Film electrode with ultralow oxygen mass transfer resistance

A mass transfer resistance and membrane electrode technology, applied in battery electrodes, circuits, fuel cells, etc., can solve problems affecting the mass transfer resistance of the catalytic layer, battery mass transfer polarization loss, etc., to achieve optimal Nafion distribution, reasonable Nafion distribution, The effect of reducing mass transfer resistance

Active Publication Date: 2020-01-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, platinum catalysts used in proton exchange membrane fuel cells usually use carbon materials as supports, and different catalyst carbon supports will affect the mass transfer resistance of the catalytic layer
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Method used

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  • Film electrode with ultralow oxygen mass transfer resistance
  • Film electrode with ultralow oxygen mass transfer resistance
  • Film electrode with ultralow oxygen mass transfer resistance

Examples

Experimental program
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Example Embodiment

[0034] 1. Preparation of materials. Mix XC-72 type carbon with concentrated sulfuric acid (mass ratio is 1:3), react at 180℃ for 24h, and load negative charge to obtain negative charge modified carbon carrier. Disperse 2 g of negatively charged modified carbon carrier in 200 ml of aqueous solution and dissolve 2.5 g of chloroplatinic acid hexahydrate. After 30 minutes of ultrasound, add 0.5 mol L dropwise -1 A total of 6 ml of sodium borohydride solution is reduced to platinum nanoparticles to obtain a negatively charged platinum-carbon catalyst.

[0035] 2. Preparation of membrane electrode. Add 0.062g of negatively charged platinum carbon catalyst and 0.15g of 20% concentration of commercial ionic resin Nafion solution to 15ml of isopropanol and water mixed solvent (volume ratio 3:1), and further add 0.031g of negatively charged modification The carbon support, the mixed slurry was ball milled for 24 hours, and then sprayed on the proton membrane as the cathode.

[0036] The a...

Example

[0040] Examples 1~3

[0041] In order to optimize the amount of negatively charged carbon carriers, the present invention adopts three examples. Examples 1, 2, and 3 correspond to the doped negatively charged modified carbon carrier and the negatively charged platinum-carbon catalyst (the platinum loading of the catalyst is about 50 %) mass ratios are 0.3:1, 0.5:1, 0.6:1, respectively.

Example

[0042] Comparative examples 1 to 3

[0043] Since conventional commercial catalysts generally use carbon carriers such as XC-72, KJ-600, etc., as carbon carriers, the surfaces are all positively charged. In the comparative example of the present invention, a positively charged commercial XC-72 is used to make a catalyst and a membrane electrode. That is, in the comparative example, the surface of the catalyst carbon support or the additionally doped carbon support is positively charged. The preparation method of Comparative Examples 1 to 3 is the same as that of Example 2, and the difference lies in that the carbon support and / or doped carbon support of the platinum carbon catalyst used in Comparative Examples 1 to 3 is different from that of Example 2. There are three specific comparative examples:

[0044] 1. The carbon support of the platinum-carbon catalyst in Comparative Example 1 is modified with negative charges (same as Example 2), and the doped carbon support is commer...

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Abstract

The invention discloses a film electrode with ultralow oxygen mass transfer resistance. The film electrode comprises an anode catalyst layer, a proton exchange film and a cathode catalyst layer, wherein catalyst in the cathode catalyst layer is modified by negative charges, and the cathode catalyst layer is also doped with a carbon carrier modified by the negative charges. The film electrode is advantaged in that negative charge modification is carried out on the carbon carrier of the cathode catalyst layer in the film electrode, so distribution of ionomers is optimized to achieve a purpose ofreducing mass transfer resistance of oxygen in cathode catalyst layer, in addition, the concentration of local oxygen near an active site is increased by doping a proper amount of negative charge carbon carriers, and in a word, local mass transfer resistance in the electrode is optimized and performance of the battery is improved by utilizing two means of modifying negative charges and doping thenegative charge carbon carriers.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a membrane electrode with ultra-low oxygen mass transfer resistance. Background technique [0002] The membrane electrode composed of cathode, anode and proton exchange membrane is an important part of proton exchange membrane fuel cell. In the cathode catalyst layer, the ionic polymer Nafion and the catalyst form a porous structure, oxygen passes through the pores and the Nafion layer, and reacts on the platinum surface. Therefore, reducing the mass transfer resistance of oxygen in the cathode catalytic layer can reduce the amount of catalyst platinum and thus reduce production costs. At present, platinum catalysts used in proton exchange membrane fuel cells usually use carbon materials as supports, and different catalyst carbon supports will affect the mass transfer resistance of the catalytic layer. At present, the commonly used common carbon supports have positive charge...

Claims

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Application Information

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IPC IPC(8): H01M8/1004H01M4/92
CPCH01M8/1004H01M4/926H01M2008/1095Y02E60/50H01M2004/8689H01M4/881H01M4/8828
Inventor 魏光华刘昱彤王超章俊良程晓静
Owner SHANGHAI JIAO TONG UNIV
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