6results 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.

This invention relates to a Pt cluster-anchored amorphous-crystalline high-entropy spinel oxide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The Pt cluster-anchored amorphous-crystalline high-entropy spinel oxide catalyst is a Pt / AHESO / CHESO composite catalyst. In this catalyst, Pt exists as metallic Pt clusters, AHESO is an amorphous high-entropy spinel oxide, and CHESO is a crystalline high-entropy spinel oxide. This catalyst exhibits excellent catalytic activity in redox reactions (ORR) and oxygen evolution reactions (OER), demonstrating high oxygen electrocatalytic activity and stability. This invention's Pt cluster-anchored amorphous-crystalline high-entropy spinel oxide catalyst balances oxygen electrocatalytic activity and stability, providing a new method for promoting the stable and efficient operation of zinc-air batteries.

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 present invention relates to the technical field of aluminum-sulfur batteries, and in particular to a molten salt electrolyte and a preparation method thereof, a fast-chargeable aluminum-sulfur battery and its application. The molten salt electrolyte comprises a general formula A a AlX b A molten salt; wherein A is selected from at least one of Ca, Mg, Li, Na, K, Rb and Cs; X includes at least two different halogen elements; 0.1≤a≤1, 3.1≤b≤4. The present invention improves the disorder and asymmetry of the molten salt electrolyte by introducing at least two different types of halogen elements, reduces the bond breaking energy barrier of the aluminum-halogen covalent bond, and realizes the fast reaction kinetics of the molten salt electrolyte, thereby realizing the high capacity and fast charging performance of the aluminum-sulfur battery. In addition, the melting point of the molten salt electrolyte is low.

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.