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Preparation method of Ag-modified La-Mg-Ni type hydrogen storage alloy and application of Ag-modified La-Mg-Ni type hydrogen storage alloy as DBFC anode catalyst

A technology of hydrogen storage alloy and preparation method, which is applied in the direction of battery electrodes, liquid chemical plating, metal material coating technology, etc., can solve the problem of low catalytic activity, avoid inert electrodes, avoid the introduction of impurities, and be easy to operate Effect

Active Publication Date: 2021-09-17
INNER MONGOLIA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with noble metals, the catalytic activity of hydrogen storage alloy catalysts is relatively low, mainly because the surface of hydrogen storage alloys is easily oxidized in alkaline electrolytes, and it is easy to form inert electrodes.

Method used

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  • Preparation method of Ag-modified La-Mg-Ni type hydrogen storage alloy and application of Ag-modified La-Mg-Ni type hydrogen storage alloy as DBFC anode catalyst
  • Preparation method of Ag-modified La-Mg-Ni type hydrogen storage alloy and application of Ag-modified La-Mg-Ni type hydrogen storage alloy as DBFC anode catalyst
  • Preparation method of Ag-modified La-Mg-Ni type hydrogen storage alloy and application of Ag-modified La-Mg-Ni type hydrogen storage alloy as DBFC anode catalyst

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preparation example Construction

[0035] A kind of preparation method of Ag modified La-Mg-Ni type hydrogen storage alloy of the present invention comprises the following steps:

[0036] 1. Preparation of hydrogen storage alloy: rare earth metal La, metal Co, Mn, Al and intermediate alloy Mg 2.5 Ni is subjected to induction melting to prepare La-Mg-Ni type hydrogen storage alloy; in order to prevent the loss of Mg element during the melting process, 9% of the Mg content is calculated by excessive addition, and the temperature of the induction melting furnace is 660-1600 °C.

[0037] 2.PVP+AgNO 3 / Preparation of La-Mg-Ni mixture:

[0038] a. Preparation of polyvinyl alcohol (PVP) sol: Weigh an appropriate amount of PVP particles and add it to an appropriate amount of distilled water, stir to obtain a uniform PVP sol, seal it for use;

[0039] b. Preparation of AgNO 3 Solution: Weigh an appropriate amount of AgNO with a purity greater than 99.8% 3 Add the powder into distilled water to prepare AgNO with a con...

Embodiment 1

[0044] 1. According to the design, each element of the alloy is weighed according to the atomic ratio La: Mg: Ni: Co: Mn: Al = 0.85:0.15:2.485:0.525:0.28:0.21. In order to prevent the loss of Mg element during the smelting process, the excessive addition is calculated 9% of the Mg content; the above-mentioned weighed alloy raw materials were subjected to induction melting to prepare La 0.85 Mg 0.15 Ni 2.485 co 0.525 mn 0.28 Al 0.21 Hydrogen storage alloys.

[0045] 2. Weigh an appropriate amount of PVP particles and add it to an appropriate amount of distilled water, stir to obtain a uniform PVP sol, and seal it for use. Then, prepare AgNO3 solution. Weigh AgNO with a purity greater than 99.8% 3 Add the powder into distilled water to make a uniform silver nitrate solution with a concentration of 5.89mol / L, and transfer the solution into a brown bottle protected from light for later use. Finally, the Ag surface-modified La-Mg-Ni hydrogen storage alloy powder was prepare...

Embodiment 2

[0051] Example 2: Ag / La 0.775 Mg 0.225 Ni 2.485 co 0.525 mn 0.28 Al 0.21 ;

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Abstract

The invention relates to a preparation method of an Ag-modified La-Mg-Ni type hydrogen storage alloy and an application of the Ag-modified La-Mg-Ni type hydrogen storage alloy as an anode catalyst of a direct borohydride fuel cell (DBFC), and the Ag-modified La-Mg-Ni type hydrogen storage alloy is obtained by placing a prepared PVP + AgNO3 / La-Mg-Ni type hydrogen storage alloy mixture under an ultraviolet xenon lamp for irradiation. The alloy prepared by the method is used as an anode catalyst of a direct hydroboron fuel cell. The noble metal Ag is adopted for surface modification of the La-Mg-Ni hydrogen storage alloy, surface oxidation of the hydrogen storage alloy in the electrochemical reaction process can be effectively inhibited, and good catalytic performance is embodied; the target product Ag / La-Mg-Ni type hydrogen storage alloy powder is obtained by adopting an ultraviolet irradiation method; the method is simple and convenient to operate, time-saving and pollution-free, and compared with a conventional mechanical ball milling method, repeated vacuumizing and repeated gas flushing are not needed, so the preparation time is greatly shortened, and Fe impurities are also prevented from being mixed into the alloy powder; the direct hydroboron fuel cell prepared by taking the alloy as an anode catalyst can achieve better discharge voltage and relatively long discharge time.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a preparation method of an Ag-modified La-Mg-Ni type hydrogen storage alloy and its application as a direct borohydride fuel cell (DBFC) anode catalyst. Background technique [0002] With the increasing demand of human beings for energy, the development of new energy and new energy technology has attracted more and more attention. Direct Borohydride Fuel Cell (DBFC) uses alkaline solution of borohydride as fuel, O 2 / air / H 2 o 2 As an oxidant, oxidation and reduction reactions occur under the action of a catalyst, and BH 4 - A device that converts chemical energy directly into electrical energy under the action of an anode catalyst. The fuel used in the fuel cell—borohydride is a kind of compound with high hydrogen content, and the utilization of borohydride chemical energy is essentially the utilization of hydrogen energy. It can be seen that DBFC is a new energy t...

Claims

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Application Information

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IPC IPC(8): H01M4/90C23C18/14C23C18/08C22C1/03C22C30/00
CPCH01M4/9041C23C18/143C23C18/08C22C1/03C22C30/00Y02E60/50Y02E60/10
Inventor 田晓刘昕瑀那仁格日乐
Owner INNER MONGOLIA NORMAL UNIVERSITY
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