Improved magnesium-nickel-lanthanide series hydrogen storage electrode alloy graphene modification method

An electrode alloy and graphene technology, applied in the field of metal functional materials, can solve the problems of cycle capacity decline, poor kinetic performance, capacity loss, etc., and achieve the effects of improving cycle stability, improving overall performance, and improving discharge capacity.

Inactive Publication Date: 2017-05-10
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past 20 years, although magnesium-based hydrogen storage alloys have been extensively studied and developed extremely rapidly as electrode materials, their harsh hydrogen absorption and desorption conditions (high hydrogen absorption and desorption temperature, poor kinetic performance) and short electrode life ( Low corrosion resistance, etc.) and other shortcomings hinder its practical application
[0003] Many studies have shown that the decline of the cycle life of magnesium-based alloys is mainly due to the following two reasons: (1) The cycle capacity decline of magnesium-based hydrogen storage alloys is closely related to its corrosion in alkaline solution, especially as a hydrogen absorbing alloy. The corrosion of the element Mg and the corrosion of Ni as an element that improves the electrocatalytic activity are the main reasons for the continuous loss of capacity; (2) the powdering of the alloy particles caused by the expansion / shrinkage of the unit cell volume caused by the hydrogen absorption and desorption of the alloy

Method used

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  • Improved magnesium-nickel-lanthanide series hydrogen storage electrode alloy graphene modification method
  • Improved magnesium-nickel-lanthanide series hydrogen storage electrode alloy graphene modification method
  • Improved magnesium-nickel-lanthanide series hydrogen storage electrode alloy graphene modification method

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of amorphous electrode alloy: according to Mg 65 Ni 27 La 8 Chemical dosage ratio Weigh 100 grams of Mg, Ni, and La metal blocks with a purity greater than 99.5% (purity: 99.5%, purchased from Northwest Nonferrous Metals Research Institute) in a vacuum suspension melting furnace (type CXZGX-0.1, Shanghai Chenxin Electric Furnace Co., Ltd. Company) in repeated smelting, take the smelted metal and place it in the multifunctional amorphous synthesis equipment (LZK-12A type, copper roller surface line speed 0-78.5m / s, Shenyang multifunctional vacuum microcrystalline equipment manufacturing plant), adopt Preparation of Mg by melt rapid quenching method (quenching speed is 30m / s) 65 Ni 27 La 8 Amorphous electrode alloys.

[0037] (2) Preparation of Ag / graphene nanocomposite film: 200mg graphite oxide was added to 200ml distilled water, ultrasonic (KQ116 type, Kunshan Ultrasonic Instrument Co., Ltd.) was dispersed for 1 hour, then 20mg silver nitrate solid...

Embodiment 2

[0044] (1) The preparation of the amorphous electrode alloy is the same as in Example 1. The stoichiometric ratio of the amorphous electrode alloy prepared this time is (Mg 65 Ni 27 ) 95 La 5 alloy (quenching speed is 30m / s).

[0045] (2) The preparation of the Ag / graphene nanocomposite film is the same as in Example 1.

[0046] (3) The preparation and testing of the modified electrode are the same as in Example 1. As shown in Table 2, the surface-modified (Mg 65 Ni 27 ) 95 La 5 The maximum discharge capacity of the alloy is 557.6mAh / g, and the capacity retention rate is 76.84% after 50 cycles; while the unmodified (Mg 65 Ni 27 ) 95 La 5 The maximum discharge capacity of the alloy is 368.4mAh / g, and the capacity retention rate is 43.48% after 50 cycles. It can be found that the maximum discharge capacity is increased by 189.2mAh / g after surface modification of the alloy by this method; the capacity retention rate is increased by 33.36% after 50 cycles.

[0047] T...

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Abstract

The invention relates to a surface modification method for Mg-Ni-La series hydrogen storage electrode alloy, and belongs to the technical field of metallic functional materials. The method mainly comprises the following steps that a magnesium-nickel-lanthanide series, that is, Mg-Ni-La series amorphous alloy, a silver/graphene nano-composite film, tetrahydrofuran and cyclohexane are mixed so that surface modification treatment can be conducted on Mg-Ni-La series hydrogen storage electrode alloy, wherein the Mg-Ni-La series amorphous alloy is 0.8-1.5 grams, and 1 gram is preferred; the silver/graphene nano-composite film is 0.3-0.7 gram, and 0.5 gram is preferred; the tetrahydrofuran is 1-1.5 ml; and the cyclohexane is 1-2 ml. The Mg-Ni-La series hydrogen storage electrode alloy treated through the surface modification method has the characteristics of being high in electrochemical capacity, good in discharging stability and the like.

Description

technical field [0001] The invention relates to a surface modification method of a Mg-Ni-La series hydrogen storage electrode alloy, belonging to the technical field of metal functional materials. Background technique [0002] Facing the increasingly urgent development of new energy sources and environmental protection, magnesium-based electrode alloys are one of the most potential lightweight green energy materials. The theoretical hydrogen storage capacity of magnesium-based hydrogen storage alloy is as high as 7.6%, and the electrochemical capacity is up to 1000mAh g -1 , has the advantages of large hydrogen storage capacity, low density, rich content and low price. In the past 20 years, although magnesium-based hydrogen storage alloys have been extensively studied and developed extremely rapidly as electrode materials, their harsh hydrogen absorption and desorption conditions (high hydrogen absorption and desorption temperature, poor kinetic performance) and short elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C22C45/00
CPCB22F9/24C22C45/005
Inventor 黄林军王彦欣唐建国王瑶刘继宪
Owner QINGDAO UNIV
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