Hydrophilic/hydrophobic membrane electrode of ionic liquids

A hydrophobic membrane electrode, ionic liquid technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of increasing charge transfer resistance ohmic resistance, affecting the proton transport performance of membrane electrodes, and affecting the mechanical properties of proton exchange membranes, etc. Stabilization, improved ion transport capacity and stability, the effect of improved performance

Active Publication Date: 2020-12-11
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most self-humidifying membrane electrode preparation technologies use hydrophilic inorganic oxides mixed with catalysts as the anode catalytic layer of the proton exchange membrane, and the cathode side uses hydrophobic inorganic oxides or PTFE mixed with catalysts as the cathode catalytic layer of the proton exchange membrane. For example, patents with publication numbers CN104716351A, CN103078122A and CN1750301A use TiO 2 , SnO 2 or W 2 o 3 Inorganic oxides are used as hydrophilic materials, but t

Method used

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  • Hydrophilic/hydrophobic membrane electrode of ionic liquids
  • Hydrophilic/hydrophobic membrane electrode of ionic liquids

Examples

Experimental program
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Effect test

example 1

[0033] A kind of hydrophilic / hydrophobic membrane electrode related to ionic liquid, its preparation method is:

[0034] (1) Proton exchange membrane treatment

[0035] Place the proton exchange membrane in 8% hydrogen peroxide solution, place it at 80°C for 1 hour, then place it in 1mol / L sulfuric acid solution at 80°C for one hour, wash off the sulfuric acid solution with deionized water, and place it Stand-by in deionized water;

[0036] (2) Anode catalyst slurry preparation

[0037] The ionic liquid [MTBD] [BF 4 ], Pt / C catalyst, isopropanol solvent, and Nafion solution were placed in a glass bottle, wherein the ionic liquid [MTBD][BF 4 ], the mass percentages of Pt / C catalyst, isopropanol solvent, and Nafion solution are respectively 0.3%, 1.7%, 95%, and 3%, and ultrasonically disperses for 30 minutes to obtain a uniformly dispersed anode catalyst slurry;

[0038] (3) Preparation of cathode catalyst slurry

[0039]①The ionic liquid [MTBD][NTf 2 ], isopropanol solven...

example 2

[0054] A kind of hydrophilic / hydrophobic membrane electrode related to ionic liquid, its preparation method is:

[0055] (1) Proton exchange membrane treatment

[0056] Same as example 1;

[0057] (2) Anode catalyst slurry preparation

[0058] On the basis of Example 1, the ionic liquid is replaced by [MTBD][HSO 4 ], the catalyst is replaced by Pt-Co / C;

[0059] (3) Preparation of cathode catalyst slurry

[0060] On the basis of Example 1, the ionic liquid is replaced by [MTBD][PF 6 ], catalyst is replaced by Pt-Co / C, and other steps are with example 1;

[0061] (4) Catalyst slurry coating

[0062] Evenly coat the prepared anode catalyst slurry and cathode catalyst slurry on both sides of the treated proton exchange membrane at a coating temperature of 80°C, where the Pt loading on the anode side is controlled at 0.02mgPt / cm 2 , the Pt loading on the cathode side is controlled at 0.1mgPt / cm 2 , the ionic liquid accounts for 20% by mass on both the anode side and the ca...

example 3

[0064] A kind of hydrophilic / hydrophobic membrane electrode related to ionic liquid, its preparation method is:

[0065] (1) Proton exchange membrane treatment

[0066] Same as example 1;

[0067] (2) Anode catalyst slurry preparation

[0068] On the basis of Example 1, the ionic liquid is replaced by [MTBD][H 2 PO 4 ], the catalyst is replaced by Pt-Ni / C;

[0069] (3) Preparation of cathode catalyst slurry

[0070] On the basis of example 1, catalyst replaces Pt-Ni / C, and other steps are with example 1;

[0071] (4) Catalyst slurry coating

[0072] The prepared anode catalyst slurry and cathode catalyst slurry were evenly coated on both sides of the treated proton exchange membrane at a coating temperature of 80°C, and the Pt loading on the anode side was controlled at 0.05mgPt / cm 2 , the Pt loading on the cathode side is controlled at 0.15mgPt / cm 2 , the ionic liquid accounts for 50% by mass on both the anode side and the cathode side.

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Abstract

The invention belongs to the technical field of membrane electrode preparation, and particularly relates to a hydrophilic/hydrophobic membrane electrode of ionic liquids. An anode catalyst layer is prepared from the hydrophilic proton type ionic liquid and a catalyst, and a cathode catalyst layer is prepared from a hydrophobic and oxytropic proton type ionic liquid and a catalyst. A self-humidifying membrane electrode is prepared by taking the ionic liquids with special physical and chemical properties as raw materials for preparing the catalyst layers, so that the problem that the charge transfer resistance is increased due to the fact that inorganic oxide is taken as an additive for preparing the self-humidifying membrane electrode is effectively solved; the selected ionic liquids have negligible volatility, so the ion transmission capacity and stability of the membrane electrode are greatly improved; and meanwhile, the hydrophobic ionic liquid can be adsorbed into the pore channelsof the catalyst under a high-vacuum condition through a continuous vacuumizing treatment process, so that the ionic liquid can be uniformly dispersed on each surface of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of membrane electrode preparation, and in particular relates to a hydrophilic / hydrophobic membrane electrode related to ionic liquid. Background technique [0002] Membrane electrode, as a key component in the hydrogen-oxygen fuel cell stack, plays a decisive role in the performance of the fuel cell stack. The membrane electrode is composed of the cathode and anode catalytic layers and the proton exchange membrane. The catalytic layer and the proton exchange membrane are the key components of the membrane electrode. , the catalytic layer plays the role of accelerating the oxygen reduction reaction, and the proton exchange membrane plays the role of isolating electrons and transporting protons. As a proton-conducting perfluorosulfonic acid polymer, the proton exchange membrane is heavily dependent on its Therefore, it is necessary to humidify the reaction gas to maintain a good hydration state of the proton e...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/1004
CPCH01M4/8663H01M4/881H01M4/8828H01M8/1004Y02E60/50
Inventor 杨代辉冯勇陈果白亚峰薛峰陈晓涛石斌刘江涛
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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