A method for catalyst dealloying

A dealloying and catalyst technology, applied to electrochemical generators, fuel cells, structural parts, etc., can solve the problems of waste, inability to take out, and processing capacity of only mg level, so as to improve activity and stability, and improve utilization The effect of efficiency and convenient recycling

Active Publication Date: 2020-12-08
SUZHOU HYDROGINE POWER TECH CO LTD
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Problems solved by technology

The general electrochemical dealloying method cannot be used for large-scale powder dealloying, and can only be applied to bulk materials such as plate, tube, and line with extremely low surface area, or to prepare a small amount of powder into a similar Dealloying after low specific surface area materials; not suitable for removal of chemically inert components such as Cu
[0003] In the field of membrane electrodes (MEA for short), electrochemical dealloying can only be prepared by mixing alloy catalysts and polymer electrolytes on the electrodes used for electrical analysis for half-cell testing. After the test is completed, the dealloying catalyst cannot be taken out for use. It is used for the preparation of MEA, and the conventional processing capacity is only in mg order, resulting in a lot of waste

Method used

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  • A method for catalyst dealloying
  • A method for catalyst dealloying
  • A method for catalyst dealloying

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Experimental program
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Effect test

preparation example Construction

[0024] S2, the preparation of catalyst film, the catalyst solution in step S1 is obtained catalyst film on a conductive inert electrode by filtering or coating; when filtering, the filtration efficiency is accelerated by means of pressurization; the mode of coating can be Use ultrasonic spraying technology or direct manual coating; the inert electrode can be one of carbon paper, carbon cloth, and porous titanium mesh.

[0025] S3, the catalyst film is dealloyed, and the catalyst film in step S2 is dealloyed by electrochemical means to obtain a dealloyed catalyst film, and the time for the electrochemical process is between 1 min and 1 h, preferably between 5 min and 30 min. ; The electrochemical method is to apply voltage or current in acidic solution for alloying treatment. The applied voltage can be cycle voltage, square wave, constant voltage, pulse voltage, and the applied current can be cycle current, constant current, pulse current. Voltage and current can be used accord...

Embodiment 1

[0027] Embodiment 1: Electrochemical dealloying treatment to PtCo alloy catalyst

[0028] The first step is to prepare a catalyst thin film. Take 0.6g of PtCo catalyst powder and add 100mL of water and ethanol mixture into a small glass bottle (v water / v alcohol = 1 / 4), disperse in a high-speed shear emulsifier for 15min (speed 8000rpm), and then filter Put an effective area of ​​50cm 2 carbon paper, under a pressure of 0.05Mpa, the alloy catalyst feed liquid is filtered to form a filter membrane (catalyst film), and when there is basically no solution on the surface of the membrane, the filter is stopped, and then 200mL deionized water is added to repeat the filter operation, and so repeated three times, the loaded The carbon paper of the catalyst thin film is taken out.

[0029] In the second step, electrochemical dealloying is performed on the catalyst. Put the carbon paper loaded with the catalyst film into the electrochemical cell, slowly add 0.5M H along the container...

Embodiment 2

[0036] Embodiment 2: to the electrochemical dealloying treatment of PtCuNi alloy catalyst

[0037] The first step is to prepare a catalyst thin film. Take 0.6g of PtCuNi catalyst powder, add water and ethanol mixture 100mL (v water / v alcohol = 1 / 4) in a small glass bottle, disperse under the high-speed shear emulsifier for 15min (rotating speed 8000rpm), and then on a filter device Put an effective area of ​​50cm 2 carbon paper, under a pressure of 0.05Mpa, the catalyst feed liquid is filtered to form a filter membrane (catalyst film), and the filter is stopped when there is substantially no solution on the surface of the membrane. Then add 200mL of deionized water to repeat the filtration operation, repeat this three times, and take out the carbon paper loaded with the catalyst film.

[0038] In the second step, electrochemical dealloying is performed on the catalyst. Put the carbon paper loaded with the catalyst film into the electrochemical cell, slowly add 0.5M H along ...

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Abstract

The invention relates to a catalyst dealloying method, which comprises the following steps: S1, uniformly dispersing the alloy catalyst powder in a solution composed of deionized water and an organicsolvent to form a catalyst solution; S2, the catalyst solution is filtered or coated on an electrically conductive inert electrode to obtain a catalyst film; S3, electrochemically dealloying the catalyst film of step S2 to obtain a dealloyed catalyst film; S4, stripping the obtained catalyst film from the inert electrode to form catalyst powder, purifying the catalyst powder, and performing dryingto obtain the dealloyed catalyst powder. The method can improve the magnitude of dealloying and effectively remove the excess alloy component in the catalyst powder, thereby effectively improving theactivity and stability of the catalyst powder and facilitating the recovery of the catalyst powder for testing.

Description

technical field [0001] The invention relates to the production and manufacture of fuel cell catalysts, in particular to a catalyst dealloying method. Background technique [0002] The slow oxidation-reduction process of the proton exchange membrane fuel cell cathode is one of the main reasons for the decrease in the efficiency of the battery system, and in order to improve the activity of the catalyst, it is necessary to dealloy the catalyst. The general electrochemical dealloying method cannot be used for large-scale powder dealloying, and can only be applied to bulk materials such as plate, tube, and line with extremely low surface area, or to prepare a small amount of powder into a similar The low specific surface area material is then dealloyed; it is not suitable for the removal of chemically inert components such as Cu. [0003] In the field of membrane electrodes (MEA for short), electrochemical dealloying can only be prepared by mixing alloy catalysts and polymer el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M8/1004H01M10/42
CPCH01M4/88H01M8/1004H01M10/42H01M10/4242Y02E60/10Y02E60/50
Inventor 米诗阳吴丹范书琼王秀张晓华朱威
Owner SUZHOU HYDROGINE POWER TECH CO LTD
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