-temperature and phosphoric acid conditions, and significant improvement of battery performance and service life.

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to a jack fruit shell grain-shaped alkaline water electrolysis hydrogen production electrode and a preparation method and application thereof. The alkaline electrolytic water hydrogen production electrode comprises a nickel support body and micron-sized granular nickel hydroxide uniformly distributed on the surface of the nickel support body, wherein a platinum catalyst is grown on the surface of the micron-sized granular nickel hydroxide in situ; the preparation method of the alkaline electrolytic water hydrogen production electrode comprises the following steps: immersing a nickel support body into a first electrolyte for first electrochemical deposition to obtain a nickel-supported nickel hydroxide electrode, and immersing the nickel-supported nickel hydroxide electrode into a second electrolyte for second electrochemical deposition to obtain a nickel-supported platinum-loaded nickel hydroxide electrode; according to the preparation method, by selecting a first electrolyte formula, a second electrolyte formula and electrodeposition parameters, the prepared hydrogen production electrode can improve the overall conductivity of a catalyst layer, the limiting space of the hydrogen production electrode promotes ordered migration of hydrogen species on different active sites of platinum / nickel hydroxide, and the hydrogen production electrode is lower in hydrogen production energy consumption and adapts to stable operation of a working condition environment.