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Three-dimensional proton conductor based ordered single electrode and membrane electrode as well as preparation methods

A proton conductor and single-electrode technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as negative impact on mechanical properties, increase and mass transfer capacity, improve utilization, reduce The effect of dosage

Inactive Publication Date: 2012-10-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjemian et al. (Chem Mater, 2006, 18; 2238-2248) added inorganic oxide particles (SiO2, TiO2, Al2 O3, ZrO2) to make a composite film, the study found that SiO2 and TiO2 >When the doped composite membrane is used as a battery proton exchange membrane, the battery electrode has a better CO2 resistance than the Nafion membrane battery electrode at 130 ° C, but the addition of inorganic substances has a negative impact on the mechanical properties of the membrane

Method used

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  • Three-dimensional proton conductor based ordered single electrode and membrane electrode as well as preparation methods
  • Three-dimensional proton conductor based ordered single electrode and membrane electrode as well as preparation methods
  • Three-dimensional proton conductor based ordered single electrode and membrane electrode as well as preparation methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put the Pt target into the evaporation chamber, put a 3D structure proton conductor into the sample chamber, and vacuum the evaporation chamber to 4×10 -4 Pa, electron beam current 27A, evaporation for about 15 seconds, a layer of active metal Pt catalyst of about 1.2nm is uniformly plated on the side of the proton conductor with fibers and the surface of the fibers, and a Pt loading of 0.05 mg / cm is prepared. 2 single electrode.

[0037] Evaporate in the same way for 8 minutes, the thickness of the coating is about 3.7nm, and prepare another Pt loading of 0.15 mg / cm 2 single electrode.

[0038] Take a single electrode, drop a few drops of Nafion solution on the back of the fiber surface to make it cover the entire surface, then stick the back of the fiber surface of another single electrode on it, and dry it in an oven at 80°C to obtain a film electrode.

[0039] The membrane electrode and two pretreated gas diffusion layers are hot-pressed to obtain a high-performa...

Embodiment 2

[0046] Put the Pt target into the evaporation chamber, put a 3D structure proton conductor into the sample chamber, and vacuum the evaporation chamber to 4×10 -4 Pa, electron beam current 27A, evaporation for about 15 seconds, a layer of active metal Pt catalyst of about 1.2nm is uniformly plated on the side of the proton conductor with fibers and the surface of the fibers, and a Pt loading of 0.05 mg / cm is prepared. 2 single electrode.

[0047] Evaporate in the same way for 8 minutes, the thickness of the coating is about 3.7nm, and prepare another Pt loading of 0.15 mg / cm 2 single electrode.

[0048] Take a prepared single electrode, drop a few drops of the above-mentioned short-chain Nafion solution on the back of the fiber surface to make it cover the entire surface, then stick the back of the fiber surface of another single electrode on it, and place it in an oven at 80°C dry to obtain a membrane electrode.

[0049] The membrane electrode and two pretreated gas diffusi...

Embodiment 3

[0056] Put the Pt target into the evaporation chamber, put a 3D structure proton conductor into the sample chamber, and vacuum the evaporation chamber to 3×10 -4 Pa, electron beam current, 28A, vapor deposition for about 30 minutes, uniformly coat a layer of 14nm active metal Pt catalyst on the side of the 3D structure proton conductor with fibers and the surface of the fibers, and prepare a Pt loading of 0.2 mg / cm 2 single electrode.

[0057] Evaporate for 40 minutes with the same method, the thickness of the coating is about 20nm, and another Pt loading is 0.3 mg / cm 2 single electrode.

[0058] Take a prepared single electrode, drop a few drops of sulfonated polysulfone resin solution on the back of the fiber surface to make it cover the entire surface, then stick the back of the fiber surface of another single electrode on it, and place it at 100°C drying in an oven to obtain a membrane electrode.

[0059] The membrane electrode is pressed together with two pretreated ga...

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Abstract

The invention relates to a three-dimensional proton conductor based single electrode and a membrane electrode as well as preparation methods. According to the invention, firstly a three-dimensional proton conductor with a nanofiber array structure is prepared, then the proton conductor of the structure is prepared into an ordered single electrode, and two single electrodes are then combined into an ordered fucel cell membrane electrode. The single electrode is characterized in that a three-dimensional proton conductor is adopted as the basis, and a magnetron sputtering technology is employed for uniform vapor deposition of a layer of a nano-active metal catalyst on a nanofiber surface. The membrane electrode is characterized in that nanofiber arrays grow on two sides of the membrane electrode, and a layer of a nano-active metal catalyst is formed on surfaces of the nanofiber arrays through vapor deposition. The nanofiber arrays grow on two sides of the membrane electrode, so that the area of a catalytic layer is substantially increased while the proton conduction efficiency is ensured simultaneously, thus being in favor of mass transfer and reduction of proton conductor dosage. Meanwhile, the vapor deposition technology is adopted, the nano-active metal membrane has controllable thickness and is uniform, and while improving the catalytic performance of a noble metal or its alloy, consumption of the active metal catalyst can be reduced substantially.

Description

technical field [0001] The invention relates to a 3-dimensional (3D) proton conductor with a nanofiber array structure, an ordered single electrode prepared from the structured proton conductor, and then two ordered single electrodes are combined to form an ordered membrane electrode. The membrane electrode is particularly suitable for use in fuel cells. The invention also relates to the preparation method of the 3-dimensional proton conductor, ordered single electrode and ordered membrane electrode. Background technique [0002] In today's increasingly serious energy crisis, as a new type of energy device, Proton Exchange Membrane Fuel Cell (PEMFC) has attracted people's attention due to its advantages of energy saving, pollution-free, quick start, etc. A hotspot of competing research. Proton exchange membrane (PEM) is one of the core components of proton exchange membrane fuel cells. It plays the role of conducting protons, isolating fuel and oxidant, and preventing elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94H01M4/88B82Y30/00
CPCY02E60/50
Inventor 木士春袁庆潘牧
Owner WUHAN UNIV OF TECH
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