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Method for preparing carbon-supported core-shell compact copper iron-copper-platinum catalyst for fuel cell

A fuel cell and platinum catalyst technology, applied in the field of electrochemistry, can solve the problems of inability to form lattice stress, expensive palladium, limited activity, etc., and achieve the effects of improving utilization and stability, promoting further development, and reducing preparation costs.

Active Publication Date: 2019-02-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At 40,000 potential cycles (0.65 to 1.05 volts, 100mVs -1 ), the fuel cell performance of the Pd@Pt core-shell catalyst was significantly improved (at 600mA cm -2 70mV), and the mass activity is 4.5 times that of commercial platinum-carbon catalysts, but the price of palladium as the core is relatively expensive, and the lattice mismatch with platinum is small, and suitable lattice stress cannot be formed, which limits the further improvement of activity
[0006] Using a proprietary method, Ball et al. deposited platinum (Pt) shells on Pd-Co alloy nanoparticles and achieved 0.7Amg -1 The quality activity, the improvement of activity is due to the transition metal doping into the core of palladium, fine-tuning the electronic structure of platinum, and the transition metal with smaller particle size in the structure forms an alloy with platinum in the sub-surface layer, which improves the activity and stability , but the cobalt atom is relatively active and easily dissolved in an acidic environment, destroying the structure of the catalyst, and the simple core-shell structure can no longer meet the stability requirements of fuel cells

Method used

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  • Method for preparing carbon-supported core-shell compact copper iron-copper-platinum catalyst for fuel cell
  • Method for preparing carbon-supported core-shell compact copper iron-copper-platinum catalyst for fuel cell
  • Method for preparing carbon-supported core-shell compact copper iron-copper-platinum catalyst for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Weigh 80mg of activated carbon powder and place it in a conical flask, add 40ml of ethylene glycol (EG), ultrasonically disperse at room temperature for 1h, and then add soluble copper with a concentration of 20g / L under magnetic stirring Salt (analytical pure copper chloride or analytical pure copper nitrate) in ethylene glycol solution and iron salt (analytical pure ferric chloride or analytical pure ferric nitrate) in ethylene glycol solution, so that carbon, copper ions and iron ions in the mixed solution The mass ratio of 80:17:3, magnetic stirring 1h;

[0056] (2) Use 2M potassium hydroxide solution dissolved in ethylene glycol to adjust the pH of the above mixed solution to 10. After a period of stabilization, add 20 mL of ethylene glycol solution dropwise under nitrogen protection and strong stirring. Alcohol Sodium Borohydride (NaBH 4 , 2M) solution, the reaction time is 1h, to obtain carbon-loaded copper-iron alloy slurry;

[0057] (3) With the carbon-su...

Embodiment 2

[0062] (1) Weigh 70 mg of activated carbon powder and place it in a conical flask, add 40 ml of ethylene glycol (EG), ultrasonically disperse at room temperature for 1 h, and then add soluble copper with a concentration of 20 g / L under magnetic stirring Salt (analytical pure copper chloride or analytical pure copper nitrate) in ethylene glycol solution and iron salt (analytical pure ferric chloride or analytical pure ferric nitrate) in ethylene glycol solution, so that carbon, copper ions and iron ions in the mixed solution The mass ratio of 80:15:2, magnetic stirring 1h;

[0063] (2) Adjust the pH of the above mixed solution to 10 with a concentration of 2M potassium hydroxide solution dissolved in ethylene glycol. After a period of stability, under nitrogen protection and strong stirring, add 17ml of ethylene glycol solution dropwise. Alcohol Sodium Borohydride (NaBH 4 , 2M) solution, the reaction time is 1h, to obtain carbon-loaded copper-iron alloy slurry;

[0064] (3) W...

Embodiment 3

[0069] (1) Weigh 65g of activated carbon powder and place it in a conical flask, add 40ml of ethylene glycol (EG), ultrasonically disperse at room temperature for 1h, then add soluble copper with a concentration of 20g / L under magnetic stirring Salt (analytical pure copper chloride or analytical pure copper nitrate) in ethylene glycol solution and iron salt (analytical pure ferric chloride or analytical pure ferric nitrate) in ethylene glycol solution, so that carbon, copper ions and iron ions in the mixed solution The mass ratio of 70:15:3, magnetic stirring 1h;

[0070] (2) Use 2M potassium hydroxide solution dissolved in ethylene glycol to adjust the pH of the above mixed solution to 10. After a period of stability, under nitrogen protection and strong stirring, add 18 mL of ethylene glycol solution dropwise. Alcohol Sodium Borohydride (NaBH 4 , 2M) solution, the reaction time is 1h, to obtain carbon-loaded copper-iron alloy slurry;

[0071] (3) With the carbon-supported ...

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Abstract

The invention relates to a method for preparing a carbon-supported core-shell compact copper iron-copper-platinum catalyst for a fuel cell, and belongs to the technical field of electrochemistry. Themethod comprises the following steps: (1) preparing a copper iron mixed liquid; (2) preparing a carbon-supported copper iron alloy slurry; (3) preparing carbon-supported copper iron-copper core-shellparticles; (4) preparing a carbon-supported copper iron-copper-platinum core-shell catalyst slurry; (5) preparing carbon-supported copper iron-copper-platinum core-shell particles; and (6) preparing the surface compact core-shell carbon-supported copper iron-copper-platinum catalyst. The catalyst has the advantages of low platinum load, good catalytic activity, high chemical stability and the like, and promote further development of fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a carbon-supported three-layer core-shell dense copper-iron-copper-platinum catalyst (Cu-Fe@Cu@Pt) for a fuel cell, which belongs to the technical field of electrochemistry. technical background [0002] Proton exchange membrane fuel cells (PEMFCs) are devices that directly convert chemical energy into electrical energy. Due to their high efficiency and environmental protection, they have received extensive attention in recent years. However, the lack of resources and high price of platinum in battery materials restrict the commercialization of proton exchange membrane fuel cells (PEMFCs). [0003] At the anode of proton exchange membrane fuel cells (PEMFCs), hydrogen is oxidized to generate electrons and hydrogen ions, which are transferred to the cathode through an external circuit and the PEM, respectively. At the cathode, oxygen is reduced by reacting with hydrogen ions and electrons to form water. ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/92
CPCH01M4/8657H01M4/88H01M4/921H01M4/926Y02E60/50
Inventor 朱红曹季冬
Owner BEIJING UNIV OF CHEM TECH
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