A kind of nanofiber network structure electrode and its preparation method and application

A nanofiber and network structure technology, applied in the field of gas diffusion electrodes with a new nanofiber network structure, can solve the problems of large mass transfer resistance and affect the overall performance of the battery, achieve high utilization rate, improve oxygen reduction capacity per unit mass, and improve reaction conditions mild effect

Active Publication Date: 2017-10-03
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

In the traditional gas diffusion electrode or membrane electrode mentioned above, the catalyst particles are Under the action of the binder, a loose and porous thin layer is formed, and the mass transfer resistance of the reactants in the disordered channels is relatively large, which affects the overall performance of the battery

Method used

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  • A kind of nanofiber network structure electrode and its preparation method and application
  • A kind of nanofiber network structure electrode and its preparation method and application
  • A kind of nanofiber network structure electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a. Preparation of spinning slurry

[0043] Disperse the PAN powder with a molecular weight of 1.5 million into ethanol with a mass concentration of 8%, and stir at room temperature for 12 hours;

[0044]Exchange dinitrosodiamine platinum to the surface of graphene oxide by ion exchange method: ultrasonically disperse graphite oxide in the aqueous solution for 4 hours; add dinitrosodiamine platinum aqueous solution, and react at 70°C for 48 hours; Then mix with Nafion polyion solution, concentrate to a solid content of 5wt%; mix the resulting slurry with the above-mentioned PAN solution, and stir to obtain a nanofiber network structure spinning slurry; until Pt accounts for 10wt% of the total solid mass in the slurry;

[0045] b. Electrospinning preparation of catalytic layer

[0046] Using aluminum foil paper as the base, use the slurry prepared in the above step a as the feed liquid at a feed rate of 2mL·h -1 , Spinning under the condition of spinning voltage of 35kV...

Embodiment 2

[0050] a. Preparation of spinning slurry

[0051] Disperse the PAN powder with a molecular weight of 1.5 million into DMF with a mass concentration of 8%, and stir at room temperature for 12 hours;

[0052] Exchange dinitrosodiamine platinum to the surface of graphene oxide by ion exchange method: ultrasonically disperse graphite oxide in the aqueous solution for 4 hours; add dinitrosodiamine platinum aqueous solution, and react at 70°C for 48 hours; Then mix with Nafion polyion solution, concentrate to a solid content of 5wt%; mix the obtained slurry with the above-mentioned PAN solution, and stir to obtain a nanofiber network structure spinning slurry; until Pt accounts for 15wt% of the total solid mass in the slurry;

[0053] b. Electrospinning preparation of catalytic layer

[0054] Using aluminum foil paper as the base, use the slurry prepared in the above step a as the feed liquid at a feed rate of 2mL·h -1 , Spinning under the condition of spinning voltage of 35kV, th...

Embodiment 3

[0058] a. Preparation of spinning slurry

[0059] Disperse the PAN powder with a molecular weight of 1.5 million into water with a mass concentration of 8%, and stir at room temperature for 12 hours;

[0060] Exchange dinitrosodiamine platinum to the surface of graphene oxide by ion exchange method: ultrasonically disperse graphite oxide in the aqueous solution for 4 hours; add dinitrosodiamine platinum aqueous solution, and react at 70°C for 48 hours; Then mix with Nafion polyion solution, concentrate to a solid content of 5wt%; mix the obtained slurry with the above-mentioned PAN solution, and stir to obtain a nanofiber network structure spinning slurry; until Pt accounts for 20wt% of the total solid mass in the slurry;

[0061] b. Electrospinning preparation of catalytic layer

[0062] Using aluminum foil paper as the base, use the slurry prepared in the above step a as the feed liquid at a feed rate of 2mL·h -1 , Spinning under the condition of spinning voltage of 35kV, ...

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Abstract

The invention relates to a novel nanofiber network structure electrode and its preparation and application. The nanofiber network structure electrode includes a gas diffusion layer or a proton exchange membrane, and a nanofiber network structure catalyst layer based on the gas diffusion layer or proton exchange membrane; The catalyst layer with nanofiber network structure is attached to the surface of one side of the gas diffusion layer or the proton exchange membrane, and has a nanofiber network structure microscopically. Compared with the prior art, the present invention has the following advantages: high stability of the catalytic layer, high utilization rate of the catalyst, good mass transfer performance in the catalytic layer, strong practicability and the like.

Description

technical field [0001] The invention relates to a novel nanofiber network structure gas diffusion electrode, specifically a nanofiber network structure electrode that can be used in proton exchange membrane fuel cells, direct liquid fuel cells, metal-air batteries and proton exchange membrane water electrolysis cells . [0002] The invention also relates to a preparation method of the above-mentioned novel nanofiber network structure gas diffusion electrode. Background technique [0003] Due to its high efficiency and environmental friendliness, proton exchange membrane fuel cells have been paid close attention to by research institutions in various countries in recent years. Membrane electrode (MEA), as the core component of fuel cell, usually consists of gas diffusion layer, catalytic layer and proton exchange membrane. The catalytic layer is the place where the electrochemical reaction occurs in the membrane electrode assembly (MEA). The performance and stability of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/94H01M4/88H01M8/0245B82Y40/00H01M8/1004
CPCB82Y40/00H01M4/86H01M4/88H01M4/94Y02E60/50Y02P70/50
Inventor 孙公权夏章讯王素力姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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