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Cathode catalyst for proton membrane fuel cell

A fuel cell cathode and catalyst technology, which is applied in the field of materials in the field of electrochemical technology, can solve the problems of battery performance degradation, lack of consideration of oxygen mass transfer rate, slow oxygen mass transfer rate, etc., to improve performance and increase oxygen reduction catalysis efficiency, reducing the effect of electrochemical polarization

Inactive Publication Date: 2006-07-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent, how to increase the mass transfer rate of oxygen is not considered, especially for fuel cells, the slowness of oxygen mass transfer rate is the main reason for the degradation of battery performance at high current densities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] According to Zr 1-x m x o 2 X = 0.1 ratio to get Zr 0.9 Fe 0.1 o 2 powder, meanwhile, the catalyst was obtained according to the ratio of molar ratio Pt:M=1:1. The specific method is: dissolve 100 grams of citric acid in 200 grams of water, add 8.08 grams of ferric nitrate and 58.01 grams of oxychloride pick respectively, place them on a magnetic stirrer and stir them thoroughly, then add 12.41 grams of ethylene glycol, and heat and volatilize to remove moisture. The crystal precursor obtained after volatile moisture is placed in a high-temperature furnace, and in an air atmosphere, the temperature is raised at a heating rate of 5°C / min, and it is fired at a constant temperature of 450°C for 300 minutes, and then naturally cooled to room temperature to obtain a particle size between 10-20nm. Intermediate brown Zr 0.9 Fe 0.1 o 2 powder. Put Zr 0.9 Fe 0.1 o 2 The powder and 20% Pt / C from Johnson Mattey Company are mixed according to the ratio of molar ratio P...

Embodiment 2

[0013] According to embodiment 1, the brown powder Zr with particle diameter between 10-20nm is obtained 0.9 Fe 0.1 o 2 , and then according to the ratio of molar ratio Pt:M=1:5 and 20% Pt / C after uniform mixing, the catalyst of the present invention can be obtained. Then the catalyst was mixed with 5% Nafion solution at a mass ratio of 4:1, and then coated on a graphite sheet to make a working electrode. In the three-electrode system, the metal platinum sheet is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, 0.5MH 2 SO 4 As the electrolyte, the cyclic voltammetry test is carried out in the voltage range of -0.3V ~ 1V. The results show that the oxygen reduction current density of the catalyst prepared by the invention doubles that of the commonly used Pt / C, while the loading of Pt is reduced by half, which is expected to meet the practical requirements of proton exchange membrane fuel cells.

Embodiment 3

[0015] According to this embodiment, Zr 1-x m x o 2 X = 0.5 ratio to get Zr 0.5 Fe 0.5 o 2 Powder, at the same time, according to the ratio of molar ratio Pt: M = 1: 3 to obtain the catalyst. The specific method is: dissolve 100 grams of citric acid in 200 grams of water, add 40.4 grams of ferric nitrate and 32.23 grams of oxychloride pick respectively, place them on a magnetic stirrer and stir thoroughly, then add 12.41 grams of ethylene glycol, and heat and volatilize to remove moisture. Press the sintering method of embodiment 1, obtain the brown powder Zr that particle size is between 10-20nm 0.5 Fe 0.5 o 2 , and then according to the ratio of molar ratio Pt:M=1:3 and 20% Pt / C after uniform mixing, the catalyst of the present invention can be obtained. Then the working electrode was made according to the method of Example 2, and the cyclic voltammetry test was carried out in the voltage range of -0.3V~1V in the three-electrode system. The results show that the ox...

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Abstract

The invention discloses a cathode catalyst of proton film fuel battery in the electrochemical technique domain, which is characterized by the following: each composition and weight percentage is 1-50 percent Pt, 20-80 percent Zr1-xMxO2 and 10-50 C, wherein the x is mole rate between 0.1 and 0.5; the catalyst making method comprises the following steps: adapts soft chemical method to synthesize nanometer-level Zr1-xMxO2; mixing the nanometer-level Zr1-xMxO2 with nanometer-level Pt / C at mole rate of Pt:M=1:1-5. The invention reduces the electrochemical polarization, Ohm polarization and mass tr ansfer polarization effectively, which increases the catalytic efficiency to improve the battery property.

Description

technical field [0001] The invention relates to a material in the technical field of electrochemistry, in particular to a proton membrane fuel cell cathode catalyst. Background technique [0002] Most of the current proton membrane fuel cell cathode catalysts use different percentages of carbon-supported platinum (Pt / C), the weight percentage of Pt is generally between 10-60%, and the amount of platinum is generally 0.4mg / cm 2 about. In order to promote the practical process of proton membrane fuel cells as soon as possible, the currently proposed cathode catalyst research goal is: the platinum loading is a quarter of the current one, while the performance of the battery does not decline. That is to say, the current platinum load must be reduced from 0.4mg / cm2 to 0.1mg / cm2. [0003] Found through literature retrieval to prior art, U.S. Patent No. 5876867, patent name is (Platinumskeleton alloy-supported electrocatalyst, electrode using the electrocatalyst, and process for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/20B01J23/42B01J21/06H01M4/90H01M8/00H01M8/0202
CPCY02E60/50Y02P70/50
Inventor 余晴春屠恒勇
Owner SHANGHAI JIAO TONG UNIV
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