7results about How to "Low hydrogen release temperature" patented technology

The invention relates to the technical field of solid hydrogen storage, and discloses an iron-based / graphene catalyst and a preparation method and application thereof, and the iron-based / graphene catalyst comprises a graphene carrier and a FeF2 / FeOX heterojunction loaded on the graphene carrier. The preparation method comprises the following steps: uniformly mixing FeF3. 3H2O, small molecular alcohol and graphene to obtain a precursor solution; the precursor solution is subjected to a hydrothermal reaction at 190-240 DEG C for 20-36 h, and the iron-based / graphene catalyst is obtained. The iron-based / graphene catalyst provided by the invention is a graphene-loaded FeF2 / FeOX heterojunction, has a rich interface, and can provide relatively high catalytic activity. According to the prepared composite hydrogen storage material, various uniform and stable catalysts including FeB, Fe2B and Li3BO3 are formed in situ in the first hydrogen desorption process, all the catalysts have a synergistic effect, the hydrogen desorption temperature of LiBH4 is reduced, the hydrogen desorption speed is increased, and good low-temperature dehydrogenation performance is shown; meanwhile, the reversible hydrogen storage performance of LiBH4 is effectively improved.

The invention provides a solid hydrogen storage material containing a transition metal alloy additive as well as a preparation method and application of the solid hydrogen storage material, and relates to the technical field of solid hydrogen storage materials. The solid hydrogen storage material comprises magnesium hydride and a transition metal alloy additive, wherein the transition metal alloy additive is a magnesium-nickel-yttrium alloy. The magnesium-nickel-yttrium alloy is added into magnesium hydride (MgH2) to serve as an additive, the hydrogen absorption / hydrogen desorption dynamic performance of MgH2 is effectively improved, the hydrogen absorption performance and the hydrogen desorption performance of MgH2 are improved, the solid hydrogen storage material has the lower hydrogen absorption and hydrogen desorption temperature, and the high final hydrogen desorption amount is obtained within a short time.

This invention relates to a high-capacity Mg-RE(Sm,Nd)-Ca-Cu-Zn hydrogen storage composite material catalyzed by K2TiF6+Nb2O5, belonging to the field of solid-state hydrogen storage materials technology. It solves one of the problems of existing magnesium-based hydrogen storage materials, namely, high thermodynamic stability, complex activation process, high hydrogen desorption temperature, and slow hydrogen absorption / desorption kinetics. This invention discloses a Mg-based solid-state composite hydrogen storage material, the composition of which is: Mg... 95‑x‑y Sm x Nd y Ca2Cu 3‑z Zn z +m wt.%(K2TiF6+Nb2O5), where x, y, and z are atomic ratios, and 0.5≤x≤2, 0.5≤y≤2, 0.2≤z≤3, m is the percentage of K2TiF6+Nb2O5 in the alloy, 4≤m≤10, the mass ratio of K2TiF6 to Nb2O5 is 1:1, the preferred atomic ratio is 1.5:1.5:0.8, m=6. This high-capacity Mg-RE(Sm,Nd)-Ca-Cu-Zn-based solid hydrogen storage composite material has high hydrogen absorption and desorption capacity and excellent hydrogen absorption and desorption kinetics; moreover, the preparation process is simple and easy to operate, suitable for large-scale preparation, and can be used as a hydrogen storage / hydrogen supply carrier in various scenarios.

The invention relates to the technical field of hydrogen storage material preparation, in particular to a method for preparing a Na-Al-H4 hydrogen storage material by using an aluminum alloy strip activated by a multi-metal catalyst. The invention provides a method for preparing a Na-Al-H4 hydrogen storage material by using an aluminum alloy strip activated by a multi-element metal catalyst, which comprises the following steps of: in an inert atmosphere, smelting an aluminum simple substance and the multi-element metal catalyst to obtain a multi-element aluminum alloy cast ingot, and then melting and rapidly quenching the multi-element aluminum alloy cast ingot to obtain a multi-element aluminum alloy strip; the multi-metal catalyst at least comprises elemental titanium and elemental cerium; and in a hydrogen-containing reducing atmosphere, the multi-element aluminum alloy strip and sodium hydride are subjected to ball milling and hydrogenation, and the Na-Al-H4 hydrogen storage material is obtained. According to the invention, titanium and cerium are used as multi-element metal catalysts, and the sodium aluminum hydrogen tetra-hydrogen storage material with excellent hydrogen storage / desorption performance and good cycle stability is obtained by utilizing the synergistic effect between titanium and cerium.

This invention discloses a composite catalyst for improving the hydrogen storage performance of magnesium hydride and its preparation method, belonging to the field of hydrogen storage materials technology. The catalyst is composed of Ni, NiOOH, and TiO2 nanocrystals, as well as amorphous carbon, with the amorphous carbon coating the surface of a Ni / NiOOH / TiO2 heterojunction matrix, forming a core-shell structure. Its preparation includes the following steps: First, nickel, titanium, and aluminum are melted into a nickel-titanium-aluminum alloy, and then subjected to corrosion activation treatment with sodium hydroxide solution to obtain porous nickel-titanium solid solution powder; then, the porous nickel-titanium solid solution powder is added to deionized water along with glucose and subjected to hydrothermal treatment; finally, the hydrothermal treatment product is filtered, washed, and dried to obtain the target product. Mechanically mixing the prepared Ni / NiOOH / TiO2@C catalyst with MgH2 can improve the hydrogen storage performance of MgH2. The composite catalyst provided by this invention has widely available raw materials and a simple preparation process; using it as a catalyst for hydrogen storage in MgH2 can significantly reduce the hydrogen desorption temperature of MgH2 and improve cycle stability.

The invention provides a hydrogen storage material and a preparation method thereof, the hydrogen storage material comprises MgH2 and fibrous VNbO5, and the length-diameter ratio of the fibrous VNbO5 is 5.0 * 10 < 4 >-1.15 * 10 < 5 >. In the hydrogen storage material, MgH2 and fibrous bimetallic oxide VNbO5 cooperate with each other, so that the hydrogen desorption kinetics of MgH2 is effectively improved, the hydrogen desorption temperature of magnesium hydride is reduced, the hydrogen desorption rate of MgH2 is increased, the hydrogen absorption kinetics of MgH2 is effectively improved, the hydrogen absorption rate of MgH2 is increased, and fibrous VNbO5 can form good contact with MgH2, so that the hydrogen storage material has good hydrogen desorption performance. The catalytic effect and the cycling stability of the hydrogen storage material are effectively improved.