4results about How to "Fast reaction kinetics" patented technology

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The invention provides a preparation method of an ultrathin porous CoFeMoO4-based nanosheet electrocatalyst and an application of the ultrathin porous CoFeMoO4-based nanosheet electrocatalyst in a photovoltaic-water electrolysis hydrogen production system. Through solvent heat treatment and surface engineering, the Fe element is introduced, and meanwhile, the ultrathin nanosheet catalyst with a mesoporous structure is constructed, so that the ultrathin nanosheet catalyst shows excellent oxygen evolution reaction activity and stability. Co and Fe elements in the catalyst have moderate adsorbability to oxygen evolution reaction intermediates, the specific surface area, the activity of active sites and the ion / electron transmission rate of the catalyst are improved through multiple strategies such as electronic engineering and structural engineering, and overpotential and energy loss are remarkably reduced. A photovoltaic system and a water electrolysis system are coupled, a commercial monocrystalline silicon thin film cell is used as the only energy input, and the catalyst realizes high solar energy-hydrogen energy conversion efficiency and stability. The technical synthesis steps are simple, no precious metal participates in, efficient and stable green hydrogen energy production is achieved, and clean fuel can be synchronously generated under the mild condition through solar energy driving.

This invention belongs to the field of alkaline hydrogen fuel cell catalyst preparation technology, specifically providing a fluorinated modified supported ruthenium-based fuel cell anode catalyst and its preparation method, to solve the problems of easy flooding, low stability, and limited hydrogen evolution / hydrogen oxidation (HOR) activity of existing ruthenium-based anode catalysts in alkaline media. In this invention, the active components of the anode catalyst are an oxide support and Ru nanoparticles supported on the support, and the oxide support is doped with fluoride ions through a fluorination process. This invention introduces a fluorine source (such as ammonium fluoride) during the reduction process of the metal oxide precursor for fluorination, utilizing the anion (fluoride ion) regulation effect at high temperature and the etching effect of HF to achieve precise modification of the catalyst. Ultimately, this invention not only significantly improves the HOR activity of the supported ruthenium-based fuel cell anode catalyst over a wide potential range, but also greatly enhances its long-term operational stability.

The invention relates to the technical field of catalysts, in particular to a cobalt-based phosphide nano catalytic material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a cobalt salt, urea and ammonium fluoride in water to obtain a mixed solution, placing a pretreated carbon cloth in the mixed solution, carrying out a hydrothermal reaction, taking out the carbon cloth to obtain a carbon cloth-loaded phosphating precursor, and carrying out hydrothermal reaction on the carbon cloth-loaded phosphating precursor in a protective atmosphere to obtain the carbon cloth-loaded phosphating precursor. Carrying out phosphating treatment with a phosphorus source; and carrying out constant piezoelectric deposition by taking the carbon cloth loaded cobalt phosphide as a working electrode and cobalt salt as an electrolyte to obtain the cobalt-based phosphide nano catalytic material. The cobalt-based phosphide nano catalytic material shows excellent catalytic activity, rapid reaction kinetics and good stability in HER, OER and full water splitting application, the preparation method is simple and controllable, the cobalt-based phosphide nano catalytic material is expected to replace a noble metal-based catalyst, and the cobalt-based phosphide nano catalytic material has a wide application prospect in the field of electro-catalysis energy conversion.