Preparation of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material, and application of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material in electrocatalytic oxygen reduction reaction and oxygen evolution reaction

A technology of bifunctional catalysts and composite materials, applied in the field of preparation of nano-catalysts, can solve problems such as unpublished literature or patent reports, and achieve the effects of avoiding pollution and energy consumption, large catalytic activity, and good application prospects.

Inactive Publication Date: 2017-11-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the present invention, the preparation of cobalt-platinum-based composite materials confined by diatomite as a bifunctional catalyst and its application in electrocatalytic oxygen reduction and oxygen evolution reactions have not yet been published in literature or patent reports

Method used

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  • Preparation of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material, and application of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material in electrocatalytic oxygen reduction reaction and oxygen evolution reaction
  • Preparation of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material, and application of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material in electrocatalytic oxygen reduction reaction and oxygen evolution reaction
  • Preparation of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material, and application of bifunctional catalyst diatomite domain limited cobalt-platinum-based composite material in electrocatalytic oxygen reduction reaction and oxygen evolution reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Disperse diatomaceous earth to 40mL 3mol L -1 HCl solution, magnetically stirred for 12 hours, then suction filtered, washed with deionized water until the pH of the filtrate was ~7, and the filter cake was dried in a vacuum oven at 50°C for 12 hours, and the product was marked as DTM for future use.

[0037] (2) Control the molar ratio of Co and Pt to be Co / Pt=1 with the precursor salt of Co and Pt 0.25mmol CoCl 2 ·6H 2 O and 0.25mol H 2 PtCl 6 ·6H 2 O, add to 20mL EG solution, add 76mg DTM after the precursor salt is completely dissolved, stir for 30min, then start heating from room temperature to 160°C for 6h.

[0038] (3) When the reaction temperature drops to 40°C, add 76 mg of carbon powder, stir for 4 hours, and wash by centrifugation. CoPt-1 / DTM-C catalyst can be obtained by drying at 50℃ for 12h under vacuum condition.

[0039] Electrochemical performance test:

[0040] The electrochemical test and characterization was performed on the CHI 750E electro...

Embodiment 2

[0051] (1) Disperse diatomaceous earth to 40mL 3mol L -1 HCl solution, magnetically stirred for 12 hours, then suction filtered, washed with deionized water until the pH of the filtrate was ~7, and the filter cake was dried in a vacuum oven at 50°C for 12 hours, and the product was marked as DTM for future use.

[0052] (2) Control the molar ratio of Co and Pt to be Co / Pt=3 with the precursor salt of Co and Pt 0.75mmol CoCl 2 ·6H 2 O and 0.25mol H 2 PtCl 6 ·6H 2 O, add to 20mL EG solution, add 76mg DTM after the precursor salt is completely dissolved, stir for 30min, then start heating from room temperature to 160°C for 6h.

[0053] (3) When the reaction temperature dropped to 40°C, 76 mg of carbon powder was added, stirred for 4 hours, and washed by centrifugation. CoPt-3 / DTM-C catalyst can be obtained by drying at 50℃ for 12h under vacuum condition.

Embodiment 3

[0055] (1) Disperse diatomaceous earth to 40mL 3mol L -1 HCl solution, magnetically stirred for 12 hours, then suction filtered, washed with deionized water until the pH of the filtrate was ~7, and the filter cake was dried in a vacuum oven at 50°C for 12 hours, and the product was marked as DTM for future use.

[0056] (2) Control the molar ratio of Co and Pt to be Co / Pt=9 with the precursor salt of Co and Pt 2.25mmol CoCl 2 ·6H 2 O and 0.25mol H 2 PtCl 6 ·6H 2 O, add to 20mL EG solution, add 76mg DTM after the precursor salt is completely dissolved, stir for 30min, then start heating from room temperature to 160°C for 6h.

[0057] (3) When the reaction temperature dropped to 40°C, 76 mg of carbon powder was added, stirred for 4 hours, and washed by centrifugation. CoPt-9 / DTM-C catalyst can be obtained by drying at 50℃ for 12h under vacuum condition.

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Abstract

The invention discloses preparation of a diatomite (DTM) domain limited cobalt-platinum-based composite material (CoPt-x/DTM-C) prepared by a simple method, and electrocatalytic application thereof. The invention has the advantages that: (1) the preparation method is simple: firstly, Pt4 and Co2+ ions are adsorbed by the pores of DTM, then the Pt4 and Co2+ ions are reduced, and the structure of the catalyst prepared by the method cannot be damaged easily in the reaction; (2) the catalytic activity is high: in the oxygen reduction reaction, the mass activity and specific activity of the composite material are respectively 2.5 and 1.5 times as large as those of CoPt-x/C and are respectively 4.6 and 2.2 times as large as those of platinum-carbon; and in the oxygen evolution reaction, the overpotential of CoPt-x/DTM-C is reduced by 30 mV compared with that of the CoPt-x/C; and (3) the cost is low: the Pt content of the catalyst is low, the diatomite source is wide, and thus the cost of the catalyst is greatly reduced, and the commercial application prospect is good.

Description

technical field [0001] The confined cobalt-platinum alloy nanomaterial prepared by the invention is applied to electrocatalytic oxygen reduction and oxygen evolution reaction, and belongs to the field of new energy materials. It specifically relates to the preparation of nano-catalysts and their applications in metal-air batteries and proton exchange membrane fuel cells. Background technique [0002] New energy conversion and storage devices are an effective way to solve current energy and environmental problems. Fuel cells have attracted widespread attention from society for their high energy conversion efficiency, environmental friendliness, and portability. Proton exchange membrane fuel cells have the advantages of clean and pollution-free, low working temperature, fast start-up, simple structure and convenient operation. power supply. The oxidation of hydrogen fuel occurs at the anode, and the reduction of oxygen occurs at the cathode. Both electrodes contain catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92H01M12/06
CPCH01M4/8825H01M4/9041H01M4/921H01M12/06
Inventor 唐正华王凯
Owner SOUTH CHINA UNIV OF TECH
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