10results about How to "Improve oxygen evolution performance" patented technology

The invention belongs to the technical field of electrolyzed water catalysts, and discloses a bifunctional heterojunction catalyst, a preparation method and application of the bifunctional heterojunction catalyst in electrolyzed water, the catalyst is characterized in that NiMoO4 nanosheets which grow on a foamed nickel conductive substrate in situ and have a clear heterogeneous interface structure coat Co3O4 nanowires to form a Co3O4 nanowire-coated NiMoO4 nanosheet array which is recorded as NiMoO4-coated Co3O4 / NF catalyst, and the NiMoO4-coated Co3O4 / NF catalyst is used for preparing the catalyst. The overall appearance of the catalyst is in the shape of a porous and wrinkled paper embroidered ball, and the heterogeneous interface structure of the catalyst enables the catalyst to have excellent OER / HER bifunctional catalytic activity under the alkaline condition. Through cooperation of a heterogeneous interface and a three-dimensional porous structure, the efficient hydrogen evolution and oxygen evolution activity is achieved in the water electrolysis process; the assembled full-battery electrolyzed water system can be subjected to overall water decomposition under low voltage, the performance is almost not attenuated under long-time operation, conversion and utilization of resources and energy are achieved, and the application prospect is wide.

The invention discloses a preparation method and application of a Gd-doped rutile type ruthenium dioxide nanosheet, and the Gd-doped rutile type ruthenium dioxide nanosheet is successfully prepared by taking RuCl3 and GdN3O9 as raw materials and adopting a salt template method. When being used as an oxygen evolution catalyst for producing hydrogen by electrolyzing water, the oxygen evolution catalyst shows excellent (OER) oxygen evolution performance, realizes the overpotential of 230mV under the current density of 10mA cm <-2 >, and has excellent conductivity, wider potential window and high redox reversibility, thereby having a wide application prospect in the field of electrocatalysis. In addition, the preparation method disclosed by the invention has the characteristics of simple process steps, safety, easiness in control, easiness in obtaining raw materials, few chemical reagents used in the whole preparation process, small environmental pollution, mild experimental conditions, relatively short time consumption, low cost and the like, so that the preparation method is suitable for industrial popularization and application.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a RuO2 / Co3O4-coated NC bifunctional electro-catalysis material and a preparation method and application thereof.The electro-catalysis material is of a heterostructure formed by taking carbon cloth as a substrate and loading a nitrogen-doped carbon shell layer on the surface to wrap Co3O4 and RuO2. Meanwhile, the invention also provides a preparation method of the electro-catalytic material and application of the electro-catalytic material in electro-catalytic full-hydrolysis of water. According to the obtained RuO2 / Co3O4-coated NC bifunctional electrocatalyst, the electrocatalytic hydrogen evolution and oxygen evolution performance of a composite material can be improved, and the long-time operation stability of hydrogen evolution and oxygen evolution can also be improved.

The invention discloses an iridium-zinc ultrathin nanosheet material. The thickness of a nanosheet of the iridium-zinc ultrathin nanosheet material is 5-20 nm; the atomic number ratio of Zn to Ir in the iridium-zinc ultrathin nanosheet material is (11.5-4.9): 1; the material has a rich crystalline / amorphous phase heterogeneous interface. The invention also discloses a simple preparation method of the iridium-zinc ultrathin nanosheet and application of the iridium-zinc ultrathin nanosheet in an oxygen evolution electrode material. The performance of the iridium-zinc ultrathin nanosheet material is superior to that of a commercial precious metal iridium oxide material.

The invention relates to the technical field of electrochemistry, in particular to a ruthenium / nickel-iron alloy co-embedded carbon fiber material and a preparation method and application thereof. The ruthenium / nickel-iron alloy co-embedded carbon fiber material catalyst is prepared through an electrostatic spinning-carbonization-reduction method, firstly, nanofibers are obtained through electrostatic spinning, active substances can be embedded into the carbon nanofibers through the electrostatic spinning technology, agglomeration of nanoparticles is effectively inhibited, meanwhile, corrosion resistance is improved, and the catalyst is used for preparing the carbon fiber material. The preparation method comprises the following steps: firstly preparing carbon nanofibers, then performing high-temperature carbonization to obtain Ni3Fe-CNFs, enabling the carbon nanofibers to have good electrical conductivity, facilitating electron transfer and charge transfer, and finally loading Ru onto the surfaces of the carbon nanofibers by adopting a sodium borohydride reduction method, so that the HER reaction process is greatly accelerated.

This invention discloses a Fe5Ni4S 8‑x O x This paper describes the preparation method and application of electrocatalysts, belonging to the fields of materials and electrocatalysis technology. The method involves first synthesizing a nickel-iron-based metal-organic framework (FeNi-MOF) via a hydrothermal method, then adding a sulfur source to hydrothermally synthesize oxygen-doped nickel pyrite (FeNi-MOF-S), and finally annealing at high temperature to generate Fe5Ni4S. 8‑x O x Electrocatalyst. Compared with the traditional high-temperature solid-state synthesis of pyrite, this method is simpler to operate and less expensive. The electrocatalyst prepared by this method has oxygen atoms directionally incorporated into the pyrite lattice, inducing changes in the electronic modes of the metal center and Ni / FeOOH lattice distortion, resulting in excellent oxygen evolution performance and significantly improved catalytic activity and stability. After being assembled into anion exchange membranes for water electrolysis, it also exhibits high activity and long-term stability. This catalyst reduces costs and energy consumption, significantly lowering costs and making it suitable for large-scale renewable energy hydrogen production, thus suitable for industrial production.

The invention discloses an anode oxygen evolution catalytic material for water electrolysis hydrogen production as well as a preparation method and application of the anode oxygen evolution catalytic material, and belongs to the field of composite materials and catalysts. The catalytic material comprises a quaternary metal compound, wherein the quaternary metal compound at least comprises nickel, iron, cobalt and tungsten; in the quaternary metal compound, the molar ratio of tungsten to cobalt is (1-3): (1-8); the molar ratio of cobalt to the sum of iron and nickel is (10-5): (8-1). The synergistic effect of quaternary transition metals in the catalytic material increases the electrochemical active area of the catalytic material, the water electrolysis oxygen evolution activity of the catalytic material is greatly improved, and the generation of an amorphous structure is also beneficial to the exposure of active sites of the catalyst. The catalytic material is synthesized by adopting a reflux etching method, the preparation method is simple, reaction conditions are easy to control, the cost is low, the nano catalytic material with uniform morphology and excellent performance can be obtained, and the nano catalytic material is used for preparing hydrogen energy by electrolyzing water and can remarkably reduce the overpotential of an anode in the water electrolyzing process.

The application belongs to the technical field of catalysts, and provides an iridium-based supported catalyst and a preparation method thereof, a proton exchange membrane water electrolysis membrane electrode, and application of the iridium-based catalyst. The preparation method comprises the following steps: taking titanium dioxide as a carrier, performing a hydrolysis reaction on an iridium precursor and an alkaline substance, performing an oxidation reaction on a hydrolysis reaction product and hydrogen peroxide, and obtaining a precursor of the iridium-based supported catalyst; and performing calcination treatment on the precursor of the iridium-based supported catalyst in an oxygen atmosphere to obtain the iridium-based supported catalyst IrO x @TiO2, wherein x = 1-2, IrO x The catalyst is coated on the surface of a TiO2 core as a shell layer. The oxides of the catalyst iridium uniformly form a shell structure on the surface of the titanium dioxide, effectively increase the catalytic performance and reduce the iridium loading, and the iridium-based catalyst IrO x @TiO2 has excellent electrolysis performance in a PEM water electrolysis membrane electrode.

The present invention relates to a catalyst for oxygen evolution by electrolysis of water, a preparation method thereof, and an alkaline water electrolysis hydrogen production device. The catalyst for oxygen evolution by electrolysis of water is a spherical catalyst containing nickel and iron, and the surface of the spherical catalyst has a porous structure with nanoscale pores, wherein the molar ratio of nickel to iron is 1:(0.1-0.5). The preparation method of the catalyst for oxygen evolution by electrolysis of water comprises: dissolving a nickel precursor and an iron precursor in a solvent, adding a spherical template, a surfactant and a precipitant, then performing a hydrothermal reaction, separating a solid phase product and sintering; the spherical template is a polystyrene microsphere and / or an inorganic carbon microsphere. The catalyst for oxygen evolution by electrolysis of water of the present invention is hollow spherical and has a porous structure on the surface. The catalyst has a large specific surface area and high catalytic activity, and the current density and oxygen evolution performance of the electrolytic cell are significantly improved.

This invention relates to a method for preparing and applying a self-supporting amorphous metal-coated nickel pyrite electrode, belonging to the field of electrocatalytic materials technology. It employs a multi-scale synthesis strategy to grow a nickel-iron metal-organic framework in situ on a nickel-iron foam substrate, followed by chemical vapor deposition (CVD). This process successfully constructs a self-supporting nickel pyrite electrode covered with an amorphous layer rich in metal clusters. This unique crystalline-amorphous integrated system forms a synergistic structure consisting of a stable conductive core, a dynamically active shell, and an interfacial strain region. The amorphous region exposes more highly active sites and serves as an ideal reconstruction precursor, thereby accelerating the formation of the active phase. Simultaneously, the crystalline core acts as a stable conductive framework, providing mechanical support and efficient electron injection for the surface active layer, kinetically limiting the reconstruction depth. This dual function prevents excessive oxidative dissolution of the catalyst, achieving a dual breakthrough in dynamic stability and catalytic performance.