313 results about "Hydrogen desorption" patented technology

One problem with a sealed type nickel-metal hydride battery is that the high-rate discharge capability is inferior to that of a nickel-cadmium storage battery, because of a slow transfer rate of charges to the surface of a hydrogen storing alloy that is a negative electrode. Another problem is that the use of an alloy having excellent life characteristics takes much time for initial activation of battery characteristics. The invention provides a solution to the aforesaid problems by the provision of a sealed type nickel-metal hydride battery (1) improved in high-rate discharge capability and charge-discharge cycle characteristics. To this end, the invention is characterized by locating a 50 nm to 400 nm thick nickel-rich layer (11) on the surface of a hydrogen storing alloy powder, and locating the nickel-rich layer (11) as well on the surface of cracks (12) that open at the surface of alloy, and more preferably setting the mass saturation magnetization of the alloy powder at 2.5 to 9 emu / g and the content of magnetic nickel at 0.5 to 1.9 mmol per gram of the hydrogen storing alloy powder. A succession of hydrogen absorption step, alkali treatment step, product removal step, hydrogen desorption step and partial oxidization step by air are applied to the hydrogen storing alloy powder to obtain alloy powder, which is then used to obtain a battery having the aforesaid features. The invention is effectively applied to corrosion-resistant hydrogen storing alloys containing Er, Y and Yb.

The invention discloses a metal hydride hydrogen storage device, which belongs to the technical field of hydrogen storage. The device is composed of a valve, a front cover, a gas path tube, a bottleneck connector, a clamping sleeve, a sealing gasket, a filter disc, a shell, two fans, a longitudinal heat transfer finned tube, a hydrogen storage container, a hydrogen storage material bed body, and a porous gas guide tube, wherein the bottleneck connector is connected with a hydrogen storage bottle body and the gas path tube by the sealing gasket and the clamping sleeve; the gas path tube is connected with the porous gas guide tube and the valve by the filter disc; the front cover and the two fans are arranged on the shell, and the longitudinal heat transfer finned tube and a hydrogen storage bottle are arranged in the shell; and the hydrogen storage material bed body and the porous gas guide tube are arranged in the hydrogen storage bottle body. The metal hydride hydrogen storage device disclosed by the invention is simple in structure, and easy to manufacture and process; and the longitudinal heat transfer finned tube can ensure the uniform heat transfer of the hydrogen storage container while the heat transfer efficiency of the hydrogen storage container is improved, so that the uniformity of hydrogen desorption of the hydrogen storage material bed body in the hydrogen storage container is ensured, and the hydrogen desorption performance is significantly improved.

An object of the invention is to provide an engine system driving an engine by using a hydrogen rich gas generated from a medium chemically repeating a hydrogen absorption and a hydrogen desorption as one of fuels, in which the engine system can efficiently generate a hydrogen rich gas from the medium. In an engine system which mounts a medium chemically repeating a hydrogen absorption and a hydrogen desorption thereon, is provided with a hydrogen supplying apparatus generating or storing a hydrogen rich gas from the medium, and drives an engine by using the hydrogen rich gas as one of fuels, the engine system has a detecting portion detecting an operating state of the engine, and a medium supplying amount control means controlling a supplying amount of the medium supplied to the hydrogen supplying apparatus in correspondence to a result of detection of the detecting portion.

The invention discloses a method for preparing a nanometer limited range magnesium-based hydrogen storage material. The nanometer limited range method belongs to the technical field of new energy materials. The method is characterized in that the hydrogen storage material is formed by loading magnesium hydride (MgH2) in nanopores of a mesoporous framework material. The method comprises the following steps: dipping dibutyl magnesium (MgBu2) and a mesoporous framework material, replacing MgBu2 with MgH2 loaded inside and outside the nanopores of the mesoporous framework material in a high-pressure reactor under high temperature and high pressure, washing MgH2 loaded outside the pores away by using pentane, drying, thereby obtaining the material. The nanometer limited range magnesium-based hydrogen storage material prepared by the method can release hydrogen at room temperature and has excellent properties in hydrogen absorption and desorption kinetics and hydrogen desorption thermodynamics. The method disclosed by the invention is easy to operate and high in synthesis speed and the prepared material is high in dispersity; therefore, the method has ideal application prospects.

A magnesium-based hydrogen storage material including magnesium or a magnesium-based hydrogen storage alloy and a hydrogen desorption catalyst which is insoluble in said magnesium-based hydrogen storage alloy and is in the form of: 1) discrete dispersed regions of catalytic material in the bulk of said magnesium or magnesium-based hydrogen storage alloy; 2) discrete dispersed regions on the surface of particles of said magnesium or magnesium-based hydrogen storage alloy; 3) a continuous or semi-continuous layer of catalytic material on the surface of said magnesium or magnesium-based hydrogen storage alloy which is in bulk or particulate form; or 4) combinations thereof. Methods of producing the material are also disclosed.

An onboard hydrogen storage unit with heat transfer system for a hydrogen powered vehicle. The system includes a hydrogen storage vessel containing a hydrogen storage alloy configured to receive a stream of hydrogen and provide hydrogen for use in powering a vehicle. During refueling a cooling / heating loop is used to remove the heat of hydride formation from the hydrogen storage alloy and during operation of the vehicle the heating / cooling loop is used to supply heat to the hydrogen storage alloy to aid in hydrogen desorption.

The invention discloses a nitrogen-doped porous carbon material loaded with CoB nanoparticles. A nitrogen-containing compound is added to a porous carbon material, and the irregular spherical nitrogen-doped porous carbon material is produced by a hydrothermal method, an activation method and a high-temperature heat treatment method; and then CoB is supported on the nitrogen-doped porous carbon material by an in-situ reduction method to obtain the nitrogen-doped porous carbon material loaded with CoB nanoparticles. CoB nanoparticles are uniformly supported on the surface and in pores of the irregular spherical nitrogen-doped porous carbon material, the final product is in a regular spherical shape finally, the specific surface area of the final product is 1359-2524 m<2> / g, and the pore sizedistribution of the final product is 1.60-2.40 nm. The preparation method comprises the following steps: 1) preparing a nitrogen-doped porous carbon material; and 2) supporting the CoB nanoparticles.The material serves as a sodium borohydride hydrolytic hydrogen-releasing catalyst, the hydrogen desorption rate reaches 1200-2500 ml / min*g, the cycle performance is good, and the hydrogen-releasingquantity is maintained at 50-60%. The material is simple to prepare, has more excellent catalytic performance, and has a wide application prospect in the fields of application of hydrogen energy, fuelcells and the like.

The invention relates to a polymer wrapped nano magnesium based hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage material preparation. The hydrogen storage material is prepared from the following components in percentage by weight: 80 to 98% of magnesium-nickel alloy, and 2 to 20% of polymer. Magnesium powder and nickel powder are taken as the raw materials and then are mixed and preprocessed; the mixture is hydrogenated, burned, and synthesized, and finally the product and polymers are fiercely and mechanically ball-milled to prepare the hydrogen storage material. The hydrogen storage material has excellent low temperature hydrogen absorption / desorption dynamics performances: at a temperature of 473K, the hydrogen absorption amount can reach 3.73 wt.% with 60 minutes; the hydrogen desorption amount can reach 1.02 wt.% within 120 minutes; at a temperature of 523 K, the hydrogen absorption amount is as high as 4.04 wt.% within 60 minutes, and the hydrogen desorption amount can reach 2.18 wt.% within 120 minutes. The hydrogen storage material can be used to store / transport hydrogen and prepare hydrogen fuel battery.

The invention discloses an automatic control hydrogen absorption and desorption system for a solid hydrogen storage material. The automatic control hydrogen absorption and desorption system comprisesa hydrogen filling pipe section, a hydrogen desorption pipe section and a stainless steel hydrogen storage tank. The stainless steel hydrogen storage tank comprises a stainless steel tank body and a tank body cover, and a plurality of metal baskets are arranged in the stainless steel tank body. A hydrogen filling hole and a hydrogen desorption hole are formed in the left end and the right end of the tank body cover respectively, and a temperature measuring hole is formed in the middle of the tank body cover. The hydrogen filling hole is connected with a hydrogen compressor through a hydrogen filling pipeline. The hydrogen desorption hole is connected with a hydrogen desorption pipeline. A thermocouple is inserted in the temperature measuring hole, and the lower part of the thermocouple extends into a central pipe. A heat preservation layer is arranged on the outer side of the stainless steel tank body, an electromagnetic heating coil is arranged in the heat preservation layer, and theheat preservation layer and the electromagnetic heating coil form an electromagnetic heating sleeve with a heat preservation function. The hydrogen compressor and the thermocouple are respectively connected with a computer control device. The automatic control hydrogen absorption and desorption system can achieve automatic control of temperature and hydrogen pressure, can be suitable for most solid hydrogen storage materials and has a wide application range.