4results about How to "Improve oxygen evolution performance" patented technology

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 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.

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.