7 results about "Platinum nanoparticles" patented technology

The invention relates to the field of nano-enzymes, in particular to a nano-enzyme, a preparation method and a method for detecting glucose by using the nano-enzyme. The nano-enzyme comprises a carrier and platinum nano-particles coated on the surface of the carrier, and the carrier is oxidized nano-diamond particles with the particle size of 20-30 nm. The core structure of the nano-enzyme, namely a composite system of the carrier and the platinum nano-particles, is defined, the platinum nano-particles serve as a metal nano-material with excellent catalytic performance and are a core component for simulating peroxidase activity, the size of the oxidized nano-diamond carrier is controlled to be 20-30 nm, the dispersity of the material is guaranteed, and the catalytic activity of peroxidase is improved. And the catalytic efficiency of the composite system can be further improved through a size effect. According to the structural design, the problems of insufficient catalytic activity and poor stability of a single nano material are solved through the synergistic effect of the carrier and the load component, and a material foundation is laid for subsequent efficient glucose detection.

The application discloses HZSM-5 molecular sieve, a preparation method and application thereof, and belongs to the field of molecular sieve catalysts. The HZSM-5 molecular sieve comprises a flaky HZSM-5 molecular sieve base body and platinum nano-particles loaded on the flaky HZSM-5 molecular sieve base body; and the average thickness of the flaky HZSM-5 molecular sieve base body is 50-100 nm. The flaky HZSM-5 molecular sieve base body can provide acid centers, the platinum nano-particles can provide hydrogenation centers, and the two can cooperate to achieve good catalytic activity; and the flaky HZSM-5 molecular sieve base body has a relatively thin thickness, i.e. a relatively short b-axis channel length, which is not only beneficial to material diffusion and transmission, but also can greatly reduce the case that intermediate products contact acid sites to cause side reactions, and therefore can provide higher product selectivity. In particular, the HZSM-5 molecular sieve has a good application prospect in catalyzing bio-oil hydrodeoxygenation.

The invention provides a monatomic platinum nano antibacterial agent as well as a preparation method and application thereof, and relates to the technical field of biomedical materials. The monatomic platinum nano antibacterial agent comprises monatomic platinum, nano particles and a surface ligand, the surface ligand is at least one of polyvinylpyrrolidone, polyethylene glycol and a modifier thereof, and a polyoxyethylene polyoxypropylene ether block copolymer; and the nano particles are nano-scale ZIF-8 (Zinc Induced Factor 8). The monatomic platinum nano antibacterial agent disclosed by the invention not only has good photothermal conversion capacity, but also has broad-spectrum active oxygen and free radical scavenging capacity, and due to the unique dual functions, the monatomic platinum nano antibacterial agent can efficiently kill drug-resistant bacteria, and meanwhile, inflammatory response is reduced by scavenging active oxygen to promote wound healing; and the antibacterial agent has good biological safety, and has a wide application prospect in treatment of wounds infected with drug-resistant bacteria.

The invention provides a nitrogen dioxide sensor as well as a preparation method and application thereof, and relates to the technical field of gas sensors. The nitrogen dioxide sensor provided by the invention comprises a silicon oxide substrate, a zinc oxide step arranged on the surface of the silicon oxide substrate, a conductive layer covering the top of the zinc oxide step and an interdigital electrode deposited on the surface of the conductive layer, a zinc oxide nanowire array modified by precious metal nano-particles grows on the side surface of the zinc oxide step, and the precious metal nano-particles comprise palladium and / or platinum nano-particles. According to the invention, the integration of the sensitive material (the precious metal nanoparticle modified zinc oxide nanowire array) is directly carried out on the silicon oxide substrate of the sensor chip, and the integrated sensor is provided, so that the consistency and reliability of the device are improved; and the constructed nitrogen dioxide sensor shows excellent nitrogen dioxide sensitive characteristics (high sensitivity, high selectivity and high stability).

Disclosed in the present application are an anode composite catalyst layer and a slurry thereof, a preparation method, and a membrane electrode. The anode composite catalyst layer is located between a proton exchange membrane and a gas diffusion layer of the membrane electrode, and comprises: an iridium catalyst layer, which has a first surface and a second surface which are opposite to each other, wherein the first surface faces the proton exchange membrane, and the second surface faces the gas diffusion layer, and the iridium catalyst layer comprises a first ionomer and an iridium catalyst dispersed in the first ionomer; and a platinum-conducting layer, which has a third surface and a fourth surface which are opposite to each other, wherein the third surface is in contact with the second surface of the iridium catalyst layer, and the fourth surface faces the gas diffusion layer, and the platinum-conducting layer comprises a second ionomer and platinum nano-particles which are dispersed in the second ionomer and have a particle size of 10-500 nm. The anode composite catalyst layer of the present application can endow the membrane electrode with a relatively low contact resistance and excellent stability.

[Problem] To provide a water electrolysis anode catalyst capable of reducing an increase in hydrogen concentration caused by cross leakage in the anode of a membrane electrode assembly of a water electrolysis apparatus. [Solution] The present invention pertains to a water electrolysis anode catalyst in which platinum fine particles are supported on a base catalyst having an oxygen evolution activity. A base catalyst of the present invention contains a metal or a metal compound that has a higher oxygen evolution activity than platinum. The platinum fine particles supported on the base catalyst have an average particle diameter of 1-55 nm. In the particle size distribution of the platinum fine particles supported on the base catalyst, the number-based cumulative 90% particle diameter is preferably 90 nm or less.