2 results about "Bond rupture" patented technology

This invention belongs to the field of environmental functional materials technology, and provides a self-healing, regenerable photocatalytic coating for environmentally toxic substances and its preparation method. The invention uses fluorinated polyurethane as the continuous phase, introduces reversible bonding units, and constructs a dynamic polymer network with photothermal triggering self-healing capabilities. The coating is loaded with a heterojunction composed of nitrogen-doped carbon quantum dots and bismuth tungstate, and a silica shell inhibits catalyst surface poisoning and deactivation. Furthermore, titanium carbide-based two-dimensional materials are used as conductive and photothermal aids to effectively accelerate the separation and migration of photogenerated carriers, while simultaneously generating a mild localized temperature rise under illumination, promoting the reversible bond breaking and recombination in the polyurethane network, achieving in-situ self-healing of microcracks and photo-etching damage in the coating. Additionally, the coating surface is endowed with selective enrichment and self-cleaning capabilities. The coating of this invention can maintain stable adhesion and continuous catalytic activity under long-term illumination and complex pollution environments, and has a continuous degradation capability for environmentally toxic substances such as gaseous formaldehyde.

The application discloses an S-Pt@MoS2 hollow nano reactor and a preparation method and application thereof, and belongs to the technical field of inorganic nano materials. In view of the deficiency of the existing Pt-based catalyst in two-electron oxygen reduction (ORR) catalysis, the S-Pt@MoS2 hollow nano reactor for limiting Pt nanoparticles in MoS2 cavities is prepared through a'micelle limited Pt ion' strategy, the S-Pt@MoS2 hollow nano reactor has strong Pt-S coordination, can adjust and control the oxygen adsorption mode, inhibits the O-O bond breaking, and improves the selectivity of two-electron ORR. In addition, the shell isolation effect caused by the cavity limitation can avoid the aggregation and dissolution of the Pt active sites, and improve the stability of the catalyst. The application develops a material synthesis technology based on the micelle limited strategy for precisely controlling the spatial position of the active sites, realizes the effective regulation of the ORR reaction path from four electrons to two electrons, and provides a new idea for preparing an acid electro-synthesis hydrogen peroxide efficient and durable catalyst.