41 results about "In situ chemical reduction" patented technology

The present invention relates to a preparation method of Pt / CNT electrode catalyst carried by carbon nano tube. It is characterized by that the carbon nano tube can be used as carrier, a light-catalyzed in-situ chemical reduction precipitation method is utilized, and the ethylalcohol (or formaldehyde) can be used as reduction agent, and the chloroplatinic acid can be reduced and deposited on the activated carbon nano tube so as to obtain the invented Pt / CNTs catalyst with high activity for proton, exchange membrane fuel cell direct methyl alcohol fuel cell. As compared with existent electrode catalyst said invention features large specific surface area, high porosity, good dispersion property and low platinum use level.

The invention discloses a preparation method and an application of a Cd / CdS heterojunction visible light photocatalyst rich in sulfur vacancies. The method comprises the following steps: synthesizingan intermediate CdO / CdS composite material through a thermal treatment technology by using CdS prepared by a solvothermal technology as a precursor, and performing an in-situ chemical reduction technology by using sodium borohydride to directly obtain the Cd / CdS heterojunction visible light photocatalyst. The prepared Cd / CdS composite visible light photocatalyst contains a lot of sulfur vacancies,so the absorption and the utilization of visible lights by the catalyst are greatly improved, and the contact between highly-conductive Cd and CdS is close, thereby the photogenerated electrons can be well separated from holes, and the photocatalytic efficiency is high. The heterojunction photocatalyst has a high stability, has an excellent photocatalytic activity under the irradiation of visiblelights, and can be used for catalyzing photodegradation of water to produce hydrogen. The preparation method has the advantages of low requirements of preparation conditions, simplicity in operation,cheap and easily available raw materials, environmental protection, high visible light catalysis efficiency, and broad application prospect in the photocatalysis field.

The invention provides a method for preparing a macromolecular material / graphene nanometer composite material by adopting continuous mixing in-situ reduction as well as the application thereof, and relates to the technical fields of a macromolecular material / graphene nanometer composite material and preparation thereof. The used equipment is water assisted melting and mixing extrusion equipment. The preparation method of the nanometer composite material comprises the following steps: pre-mixing a macromolecular material and a GO powder, adding the mixture into the water assisted melting and mixing extrusion equipment to perform mixing extrusion, dissolving a green and non-toxic chemical reducing agent into water to obtain a chemical reducing agent aqueous solution, injecting the obtained solution into macromolecular material melt in an extruding machine by virtue of a metering pump to perform mixing, adding water to promote stripping and dispersing of GO, in-situ chemical reduction andin-situ thermal reduction, and finally preparing a macromolecular material / reduced graphene oxide (RGO) nanometer composite material. In the nanometer composite material prepared by the method, the striping and dispersing of the RGO are good and the reduction degree is high; furthermore, the nanometer composite material has a relatively good dielectric property and mechanical property.