Low-temperature activated vanadium-based hydrogen storage alloy, and preparation method and application thereof

A low-temperature activation and hydrogen storage alloy technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of increasing raw material costs and processing troubles, reduce activation temperature, have broad application prospects, and facilitate large-scale promotion and use Effect

Active Publication Date: 2021-10-15
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the activation method can achieve direct activation at 25°C, it requires ball milling and mixing of hydrogen storage alloy materials and metal hydrides (such as aluminum hydride), which is not only cumbersome to handle, but also increases the cost of raw materials

Method used

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  • Low-temperature activated vanadium-based hydrogen storage alloy, and preparation method and application thereof
  • Low-temperature activated vanadium-based hydrogen storage alloy, and preparation method and application thereof
  • Low-temperature activated vanadium-based hydrogen storage alloy, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] This embodiment provides a low-temperature activation type vanadium-based hydrogen storage alloy, the elemental composition of the low-temperature activation type vanadium-based hydrogen storage alloy is Ti 0.05 Cr 0.15 V 0.8 Ce 0.02 ;

[0081] Prepared by the following preparation method:

[0082] (1) Dosing: Weigh elemental metals with a purity ≥ 99.9wt.% according to the atomic ratio and make dosing to obtain a mixture;

[0083] (2) Smelting: the mixture described in step (1) is put into the water-cooled copper mold of the non-consumable vacuum electric arc furnace, then put into the vacuum electric arc furnace and smelted under the protection of argon, the current in the smelting It is 200A, and the single smelting time is 150s. After a single smelting, the alloy is cooled to room temperature with the copper crucible, turned over, and then a new smelting is carried out, and the alloy ingot is obtained by repeated smelting 4 times;

[0084] Wherein, the alloy in...

Embodiment 2

[0089] This embodiment provides a low-temperature activation type vanadium-based hydrogen storage alloy, the elemental composition of the low-temperature activation type vanadium-based hydrogen storage alloy is Ti 0.05 Cr 0.15 V 0.8 Ce 0.01 , that is, modify “x=0.02” in Embodiment 1 to “x=0.01”, and other conditions are completely the same as Embodiment 1.

[0090] The XRD spectrum of the low-temperature activation type vanadium-based hydrogen storage alloy described in this embodiment is as follows figure 1 As shown, the alloy includes BCC phase and contains CeO 2 Components and VH 0.81 ;

[0091] Put the low-temperature activated vanadium-based hydrogen storage alloy described in this example into a stainless steel reaction vessel, and use the PCT hydrogen absorption and desorption test equipment to test the hydrogen absorption and desorption performance: under the condition of non-activation, at 8MPa H 2 And the first hydrogen absorption at room temperature 25°C, at 0...

Embodiment 3

[0093] This embodiment provides a low-temperature activation type vanadium-based hydrogen storage alloy, the elemental composition of the low-temperature activation type vanadium-based hydrogen storage alloy is Ti 0.05 Cr 0.15 V 0.8 Ce 0.05 , that is, modify “x=0.02” in Embodiment 1 to “x=0.05”, and other conditions are exactly the same as Embodiment 1.

[0094] The XRD spectrum of the low-temperature activation type vanadium-based hydrogen storage alloy described in this embodiment is as follows figure 1 As shown, the alloy includes BCC phase and contains CeO 2 Components and VH 0.81 ;

[0095] Put the low-temperature activated vanadium-based hydrogen storage alloy described in this example into a stainless steel reaction vessel, and use the PCT hydrogen absorption and desorption test equipment to test the hydrogen absorption and desorption performance: under the condition of non-activation, at 8MPa H 2 And the first hydrogen absorption at room temperature 25°C, at 0.1M...

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Abstract

The invention relates to a low-temperature activated vanadium-based hydrogen storage alloy, and a preparation method and application thereof. The element composition of the low-temperature activated vanadium-based hydrogen storage alloy is TiaCrbVcREx, wherein RE comprises one or a combination of at least two of La, Ce and Y; a is equal to 0.025 to 0.225; b is equal to 0.075 to 0.675; c is equal to 0.1 to 0.9; a+b+c is equal to 1; x is equal to 0.01-0.1; by adding the rare earth element RE and controlling the content of the rare earth element RE, the prepared vanadium-based hydrogen storage alloy can be directly activated at a low temperature on the basis of ensuring high hydrogen absorption amount and hydrogen desorption amount; a high-temperature or high-pressure activation process is not needed; and the preparation method has the characteristics of simplicity, rapidness and effectiveness.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage alloys, in particular to a low-temperature activated vanadium-based hydrogen storage alloy and its preparation method and application. Background technique [0002] Hydrogen energy has become the most ideal clean energy in the 21st century due to its advantages of high efficiency, pollution-free and renewable. However, there are still some technical barriers in the preparation, storage and application of hydrogen energy, among which the high cost of hydrogen energy storage in use restricts the development of the hydrogen energy industry. Solid-state hydrogen storage is one of the effective ways to reduce the cost of hydrogen storage, and it can become the most promising development direction for the hydrogen storage part of the hydrogen fuel cell industry. [0003] Among many hydrogen storage alloys, titanium-vanadium-based solid solutions have become one of the most promising high-capac...

Claims

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Application Information

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IPC IPC(8): C22C27/02C01B3/00C22C1/02
CPCC22C27/025C22C1/02C01B3/0052Y02E60/32
Inventor 陈庆军薛晓艺马传明
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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