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A kind of preparation method of ferromagnetic fuel cell cathode electrocatalyst

A fuel cell cathode and electrocatalyst technology, applied to battery electrodes, circuits, electrical components, etc., to achieve the effect of improving activity and increasing oxygen flux

Active Publication Date: 2016-12-28
氢电中科(广州)新能源设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current literature and published Chinese invention patents have not retrieved the preparation method of using ferromagnetic electrocatalyst as fuel cell oxygen reduction catalyst, so this patent has obvious innovation

Method used

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  • A kind of preparation method of ferromagnetic fuel cell cathode electrocatalyst
  • A kind of preparation method of ferromagnetic fuel cell cathode electrocatalyst
  • A kind of preparation method of ferromagnetic fuel cell cathode electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step (1) is exactly the same as Comparative Example 1.

[0028] (2) The carbon-supported fuel cell electrocatalyst (PtFe / C) prepared in step (1) was heat-treated at 700 °C for 2 hours in an Ar atmosphere, and the heating rate was 10 °C / min from room temperature to 700 °C, and then cooled to room temperature in the furnace to obtain Ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-700), wherein the mass percentage of the active metal component PtFe in the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-700) is 20%.

[0029] Magnetic performance test: from figure 1 It can be seen that the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-700) prepared in Example 1 has a very obvious hysteresis loop, so it is an obvious ferromagnetic catalyst.

[0030] Catalytic performance test: from figure 2 It can be seen from the curve b in the figure that the oxygen reduction current density of the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-700) pr...

Embodiment 2

[0034] Step (1) is exactly the same as Comparative Example 2.

[0035] (2) The carbon-supported fuel cell electrocatalyst (PtFe / C) prepared in step (1) was heat-treated in an Ar atmosphere at 800°C for 40 minutes, from room temperature to 800°C at a heating rate of 10°C / min, and then cooled in the furnace to room temperature to obtain Ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-800), wherein the mass percentage of the active metal component PtFe in the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-800) is 40%.

[0036] Magnetic test and catalytic performance test: After testing, the carbon-supported fuel cell electrocatalyst (PtFe / C) prepared in Comparative Example 2 is a superparamagnetic catalyst, while the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-800 ) is a ferromagnetic catalyst; the oxygen reduction current density of the ferromagnetic fuel cell cathode electrocatalyst (PtFe / C-800) prepared in Example 2 is 20mA / mg Pt (0.6V), compared w...

Embodiment 3

[0042] Step (1) is exactly the same as Comparative Example 2.

[0043] (2) The electrocatalyst prepared in step (1) was 2 Heat treatment at 800°C in the atmosphere for 1 hour, the temperature rise rate from room temperature to 800°C is 10°C / min, and then cool in the furnace to room temperature to obtain a ferromagnetic fuel cell cathode electrocatalyst (PtCo / C-800), in which the active metal component PtCo is in the iron The mass percentage in the cathode electrocatalyst (PtCo / C-800) of the magnetic fuel cell is 30%.

[0044] Magnetic performance test: from image 3 It can be seen that the ferromagnetic fuel cell cathode electrocatalyst (PtCo / C-800) prepared in Example 3 has an obvious hysteresis loop, so it is a ferromagnetic catalyst.

[0045] Catalytic performance test: The oxygen reduction current density of the ferromagnetic fuel cell cathode electrocatalyst (PtCo / C-800) prepared in Example 3 is 6mA / mg Pt (0.6V), which is 50% higher than that in Comparative Example 3.

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Abstract

The invention discloses a method for preparing an electrocatalyst for a cathode of a ferromagnetic fuel cell. The method comprises: preparing a carbon-carried fuel cell electrocatalyst by a general impregnation reduction, treating the carbon-carried fuel cell electrocatalyst in inert atmosphere under certain heat treatment conditions, regulating and changing ferromagnetic performances of the catalyst, and applying the catalyst in an oxygen reduction reaction of the cathode of the fuel cell. The prepared electrocatalyst for the ferromagnetic fuel cell when used in the oxygen reduction reaction of the cathode, because of special superparamagnetism of oxygen molecules, increases oxygen flux, thereby raising oxygen reduction activity. The property of the ferromagnetic oxygen reducing catalyst prepared by the method, compared with that of a non-ferromagnetic catalyst, is raised for 50-300% (0.6V oxygen reduction current density). The method has advantages of simple and fast preparation technology, low cost, and easy realization of batch and industrialization production.

Description

technical field [0001] The invention belongs to the field of fuel cell cathode electrocatalysts, and in particular relates to a preparation method of ferromagnetic fuel cell cathode electrocatalysts. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy into electrical energy through electrode reaction without chemical combustion. As a new type of chemical power source, fuel cells have become the fourth power generation method after thermal power, hydropower and nuclear power. Fuel cells are highly valued by countries all over the world, and countries have invested heavily in research and development in order to realize their commercialization and popularization. [0003] In fuel cells, electrocatalysts play the role of electrochemical reaction "factories" and are the core materials in batteries. The development of electrocatalysts is one of the keys to fuel cells. Due to the slow kinetic process of cathode oxygen red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCY02E60/50
Inventor 曾建皇韩明家廖世军夏建伟
Owner 氢电中科(广州)新能源设备有限公司
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