35 results about "Desorption kinetics" patented technology

A heated DESI spray device provides improved resolution or control of analyte desorption at a target locus on a sample. Heating controls spot size and enhances resolution in an imaging mode without impairing signal level. Additionally or alternatively the heated DESI spray may control desorption kinetics of a target analyte or otherwise control analyte discrimination in detection mode. One embodiment of the DESI spray is heated by heating nebulizing gas that accompanies the electrosprayed solvent. Another embodiment heats a separate gas stream that transports or directs desorbed material to the ion aperture of an analysis instrument. Heating may reduce size of primary droplets, alter the impact dynamics or the energy delivered by the spray to the surface, reduce size of secondary droplets and / or assure desolvation, improve species selectivity or otherwise affect sampling and enhance the ion signal level.

A hydrogen storage material having improved hydrogen absorbtion and desorption kinetics is provided by adding graphite to a complex hydride such as a metal-doped alanate, i.e., NaAlH4. The incorporation of graphite into the complex hydride significantly enhances the rate of hydrogen absorbtion and desorption and lowers the desorption temperature needed to release stored hydrogen.

The invention discloses a V-Ti-Ni-based porous hydrogen evolution cathode material, a preparation method and its application. The V-Ti-Ni-based hydrogen storage alloy powder is used as a raw material to prepare a hydrogen evolution cathode matrix by a solid-phase sintering method, and then the It is modified by coating to obtain the final hydrogen evolution cathode material, which is used as the cathode material in water electrolysis hydrogen production. On the one hand, the substrate itself is porous and has a large surface area, which can provide more reaction interfaces for the hydrogen evolution process of the electrode, making the reaction easier to proceed. The Ni-based alloy coating with high catalytic activity can be modified on the porous substrate to further reduce the activation energy of the reaction. Reduce the hydrogen evolution point and energy consumption; on the other hand, the matrix has a large hydrogen storage capacity and good hydrogen absorption and desorption kinetics at room temperature. During normal electrolytic hydrogen production, it can absorb part of the hydrogen into the alloy. When the power is turned off, the absorbed hydrogen It can migrate to the surface of the electrode through diffusion, and replace the electrode components for oxidation reaction, thereby protecting the electrode material.

The invention discloses a Ti-Mn-based porous hydrogen-evolving cathode material, a preparation method and an application thereof. The Ti-Mn-based hydrogen-storage alloy powder is used as a raw material, and a hydrogen-evolving cathode substrate is prepared by a solid-phase sintering method, and then coated and modified. , to obtain the final hydrogen evolution cathode material, as the cathode material in water electrolysis hydrogen production. On the one hand, the substrate itself is porous and has a large surface area, which can provide more reaction interfaces for the hydrogen evolution process of the electrode, making the reaction easier to proceed. The Ni-based alloy coating with high catalytic activity can be modified on the porous substrate to further reduce the activation energy of the reaction. Reduce the hydrogen evolution point and energy consumption; on the other hand, the matrix has a large hydrogen storage capacity and good hydrogen absorption and desorption kinetics at room temperature. During normal electrolytic hydrogen production, it can absorb part of the hydrogen into the alloy. When the power is turned off, the absorbed hydrogen It can migrate to the surface of the electrode through diffusion, and replace the electrode components for oxidation reaction, thereby protecting the electrode material.

The invention relates to a high-performance double rare earth solid solution-based hydrogen storage alloy and a preparation method thereof. The hydrogen storage alloy includes a fair component of Mg 90‑a‑b RE1 a RE2 b alloy, and RE1 and RE2 are respectively a kind of lanthanide rare earth elements. The preparation method is to use medium frequency induction smelting technology to heat and smelt under the protection of inert gas, inject the molten alloy into a copper mold, and obtain a cylindrical alloy ingot after cooling, then mechanically crush and grind the ingot into a powder with a particle size of 200 meshes, and Add stearic acid as an additive in a mass ratio of cwt.%, then carry out high-energy ball milling, and then fully hydrogenate under a high-purity hydrogen atmosphere, MgH 2 / Mg-(EE1,RE2)H 2+x Composite material, the present invention is nano crystal grain, and is dispersed in Mg / MgH 2 In the matrix, it not only plays the catalytic role of the dihydrogen pump, but also provides a large number of nucleation active sites, grain boundaries and diffusion channels, which improves the hydrogen storage performance. The high hydrogen storage capacity and fast hydrogen absorption and desorption kinetics are maintained; the hydrogen desorption temperature of the hydride is significantly reduced, and the stability of the hydrogen absorption and desorption cycle is significantly improved.