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Preparation and application of a double-effect oxygen electrode catalyst with metal iridium surface-modified platinum

A double-effect oxygen electrode and catalyst technology, applied in the field of electrochemistry, can solve problems such as unfavorable catalytic reaction, unfavorable cleaning of catalysts, etc., and achieve the effects of improving oxygen reduction performance, easy control of reaction conditions, and sacrificing oxygen evolution activity.

Active Publication Date: 2020-09-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is not difficult to find out that above in the preparation method of metallic iridium or iridium oxide surface-modified platinum, known reductive reagents are all used, and some also use organic reagents as surfactants, which is unfavorable for later stage cleaning catalysts (surfactant adsorption on the surface of the catalyst will not be conducive to the catalytic reaction)

Method used

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  • Preparation and application of a double-effect oxygen electrode catalyst with metal iridium surface-modified platinum
  • Preparation and application of a double-effect oxygen electrode catalyst with metal iridium surface-modified platinum
  • Preparation and application of a double-effect oxygen electrode catalyst with metal iridium surface-modified platinum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Accurately weigh 19.25mg of iridium black (0.1mmol) into 100mL of deionized water, and ultrasonically disperse for 15min.

[0040] (2) Heat the above dispersion to 30°C, stir for 15 minutes and then 20ml K 2 PtCl 4(0.0001mol / L), so that the ratio of the amount of Pt to Ir is 0.02:1, and then stirred and reacted for 3h.

[0041] (3) After the reaction, it was naturally cooled to room temperature, then centrifuged, and then washed 4 times with a mixed solution of deionized water and ethanol to obtain a double-effect oxygen electrode catalyst.

Embodiment 2

[0043] (1) Accurately weigh 19.2mg of iridium black (0.1mmol) into 50mL of deionized water, and ultrasonically disperse for 15min.

[0044] (2) Heat the above dispersion to 70°C, stir for 15 minutes and then 20ml K 2 PtCl 4 (0.001mol / L), so that the ratio of the amount of Pt to Ir is 0.2:1, and then stirred and reacted for 12h.

[0045] (3) After the reaction, it was naturally cooled to room temperature, then centrifuged, and then washed 4 times with a mixed solution of deionized water and ethanol to obtain a double-effect oxygen electrode catalyst.

[0046] Depend on Figure 4 It can be seen that the ORR activity of the catalyst prepared in Example 2 is much higher than that of the comparative catalyst.

Embodiment 3

[0048] (1) Accurately weigh 19.2mg of iridium black (0.1mmol) into 20mL of deionized water, and ultrasonically disperse for 15min.

[0049] (2) Bring the dispersion of the above solution to 100°C, stir for 15 minutes and then add 4ml K 2 PtCl 4 (0.005mol / L), so that the ratio of the amount of substance of Pt and Ir is 0.2:1, then stirred and reacted for 12h.

[0050] (3) After the reaction, it was naturally cooled to room temperature, then centrifuged, and then washed 4 times with a mixed solution of deionized water and ethanol to obtain a double-effect oxygen electrode catalyst.

[0051] from diagram 2-1 , Figure 2-2 It can be seen that highly dispersed Pt nanoparticles were successfully modified on the surface of IrBlakck, and this structure can greatly improve the utilization rate of Pt.

[0052] from image 3 As can be seen in , IrBlakck exhibits a typical Ir 3+ / Ir 4+ and Ir 4+ / Ir 5+ redox peak, while the IrBlakck surface-modified Pt-type catalyst prepared by ...

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Abstract

The invention discloses a preparation method of a carrier metal iridium surface platinum-modified bi-functional oxygen electrode catalyst. Metal iridium serving as a carrier has an oxygen evolution function, and precious metal-induced metal ions are subjected to a reduction reaction to modify the precious metal platinum having a catalytic oxygen reduction function. Since the metal iridium has excellent oxygen evolution activity, the metal platinum has excellent oxygen reduction activity. The catalyst can be applied to an oxygen electrode of an integrated regenerative fuel cell. Compared with asimple commercialized catalyst, namely a mechanical mixture of iridium black and platinum black, the bi-functional oxygen electrode catalyst disclosed by the invention has the advantage that the oxygen reduction performance can be obviously improved while not sacrificing oxygen precipitation activity. In addition, according to the method disclosed by the invention, no organic reagent is used, sothe catalyst is very environment-friendly and meets the green development requirement.

Description

technical field [0001] The invention relates to a preparation method of a double-effect oxygen electrode catalyst, specifically a catalyst applied to an oxygen electrode of an integrated renewable fuel cell, belonging to the field of electrochemistry. Background technique [0002] The integrated renewable fuel cell (URFC) is an energy conversion and storage device developed on the basis of polymer electrolyte fuel cells and polymer electrolyte water electrolysis cells. The device has high energy density (400-1000Wh / Kg), long-term Storage has no self-discharge loss, is not affected by the depth of discharge, and more importantly, the high voltage H generated when it works in water electrolysis mode 2 and O 2 It can be used not only for attitude control of space vehicles, but also for life support system of astronauts, so it can be used for space power supply. In addition, URFC can also be used in conjunction with renewable energy such as solar energy and wind energy on land...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/925Y02E60/50
Inventor 邵志刚方达晖张洪杰杨丽梦孙树成
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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