Ultrafine bimetallic IrRu nanowire catalyst and preparation and application thereof

A nano-catalyst, bimetallic nano-technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of slow exchange current density, lack of high activity and high Stability, hindering AAEMFC anode to reduce precious metal loading and other issues, to achieve high hydrogen oxidation catalytic activity, good hydrogen oxidation catalytic activity and stability, good effect of stability

Active Publication Date: 2020-02-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
The pH effect of the anode catalyst seriously hinders the realization of the goal of reducing the loading of noble metals and using non-noble metal catalysts on the anode of AAEMFC. In addition, there is a lack of highly active and stable HER and OER catalysts in the alkaline water electrolysis cell, and the high cost of platinum seriously restricts the alkaline Commercialization of water electrolysis

Method used

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  • Ultrafine bimetallic IrRu nanowire catalyst and preparation and application thereof
  • Ultrafine bimetallic IrRu nanowire catalyst and preparation and application thereof
  • Ultrafine bimetallic IrRu nanowire catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] preparation:

[0026] (1) Preparation of IrRu nanowires: Take 1g of cetyltrimethylammonium bromide (CTAB), 20mL of n-hexane, and 10mL of n-hexanol in a 50mL three-neck flask in an oil bath at 40°C, stir for 30min, and then Add 0.05mM H 2 IrCl 6 , 0.05mM RuCl 3 aqueous solution, continue to stir for more than 3 hours, then add 5 mL of 2M NaBH 4 Fresh aqueous solution was reacted at 40°C for 12 hours to obtain a reaction slurry of IrRu nanowires, which was washed by centrifugation and vacuum dried to prepare IrRu nanowires with an Ir:Ru atomic ratio of 1:1.

[0027] (2) Preparation of IrRu NWs / C catalyst: Take the reaction slurry of IrRu nanowires prepared in (1), add 50 mg of XC-72, and stir for 12 hours. The IrRuNWs / C nanowire catalyst with a mass fraction of metal of 20% was prepared by centrifugal washing and vacuum drying.

[0028] Get the prepared IrRu NWs / C catalyst of step (2) among the appropriate example 1 and carry out powder XRD test, the result is as fol...

Embodiment 2

[0038] preparation:

[0039] (1) Preparation of IrRu nanowires: Take 1g of cetyltrimethylammonium bromide (CTAB), 20mL of n-hexane, and 10mL of n-hexanol in a 50mL three-neck flask in an oil bath at 40°C, stir for 30min, and then Add 0.05mM H 2 IrCl 6 , 0.05mM RuCl 3 aqueous solution, continue to stir for more than 3 hours, then add 5 mL of 2M NaBH 4 Fresh aqueous solution was reacted at 40°C for 12 hours to obtain a reaction slurry of IrRu nanowires, which was washed by centrifugation and vacuum dried to prepare IrRu nanowires with an Ir:Ru atomic ratio of 1:1.

[0040] (2) Preparation of IrRu NWs / C catalyst: Take the reaction slurry of IrRu nanowires prepared in (1), add 200 mg of XC-72, and stir for 12 hours. The IrRu NWs / C nanowire catalyst with a metal mass fraction of 5% and an Ir:Ru atomic ratio of 1:1 was prepared by centrifugal washing and vacuum drying.

Embodiment 3

[0042] preparation:

[0043] (1) Preparation of IrRu nanowires: Take 1g of cetyltrimethylammonium bromide (CTAB), 20mL of n-hexane, and 10mL of n-hexanol in a 50mL three-neck flask in an oil bath at 40°C, stir for 30min, and then Add 0.05mM H 2 IrCl 6 , 0.05mM RuCl 3 aqueous solution, continue to stir for more than 3 hours, then add 5 mL of 2M NaBH 4 Fresh aqueous solution was reacted at 40°C for 12 hours to obtain a reaction slurry of IrRu nanowires, which was washed by centrifugation and vacuum dried to prepare IrRu nanowires with an Ir:Ru atomic ratio of 1:1.

[0044] (2) Preparation of IrRu NWs / C catalyst: Take the reaction slurry of IrRu nanowires prepared in (1), add 5.5 mg of XC-72, and stir for 12 hours. The IrRu NWs / C nanowire catalyst with a metal mass fraction of 70% and an Ir:Ru atomic ratio of 1:1 was prepared by centrifugal washing and vacuum drying.

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Abstract

The invention relates to an ultrafine bimetallic IrRu nanowire catalyst and preparation and application thereof. According to specific steps, an ultrafine bimetallic IrRu nanowire is prepared, whereiniridium chloride and ruthenium chloride are used as metal precursor salt, a surfactant is added, the mixture is dissolved into an organic solvent, a reducing agent is added after stirring for a period of time, and after reacting for a period of time under a certain temperature, the non-loaded IrRu nanowire is prepared through the steps of centrifugation, washing and drying; then an appropriate amount of a reaction solution of the IrRu nanowire is taken, a carbon carrier is added, stirring is performed for a reaction for 12 hours, and the carbon-loaded nanowire catalyst is prepared through centrifugal washing and vacuum drying. A TEM test indicates that the diameter distribution of the nanowire is between 1 nanometer and 3 nanometers, and nanowires are in network connection with each otherwithout an obvious aggregation phenomenon. An LSV test indicates that the mass ratio activity under a 50mV overpotential is 4.2 times that of commercialized Pt / C. The catalyst has good application value in alkaline anion exchange membrane fuel cell hydroxide (HOR) and alkaline water electrolytic tank (HER / OER) electrocatalysis.

Description

technical field [0001] The invention relates to an ultrafine bimetallic IrRu nanowire catalyst material and its preparation method and its electrocatalysis in alkaline anion exchange membrane fuel cell (AAEMFC) hydrogen oxidation (HOR) and alkaline water electrolysis cell (HER / OER) The application belongs to the technical field of electrocatalysis of nanomaterials. 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 precious metal platinum; The anionic polymer electrolyte membrane overcomes the problems of liquid electrolyte KOH leakage and carbonation in AFC, and combines the advantages of both AFC and PEMFC. Therefore, AAEMFC has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/461H01M4/90
CPCB01J23/10C02F1/461H01M4/9083Y02E60/50
Inventor 俞红梅覃博文高学强姚德伟孙昕野秦晓平邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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