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Cathode catalyst active material for hydrogen fuel cell, preparation method and catalyst

A cathode catalyst and fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., to achieve the effects of improving activity, improving oxygen reduction activity, and improving utilization

Active Publication Date: 2021-10-08
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the reduction potentials of various elements are quite different in multi-component alloys, the synthesis method is also very challenging compared with the preparation method of binary alloy nanowires.

Method used

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  • Cathode catalyst active material for hydrogen fuel cell, preparation method and catalyst
  • Cathode catalyst active material for hydrogen fuel cell, preparation method and catalyst
  • Cathode catalyst active material for hydrogen fuel cell, preparation method and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 20.0mg Pt(acac) 2 , 10.0mg Ni(acac) 2 , 11.0mg Ga(acac) 3 , 2.4mg NH 4 ReO 4 , 75.0 mg of CTAB was poured into the reaction bottle, 4.0 mL of oleylamine was added thereto, and then ultrasonicated in an ultrasonic machine for 30 min to form a homogeneous system. Then weigh 20.0mg W(CO) 6 Add it into the homogeneous system formed after ultrasonication, tighten the bottle cap, and turn the reaction bottle to make W(CO) 6 Spread relatively evenly on the bottom of the reaction bottle, and finally transfer to an oil bath at 170°C to react for 2 hours. Afterwards, it was cooled to room temperature, centrifuged at 13000 rpm, and the sample of the separated solid part was washed 4 times with a mixed organic solvent of hexane and ethanol at a volume ratio of 2:1, and then dried under vacuum to obtain One-dimensional PtNiGaRe alloy nanowire materials.

[0021] figure 1 Transmission electron microscope (TEM) image of the one-dimensional PtNiGaRe quaternary alloy nanow...

Embodiment 2

[0024] Weigh 4.0 mg of the one-dimensional PtNiGaRe alloy nanowire material prepared in Example 1, dissolve it in 8 mL of chloroform solution, and ultrasonically treat it for 1 h, add the above uniformly dispersed solution dropwise to the ethanol solution containing 16 mg of carbon black and stir vigorously 30 min; centrifuge the resulting mixture at 10,000 rpm, wash the separated solid sample twice with hexane, redisperse it in acetic acid, and heat at 70°C for 12 h to remove the surface activity on the nanowire surface Afterwards, by centrifugation, the separated solid sample was washed 5 times with ethanol, and dried to obtain a carbon-supported one-dimensional PtNiGaRe alloy nanowire material catalyst (ie, PtNiGaRe / C nanocatalyst).

[0025] In order to compare the catalytic activity of the catalyst in this example, the PtNiGaRe / C nano-catalyst of Example 2 and the existing Pt / C catalyst were tested under the same test conditions, and the three-electric system was used to ca...

Embodiment 3

[0028] Weigh 5 mg of the PtNiGaRe / C nanocatalyst obtained in step 2 of Example 2 and mix it with 1.16 mL of isopropanol, 0.289 mL of deionized water and 0.054 mL of Nafion alcohol solution, and ultrasonicate for 1 hour to form a uniformly mixed catalyst ink solution. The above catalyst ink solution was sprayed on carbon paper, used as the cathode catalyst of the fuel cell membrane electrode assembly, and the fuel cell performance test of the one-dimensional PtNiGaRe alloy nanowire was carried out.

[0029] Continuously test the electrical performance of the above-mentioned fuel cell at a constant potential of 0.75V for 100h, the results are as follows Figure 5 shown. It can be seen from the figure that the attenuation of the output current density of the fuel cell using the PtNiGaRe / C nano-catalyst is almost negligible, and only drops by 4.9%, showing excellent stability.

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Abstract

The invention provides a cathode catalyst active material for a hydrogen fuel cell, a one-dimensional PtNiGaRe quaternary alloy nanowire formed by Pt, Ni, Ga and Re metal elements; and a one-dimensional PtNiGaRe quaternary alloy nanowire loaded on carbon A cathode catalyst for a hydrogen fuel cell can be obtained. Also provided is a preparation method of a quaternary alloy nanowire, which comprises dispersing Pt-containing salt, Ni-containing salt, Ga-containing salt, perrhenate and quaternary ammonium salt containing hexadecyltrimethyl molecular chain In oleylamine, ultrasonication forms a homogeneous system, and then adds W(CO) 6 Adding it into the above system at a certain temperature, reacting for a certain period of time, and then centrifuging and cleaning to obtain one-dimensional ultrafine PtNiGaRe nanowires. The quaternary one-dimensional alloy nanowire material of the present invention is a brand-new quaternary alloy catalytic system, which not only increases the utilization rate of platinum atoms on the surface, but also improves the activity and stability of the catalyst. The invention adopts the wet chemical method for the first time to synthesize the alloy nanowires of four metals in one step, not only the operation is simple, but also the reaction conditions are relatively mild, and the use of Pt can be greatly reduced.

Description

technical field [0001] The invention relates to a material and a preparation method for a hydrogen fuel cell, in particular to a cathode catalyst active material, a preparation method and a catalyst for a hydrogen fuel cell. Background technique [0002] Hydrogen fuel cell has unique technical advantages such as high energy conversion rate and zero emission, and has been recognized as a very promising clean energy conversion technology. Although hydrogen fuel cells have broad application prospects, it is necessary to load a large amount of noble metal Pt on the cathode to improve the reaction kinetics of the slow oxygen reduction reaction (ORR) and durability problems in practical applications, and its large-scale commercial application Still restricted. Therefore, how to reduce the loading of Pt and simultaneously improve the catalytic activity and stability of the catalyst is one of the focuses of current research. In response to the above problems, the researchers mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8825H01M4/9041H01M4/921Y02E60/50
Inventor 黄宏文高磊王雨
Owner HUNAN UNIV
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