A method for mass-preparing platinum-based dealloyed electrocatalysts for fuel cell cathodes

A fuel cell cathode and alloy catalyst technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as increased production costs and complicated operations, and achieve the effects of reducing platinum loss, increasing specific activity, and reducing energy consumption

Active Publication Date: 2018-02-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the dealloying operation is to put the alloy catalyst directly into strong acid or strong alkali for dealloying treatment, and then put it into deionized water for washing. This method requires the use of a large amount of acid, lye and deionized water. The process also involves solid-liquid separation, which not only complicates the operation, but also increases the production cost

Method used

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  • A method for mass-preparing platinum-based dealloyed electrocatalysts for fuel cell cathodes
  • A method for mass-preparing platinum-based dealloyed electrocatalysts for fuel cell cathodes

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Get 1g Pt1Ni1 / C commercial catalyst (purchased from Premetek company) and place as figure 1 The microporous silica plate of the device shown has a pore diameter of 0.05-0.1 μm and a plate thickness of 0.3 cm. 3 Inside the hydrothermal reactor, microporous silica plate and concentrated HNO 3 The liquid surface distance is 10 cm, and the lid is tightly closed; the hydrothermal reaction kettle is put into an oven, the set temperature is kept at 80°C, and the reaction time is 3 hours;

[0018] (2) After the reaction is completed, remove the reactor from the oven and cool to room temperature, pour out the concentrated HNO at the bottom of the reactor 3 , and add 20mL of deionized water, so that the distance between the liquid surface of deionized water and the microporous silicon oxide plate is 10 cm, close the lid tightly, put it into the oven, set the temperature at 110°C, and last for 2 hours; follow the above operation to use Ionized water thoroughly cleaned the pr...

Embodiment 2

[0022] (1) Weigh 80mg of XC-72R carbon black into a four-necked bottle, add 40ml of ethylene glycol (EG) and sonicate for 1 hour; mix well and add 50mg of CuSO 4 ·5H 2 O, 38 mg H 2 PtCl 6 ·6H 2 Dilute with 0 and 20ml EG, stir magnetically for 1 hour to fully dissolve the solid; adjust the pH of the above solution to 10.0 with 1mol / L KOH / EG solution, and stabilize it for 30 minutes; then transfer the above mixed solution to a microwave reactor, and pass N 2 10min to remove the air in the solution, set the microwave power to 600W, heat at 190°C for 10min; after cooling to room temperature, centrifuge and wash until free of Cl － In the presence of other heteroions, freeze-dry for 12 hours, the resulting solid is the Pt1Cu1 / C alloy catalyst;

[0023] (2) get the Pt1Cu1 / C catalyst synthesized in 1g step (1) and place it in such as figure 1 The microporous silica plate of the device shown has a pore diameter of 0.05-0.1 μm and a plate thickness of 0.3 cm, and then the device i...

Embodiment 3

[0027] (1) Weigh 80mg of XC-72R carbon black into a four-necked bottle, add 40ml of ethylene glycol (EG) and sonicate for 1 hour; mix well and add 50mg of CoCl respectively 2 ·6H 2 O, 38 mg H 2 PtCl 6 ·6H 2 Dilute with 0 and 20ml EG, stir magnetically for 1 hour to fully dissolve the solid; adjust the pH of the above solution to 10.0 with 1mol / L KOH / EG solution, and stabilize it for 30 minutes; then transfer the above mixed solution to a microwave reactor, and pass N 2 10min to remove the air in the solution, set the microwave power to 600W, heat at 190°C for 10min; after cooling to room temperature, centrifuge and wash until free of Cl － In the presence of other hetero ions, freeze-dry for 12 hours, and the resulting solid is the Pt1Co1 / C alloy catalyst.

[0028] (2) Get the Pt1Co1 / C catalyst synthesized in 1g step (1) and place it as figure 1The microporous silica plate of the device shown has a pore diameter of 0.05-0.1 μm and a plate thickness of 0.3 cm. 3 Inside th...

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Abstract

The invention relates to a method for massively preparing a platinum-based dealloyed electrocatalyst for a cathode of a fuel cell, and belongs to the technical field of electrochemistry and new energy. According to the method, dealloying treatment is carried out by acid vapor; direct contact of a catalyst solid and an acid liquid is avoided; and solid-liquid separation operation is omitted. The dealloyed electrocatalyst prepared by the method has a core-shell structure, improves the utilization rate and the specific activity of noble metal platinum are improved and improves the stability. The preparation method reduces the acid consumption and washing water, and reduces platinum loss in the dealloying process. In addition, use of stirring equipment is also avoided in the preparation process; and the energy consumption is reduced. The preparation method provided by the invention is suitable for massive production of the low-platinum electrocatalyst; the problem of massive preparation of the low-platinum electrocatalyst can be effectively solved; and application of the low-platinum electrocatalyst in the fuel cell is promoted, so that the commercialization process of the fuel cell is promoted.

Description

technical field [0001] The invention relates to a method for preparing an electrocatalyst for a fuel cell cathode, in particular to a method for preparing a platinum-based dealloyed electrocatalyst in batches, and belongs to the technical fields of electrochemistry and new energy. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. At present, the main obstacles limiting its commercialization process are high cost and short lifespan. One of the main reasons for its high cost is the dependence of the electrode catalyst material of the fuel cell on the noble metal platinum. Therefore, much research has been devoted to reducing the platinum loading required in fuel cell electrodes. Studies have shown that the core-shell structure catalyst has higher catalytic activity and larger electrochemical active area than pure platinum, which can reduce the required platinum loading. [0003] US20100197...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/88H01M4/8817H01M4/92Y02E60/50
Inventor 朱红骆明川
Owner BEIJING UNIV OF CHEM TECH
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