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Hydroxide IrNi@PdIr/C core-shell catalyst for alkaline anion exchange film fuse cell and application thereof

A technology of alkaline anion and core-shell catalysts, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of slow exchange current density and achieve good stability, good hydrogen oxidation catalytic activity and stability, high hydrogen oxidation The effect of catalytic activity

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although AAEMFC has the advantage of fast kinetics of the alkaline fuel cell (AFC) cathode oxygen reduction reaction (ORR), it has been found that under alkaline conditions, even noble metal platinum group catalysts can be used as electrocatalysts for the anode hydrogen oxidation reaction (HOR). , but its exchange current density is 2 orders of magnitude slower than that under acidic conditions

Method used

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  • Hydroxide IrNi@PdIr/C core-shell catalyst for alkaline anion exchange film fuse cell and application thereof
  • Hydroxide IrNi@PdIr/C core-shell catalyst for alkaline anion exchange film fuse cell and application thereof
  • Hydroxide IrNi@PdIr/C core-shell catalyst for alkaline anion exchange film fuse cell and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] preparation:

[0038] (1) Preparation of IrNi / C nanoparticles: take 0.1mM H 2 IrCl 6 , 0.3mM NiCl 2 , 102.4mg of XC-72 treated with 5M nitric acid reflux, 1mM trisodium citrate and 30ml ethylene glycol in a 100mL three-necked flask; stir ultrasonically for 30min; then add 2M NaOH aqueous solution drop by drop, adjust the pH to 9-12, and continue ultrasonic stirring And blow nitrogen for 15 minutes, then add excess 10% NaBH 4 Solution, reacted at 30°C for 3 hours, centrifuged, washed, and vacuum dried to prepare IrNi / C with a metal mass fraction of 15%, and the atomic ratio Ir:Ni=59:41;

[0039] (2) Preparation of IrNi@PdIr / C catalyst: Take 50 mg of IrNi / C prepared in (1) in a single-necked flask, then add 20 ml of a mixture of deionized water and isopropanol (volume ratio 1:1), and ultrasonically stir Each 30min, add excess 1mM / LPdCl 2 (HCl) aqueous solution was stirred and reacted for 1 h, placed in an oil bath at 40°C for 30 minutes, and subjected to centrifugal ...

Embodiment 2

[0041] preparation:

[0042] (1) Preparation of IrNi / C nanoparticles: take 0.1mM H 2 IrCl 6 , 0.2mM NiCl 2 , 102.4mg acid-treated XC-72, 1mM trisodium citrate, 30ml ethylene glycol in a 100mL three-neck flask; stir ultrasonically for 30min; then add 2M NaOH aqueous solution dropwise to adjust the pH to 9-12, continue ultrasonic stirring and pass Infuse nitrogen for 15 minutes, then add excess 10% NaBH 4 Solution, reacted at 30°C for 3 hours, centrifuged, washed, and vacuum dried to prepare IrNi / C with a metal mass fraction of 14.5%, and the atomic ratio Ir:Ni=63:37;

[0043] (2) Preparation of IrNi@PdIr / C catalyst: Take 50 mg of IrNi / C prepared in (1) in a single-necked flask, then add 20 ml of a mixture of deionized water and isopropanol (volume ratio 1:1), and ultrasonically stir Each 30min, add excess 1mM / LPdCl 2 (HCl) aqueous solution, control the reaction time to react for 60 minutes respectively, place it in an oil bath at 40°C for 30 minutes, and prepare 13.7% IrNi...

Embodiment 3

[0045] preparation:

[0046] (1) Preparation of IrNi / C nanoparticles: take 0.1mM H 2 IrCl 6 , 0.1mM NiCl 2 , 102.4mg acid-treated XC-72, 1mM sodium citrate and 30ml ethylene glycol in a 100mL three-neck flask; stir and ultrasonically 30min; then add 2M NaOH aqueous solution drop by drop, adjust the pH to 9-12, continue ultrasonic stirring and pass into Nitrogen for 15 min, then add excess NaBH 4 Solution, reacted at 30°C for 3 hours, centrifuged, washed, and vacuum dried to prepare IrNi / C with a metal mass fraction of 12.8%, and the atomic ratio Ir:Ni=63:37;

[0047] (2) Preparation of IrNi@PdIr / C catalyst: Take 50 mg of IrNi / C prepared in (1) in a single-necked flask, then add 20 ml of a mixture of deionized water and isopropanol (volume ratio 1:1), and ultrasonically stir Each 30min, add excess 1mM / LPdCl 2 (HCl) aqueous solution, control the reaction time to react for 60 minutes, place in an oil bath at 40°C for 30 minutes, and prepare the IrNi@PdIr / C catalyst with a ma...

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Abstract

The invention relates to a hydroxide IrNi@PdIr / C core-shell catalyst for an alkaline anion exchange film fuse cell and application thereof. The method specifically comprises a step of dissolving an appropriate amount of carbon carriers and a stabilizer in ethylene glycol with chloroantimonic acid and nickel chloride as metal precursor salts, ultrasonically stirring, adjusting pH to be alkaline byusing NaOH, introducing nitrogen gas for protection, adding an excess sodium borohydride reducing agent, and after reaction is completed, preparing IrNi nano particles with the average diameter of 2-4nm through centrifugation, washing and drying, and a step of weighing an appropriate amount of IrNi nanoparticles, placing the appropriate amount of IrNi nanoparticles into deionized water and isopropanol, mixing evenly, adding a PdCl2 solution, and after a replacement reaction for a period of time, obtaining IrNi@PdIr / C core-shell catalyst through centrifugal washing, vacuum drying and heat treatment under a hydrogen atmosphere. The particle size of the catalyst is distributed between 2 and 13 nanometers, and the catalyst is uniformly dispersed without agglomeration. The mass specific activity of the catalyst at 50mV overpotential is 1.78 times of that of commercial Pt / C, 3.06 times of that of Ir / C and 10.8 times of that of Pd / C, and the catalyst has an application value in the hydroxideof the anion exchange film fuel cell.

Description

technical field [0001] The invention relates to an alkaline anion exchange membrane fuel cell hydroxide IrNi@PdIr / C core-shell catalyst and its application. The preparation method of the catalyst involves two steps of preparing alloy core IrNi / C nanoparticles and preparing a PdIr alloy shell. The final product is IrNi@PdIr / C as a hydrogen oxidation electrocatalyst for alkaline anion exchange membrane fuel cells. 10.8 times. Background technique [0002] Alkaline anion exchange membrane fuel cell (AAEMFC) is a new type of polymer electrolyte membrane fuel cell. Compared with the proton exchange membrane fuel cell (PEMFC), it has the advantages of fast kinetics of the cathode oxygen reduction reaction (ORR) of the alkaline fuel cell (AFC), and the cathode is expected to fundamentally get rid of the dependence on the noble metal platinum; The anionic polymer electrolyte membrane overcomes the problems of liquid electrolyte KOH leakage and carbonation in AFC, and combines the ...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 俞红梅覃博文贾佳迟军高学强姚德伟秦晓平邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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