41results about How to "Lower adsorption energy" patented technology

The invention belongs to the field of catalytic materials, and relates to a graphene-wound molybdenum carbide / carbon microsphere electrocatalyst and its preparation method and its application in electrolyzing water to produce hydrogen under acidic conditions, comprising the following steps: Step 1: combining molybdate and oxidation Graphene is dissolved in water, and chitosan is dissolved in a mixed solvent of acetic acid and water, and then the two solutions are mixed and stirred at a certain speed; step 2: the mixed solution of step 1 is spray-dried, and then the solid powder is collected, and the High-temperature annealing treatment in an inert gas atmosphere to obtain a graphene-wrapped molybdenum carbide / carbon microsphere electrocatalyst. The graphene-wrapped molybdenum carbide / carbon microspheres prepared by the present invention have uniform size, uniform dispersion of molybdenum carbide nanoparticles, simple preparation process, convenient operation, strong controllability, and excellent electrochemical performance in electrolysis of water for hydrogen evolution. performance.

The invention relates to an electrocatalyst for a proton exchange membrane fuel cell, which is a catalyst that carries a hollow spherical binary platinum-based alloy on a carbon carrier, and the wall of the hollow sphere has holes through the wall; the nano-particles of the binary platinum-based alloy PtxMy The atomic ratio of x and y distribution is: x:y=10:1~1:1, the mass content of Pt in the supported catalyst is 10~40%; the second metal M is Pd, Fe, Ni or Cu. Compared with the prior art, the platinum-based alloy catalyst nanoparticles prepared by the present invention have good dispersion and uniform particle size; the structure and shape of the catalyst can be controlled by using a complexing agent and an etchant; the preparation method of the electrocatalyst is simple and reliable. Good controllability, aqueous phase reaction system and mild preparation conditions make this method not only save energy, but also reduce manufacturing cost, and it is easy to realize large-scale industrial application.

The invention belongs to the field of nanomaterial preparation and discloses a CeO 2 @MoS 2 / g‑C 3 N 4 Composite photocatalytic material and preparation method thereof, comprising: (1) adding cerium oxide hexahydrate to a mixed solution of butylamine and toluene, after hydrothermal treatment of the obtained mixed solution, calcining the reaction product to obtain CeO 2 Nanocrystal; (2) sodium molybdate dihydrate, g-C 3 N 4 The nanosheets were ultrasonically dispersed in a mixed solution of L-cysteine ​​and dimethyl sulfoxide, and the resulting mixed solution was hydrothermally treated to obtain MoS 2 / g‑C 3 N 4 Nanosheets; (3) CeO 2 Nanocrystals and MoS 2 / g‑C 3 N 4 Ultrasonic dispersion in methanol solution, after the methanol volatilizes, the resulting product is collected as CeO 2 ‑MoS 2 / g‑C 3 N 4 Composite material; (4) the CeO 2 ‑MoS 2 / g‑C 3 N 4 The composite material was placed in a tube furnace and calcined in a nitrogen atmosphere to obtain CeO 2 @MoS 2 / g‑C 3 N 4 Ternary composite photocatalyst. The preparation method of the invention is simple and highly controllable, and the obtained composite photocatalyst has excellent photocatalytic degradation performance.

The invention discloses a method for improving the dehydration properties of sludge. According to the method, a biosurfactant and a skeleton builder are used for combined regulation of original sludge. The biosurfactant and the skeleton builder are used for combined regulation so as to improve the dehydration properties of the sludge, so the dehydration properties of the sludge can be substantially improved, the water content of the sludge can be substantially reduced, and the purposes of sludge reduction and reduction in treatment cost can be achieved; the sludge treated by using the method is low in water content and in the content of poisonous and harmful substances and pathogens, and can be used for backfilling and composting or directly used for soil improvement, so a foundation is laid for subsequent treatment and utilization of sludge; and the method is of critical significance to stable, harmless and resourceful treatment of sludge.