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Porous electrode and preparation and application thereof

A porous electrode and multi-level pore technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as difficult to achieve electrode performance, difficult to achieve in-depth research on electrode performance, uncontrollable porosity, pore size and channel shape, etc. Achieve the effect of reducing uncontrollable factors, increasing porosity and high utilization rate

Inactive Publication Date: 2018-10-02
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 electrode preparation method, the electrode layer formed by cross-linking and stacking the electrode material slurry on the substrate through various coating technologies often has uncontrollable porosity, pore size and channel shape, and it is difficult to realize the structure and efficiency of the electrode. In-depth research, it is also difficult to improve the performance of the electrode

Method used

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  • Porous electrode and preparation and application thereof
  • Porous electrode and preparation and application thereof
  • Porous electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. Preparation of electrode slurry

[0032] Take a certain mass of 60% Pt / C catalyst material, add 5 times of deionized water, 20 times of absolute ethanol, and 5% perfluorosulfonic acid polyion isopropanol solution (accounting for 20% of the mass fraction of the catalytic layer) in order. %), ultrasonically dispersed for 30min. Subsequently, polystyrene template beads with an average particle diameter of 2 μm were added, accounting for 50% of the mass fraction of the catalytic layer, and dispersed evenly by ultrasonication for 30 minutes.

[0033] b. Preparation of Porous Electrode

[0034] The above slurry is coated on the gas diffusion layer substrate by blade coating, and then dried by natural air drying.

[0035] The above dried sample was immersed in acetone solution for 2 hours to remove the template, and then rinsed with deionized water and dried to obtain the prepared porous electrode.

Embodiment 2

[0042] a. Preparation of electrode slurry

[0043] Take a certain mass of PtCo catalyst material, add 10 times of deionized water, 10 times of absolute ethanol, and 5% perfluorosulfonic acid polyion isopropanol solution (accounting for 50% of the mass fraction of the catalytic layer) in order, and ultrasonically 30 minutes to disperse evenly. Then polysilicon template beads with an average particle size of 1 μm were added, accounting for 50% of the mass fraction of the catalytic layer, and dispersed evenly by ultrasonication for 30 minutes.

[0044] b. Preparation of Porous Electrode

[0045] The above slurry is coated on the electrolyte membrane substrate by spraying, and then dried by vacuum drying or the like.

[0046] The above samples were immersed in 0.1M hydrofluoric acid solution for 5 hours to remove the template, then rinsed with deionized water and dried to obtain the prepared porous electrode.

Embodiment 3

[0048] a. Preparation of electrode slurry

[0049] Take by weighing a certain mass of 60% Pd / C catalyst material, add 10 times of deionized water, 20 times of absolute ethanol, 5% perfluorosulfonic acid polyion isopropanol solution (accounting for 40% of the mass fraction of the catalytic layer) in order. %), ultrasonically dispersed for 30min. Then, iron ferric oxide template pellets with an average particle size of 0.5 μ were added, accounting for 70% of the mass fraction of the catalytic layer, and dispersed evenly by ultrasonication for 30 minutes.

[0050] b. Preparation of Porous Electrode

[0051] The above-mentioned slurry is coated on substrates such as aluminum foil by spraying, and then dried by heating.

[0052] The above samples were immersed in 1M dilute sulfuric acid solution for 5 hours to remove the template, then rinsed with deionized water and dried to obtain the prepared porous electrode.

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Abstract

The invention provides a porous electrode and preparation and application thereof. The porous electrode has multi-grade pore structures including the spherical pore structures and the nanometer-sizedsecondary structures, wherein the diameters of the spherical pore structures are in micron grades or submicron grades; the spherical pore structures are formed by using one of removable polystyrene pellets, silicon dioxide pellets, polycrystalline silicon pellets and ferroferric oxide pellets as a spherical hard template, and the nanometer-sized secondary structures are formed by stacked catalystparticles which adhere through polyions. Compared with the prior art, the pore structures and pore density of the porous electrode are orderly and controllable, the porosity of the prepared porous electrode is improved, pores are orderly, the mass transfer performance is better, most of the surface of noble metal can be exposed to a mass transfer channel, and therefore the utilization rate is high; compared with other preparation methods, the preparation process adopts a template method and is high in controllability, uncontrollable factors caused by other methods are reduced, and the practicability is high.

Description

technical field [0001] The invention relates to a novel porous electrode and its structure. Specifically, the porous electrode has an adjustable spherical pore structure, and the pore size and pore distribution density can be adjusted. It can be used in proton exchange membrane fuel cells, direct liquid fuel In electrodes such as batteries, metal-air batteries and supercapacitors, lithium-ion batteries, etc. [0002] The present invention also relates to a method for preparing the above-mentioned composite material. Background technique [0003] Electrode materials with hierarchical pore structures have great application potential in the fields of electronics, energy, and biomedicine. Conductive materials suitable for electrochemical environments in electrodes are usually various carbon-based nanomaterials, such as carbon nanotubes, graphene, activated carbon, etc. A notable feature of this type of material is that it usually presents a flexible feature, and in the process...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88B82Y40/00
CPCB82Y40/00H01M4/8626H01M4/8814H01M4/8828Y02E60/50
Inventor 王素力夏章讯孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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