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Gold-iridium bifunctional oxygen electrode catalyst, preparation method and applications thereof

A catalyst and dual-function technology, applied in the field of electrocatalyst, can solve the problems of poor activity, scarce reserves, high price, etc., and achieve the effects of accelerating the industrialization process, benefiting environmental protection, and simple and easy preparation process

Active Publication Date: 2015-01-07
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

[0005] However, the above-mentioned catalysts all use precious metal Pt, which is scarce in reserves and expensive.
In recent years, some oxides have been used as bifunctional catalysts, such as manganese oxide (Energy Environ.Sci.7 (2014) 2017), lanthanum nickelate (Nano Lett.12 (2012) 1946), etc., but their activity is poor

Method used

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  • Gold-iridium bifunctional oxygen electrode catalyst, preparation method and applications thereof
  • Gold-iridium bifunctional oxygen electrode catalyst, preparation method and applications thereof
  • Gold-iridium bifunctional oxygen electrode catalyst, preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Add 2.789 mL of 10 mg / mL chloroauric acid aqueous solution and 1.787 mL of 10 mg / mL chloroiridic acid aqueous solution to a three-necked flask containing 100 mL of deionized water and stir evenly, then add 300 mg of hexadecyltrimethyl bromide Ammonium chloride was mixed evenly to obtain a catalyst precursor slurry; the three-necked flask was placed in a 0°C water bath, and nitrogen was used as a protective gas, and 50 mL of sodium borohydride solution that was 1 mg / mL was added to the obtained catalyst precursor slurry to react. After 30 minutes, 80 mg of Vulcan XC-72R was added, and the resulting solution was filtered to obtain a black paste substance; washed with deionized water, and vacuum-dried to obtain a gold-iridium bifunctional oxygen electrode catalyst. The mass content of Au in the catalyst is 13.33%, and the mass content of Ir is 6.67%.

Embodiment 2

[0038] Add 2.091 mL of 10 mg / mL chloroauric acid aqueous solution and 2.680 mL of 10 mg / mL chloroiridic acid aqueous solution to a three-necked flask containing 100 mL of deionized water and stir evenly, then add 300 mg of hexadecyltrimethyl chloride Mix ammonium chloride evenly to obtain a catalyst precursor slurry; place the three-necked flask in a 30°C water bath, and pass argon as a protective gas, and add 25mL of potassium borohydride solution with a concentration of 4.5mg / mL to the obtained catalyst precursor slurry , reacted for 3 hours, and added 80 mg Vulcan XC-72R, and the resulting solution was filtered to obtain a black paste substance; washed with deionized water, and vacuum-dried to obtain a gold-iridium bifunctional oxygen electrode catalyst. The mass content of Au in the catalyst is 10%, and the mass content of Ir is 10%.

Embodiment 3

[0040] Add 1.394mL of 10mg / mL chloroauric acid aqueous solution and 3.573mL of 10mg / mL chloroiridic acid aqueous solution to a three-necked flask filled with 100mL of deionized water and stir evenly, then add 470mg of tetradecyl trimethyl bromide Ammonium chloride was mixed evenly to obtain a catalyst precursor slurry; the three-necked flask was placed in a 70°C water bath, and helium was used as a protective gas, and 25 mL of formaldehyde solution with a concentration of 3.5 mg / mL was added to the obtained catalyst precursor slurry to react. After 12 hours, 80mg of Black Pearls-2000 was added, and the resulting solution was filtered to obtain a black paste substance; washed with deionized water, and vacuum-dried to obtain a gold-iridium bifunctional oxygen electrode catalyst. The mass content of Au in the catalyst is 6.67%, and the mass content of Ir is 13.33%.

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Abstract

The invention discloses a gold-iridium bifunctional oxygen electrode catalyst, a preparation method and applications thereof. The Au accounts for 5% to 95% of the total weight of the catalyst, and the Ir accounts for 5% to 95% of the total weight of the catalyst. Compared to the conventional bifunctional oxygen electrode catalysts, the catalyst has high activity in the oxygen reduction reaction and oxygen evolution reaction; moreover, the money metal (gold) with large reserves replaces the pricy precious metals (Pt, Ru, Ir, etc.) with scarce reserves, the loading amount of precious metals is greatly reduced, and thus the cost is reduced. Moreover, the preparation process of the gold-iridium bifunctional oxygen electrode catalyst is simple, no toxic substance exists during the preparation process, and the preparation method is safe and pollution-free, and can be easily applied to massive production. The provided catalyst can be used as the renewable alkaline fuel cell bifunctional oxygen electrode catalyst, alkaline negative ion exchange membrane fuel cell oxygen reduction catalyst, and oxygen reduction reaction or oxygen evolution reaction catalyst under other alkaline conditions.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysts, and in particular relates to a catalyst for oxygen reduction or oxygen evolution reaction used in renewable alkaline fuel cells, alkaline anion exchange membrane fuel cells, and other alkaline conditions; the present invention also relates to The preparation method of above-mentioned catalyst. Background technique [0002] Regenerative Fuel Cell (RFC) is a rechargeable battery that combines water electrolysis (WE) technology with fuel cell (FC) technology. An integrated renewable fuel cell (URFC) electrode catalyst must satisfy the dual-effect functions of fuel cell (FC) and water electrolysis at the same time. [0003] Pt vs H 2 Oxidation and H 2 The precipitation has a very good catalytic effect, even at a relatively large current density, the overpotential is very low. It can be said that the URFC hydrogen electrode already has a better solution. The polarization of fuel cells an...

Claims

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Application Information

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IPC IPC(8): B01J23/52H01M4/92
CPCY02E60/50
Inventor 孙公权袁丽只姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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