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Graphene-based gas diffusion electrode for proton exchange membrane fuel cell and preparation method of graphene-based gas diffusion electrode

A gas diffusion electrode and proton exchange membrane technology, which is applied in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve the problems of high consumption of noble metal catalysts, cumbersome manufacturing process, poor controllability, etc., and achieve low utilization rate of catalysts , The method is simple, and the effect of reduction is good

Inactive Publication Date: 2017-11-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another object of the present invention is to provide a method for preparing the above-mentioned graphene-based gas diffusion electrode for proton exchange membrane fuel cells. Through a relatively simple three-step synthesis process, a highly dense and uniform electrode with high Pt utilization rate is prepared. The new graphene-based gas diffusion electrode for hydrogen-oxygen fuel cells simultaneously solves the problems of cumbersome manufacturing process of gas diffusion electrodes for fuel cells, poor controllability and high consumption of noble metal catalysts caused by thick catalytic layers

Method used

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  • Graphene-based gas diffusion electrode for proton exchange membrane fuel cell and preparation method of graphene-based gas diffusion electrode
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  • Graphene-based gas diffusion electrode for proton exchange membrane fuel cell and preparation method of graphene-based gas diffusion electrode

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Embodiment 1

[0028] 400 ml of graphite oxide solution of 12.5 mg / ml was prepared by Hummers method. Take 6ml of graphite oxide solution, add 69ml of deionized water, stir until it is evenly mixed, and obtain 75ml of 1mg / ml graphite oxide solution. Cut 3×3cm 2 Carbon paper, put it into a watch glass, use a straw to absorb the graphite oxide solution, and evenly drop it on the carbon paper. Put the watch glass into an oven, set the temperature at 60°C, and dry it for 30 minutes, then transfer the sample to a tube furnace, feed a hydrogen-argon mixture with a hydrogen concentration of 5%, raise the temperature to 800°C, and keep it warm for 2 hours. After cooling, take it out to obtain a carbon paper covered with a reduced graphene oxide film. Use the sample as the substrate, fix it on the base of the magnetron sputtering instrument chamber, load the Pt target on the DC target position, adjust the distance between the target and the substrate to 15cm, and evacuate to 7×10 -4 Pa, set the sp...

Embodiment 2

[0033] 400 ml of graphite oxide solution of 12.5 mg / ml was prepared by Hummers method. Take 6ml of graphite oxide solution, add 69ml of deionized water, stir until it is evenly mixed, and obtain 75ml of 1mg / ml graphite oxide solution. Cut 3×3cm 2 Carbon paper, put it into a watch glass, use a straw to absorb the graphite oxide solution, and evenly drop it on the carbon paper. Put the watch glass into an oven, set the temperature at 60°C, and dry it for 30 minutes, then transfer the sample to a tube furnace, feed a hydrogen-argon mixture with a hydrogen concentration of 5%, raise the temperature to 800°C, and keep it warm for 2 hours. After cooling, take it out to obtain a carbon paper covered with a reduced graphene oxide film. Use the sample as the substrate, fix it on the base of the magnetron sputtering instrument chamber, load the Pt target on the DC target position, adjust the distance between the target and the substrate to 15cm, and evacuate to 7×10 -4 Pa, set the sp...

Embodiment 3

[0036] 400 ml of graphite oxide solution of 12.5 mg / ml was prepared by Hummers method. Take 6ml of graphite oxide solution, add 69ml of deionized water, stir until it is evenly mixed, and obtain 75ml of 1mg / ml graphite oxide solution. Cut 3×3cm 2 Carbon paper, put it into a watch glass, use a straw to absorb the graphite oxide solution, and evenly drop it on the carbon paper. Put the watch glass into an oven, set the temperature at 60°C, and dry it for 30 minutes, then transfer the sample to a tube furnace, feed a hydrogen-argon mixture with a hydrogen concentration of 5%, raise the temperature to 800°C, and keep it warm for 2 hours. After cooling, take it out to obtain a carbon paper covered with a reduced graphene oxide film. Use the sample as the substrate, fix it on the base of the magnetron sputtering instrument chamber, load the Pt target on the DC target position, adjust the distance between the target and the substrate to 15cm, and evacuate to 7×10 -4 Pa, set the sp...

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Abstract

The invention discloses a graphene-based gas diffusion electrode for a proton exchange membrane fuel cell and a preparation method of the graphene-based gas diffusion electrode. The graphene-based gas diffusion electrode contains a Pt nanowire thin film, a reduction-oxidization graphene layer and carbon paper, wherein the thickness of the Pt nanowire thin film reaches 5-20 nanometers, and the pore coverage rate of reduction-oxidization graphene on the carbon paper reaches 80-98%. The preparation method is divided into a Hummer method, a thermal-reduction method and a DC sputtering method and comprises the steps of firstly, preparing a graphite oxide solution by the Hummer method; secondly, diluting the graphite oxide solution, dropwise coating the graphite oxide solution on the carbon paper, and obtaining the reduction-oxidization graphene by the thermal-reduction method; and finally, sputtering Pt onto the carbon paper covered by the reduction-oxidization graphene by the DC sputtering method to obtain a target material. During electrochemical test on the prepared graphene-based gas diffusion electrode, relatively high electrochemical activity area and excellent formic acid oxidization property are shown.

Description

technical field [0001] The invention relates to the field of material chemistry and the technical field of high-energy battery materials, in particular to a novel graphene-based gas diffusion electrode for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] With the continuous depletion of fossil energy and the increasingly serious environmental problems, fuel cells, as a new type of clean energy power generation device, have attracted the attention of the industry. Among them, proton exchange membrane fuel cells have been widely used due to their ability to operate at low temperatures. focus on. Catalysts are key to the development of proton exchange membrane fuel cells, not only as a constraint on their price, but also as an important determinant of their chemical and mechanical stability. Therefore, how to reduce the amount of catalyst used and improve the utilization rate of the catalyst has become a research hotspot in r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/1004H01M4/86H01M4/90H01M4/92H01M4/88
CPCH01M4/86H01M4/88H01M4/9083H01M4/926H01M8/10H01M8/1004Y02E60/50
Inventor 周游刘建国陈志玲李雨馨
Owner NANJING UNIV
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