Oxygen reduction catalyst for fuel cell and preparation method thereof

A fuel cell and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of increasing the manufacturing cost of oxygen reduction catalysts, hindering the commercial production of fuel cells, and complex synthesis processes. The effect of shortening the preparation time, strong controllability of the preparation process and mild preparation conditions

Inactive Publication Date: 2008-11-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are obvious deficiencies in the above-mentioned metalloporphyrin and metallophthalocyanine fuel cell oxygen reduction catalysts and their preparation methods: due to the use of macrocyclic ligands as raw materials, such as porphyrin, substituted porphyrin, phthalocyanine, substituted titanium cyanine Or polymerized phthalocyanine, so the synthesis steps of its raw materials are cumbersome, the synthesis process is complex, the side reactions are many, the yield is low, and the raw material cost of synthesizing the macrocyclic ligand is high, these will greatly increase the manufacturing cost of the oxygen reduction catalyst, thereby hindering Commercial production of fuel cells

Method used

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  • Oxygen reduction catalyst for fuel cell and preparation method thereof
  • Oxygen reduction catalyst for fuel cell and preparation method thereof
  • Oxygen reduction catalyst for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 0°C, add 40g of absolute ethanol and 0.0806g of cobalt chloride into a 100mL flask, add 0.2g of diethylenetriamine dropwise under stirring to coordinate to obtain cobalt diethylenetriamine chelate, add 0.1g of carbon black carrier Ketjen Black, continued to stir for 120 minutes, evaporated to remove the reaction medium; then under inert gas, heat treatment at 800 ° C for 90 minutes at a high temperature, and then cooled to obtain a carbon-supported cobalt diethylenetriamine as an oxygen reduction catalyst for fuel cells.

[0026] figure 1 It is the fuel cell oxygen reduction catalyst that embodiment 1 obtains in oxygen-saturated 0.5M H 2 SO 4 The electrochemical cyclic voltammetry test was carried out in the solution, and the scanning speed was 5mV / s, 10mV / s, 20mV / s, 30mV / s, 40mV / s and 50mV / s. It can be seen from the figure that with the increase of scanning speed, the peak potential of oxygen reduction shifts negatively, and the peak current increases obviously. ...

Embodiment 2

[0028] At 60°C, add 80g of absolute ethanol and 0.0844g of cobalt acetate to a 100mL flask, add 0.25g of diethylenetriamine dropwise under stirring to coordinate to obtain cobalt diethylenetriamine chelate, and add 0.1g of carbon black carrier Black Pearl 2000, continue to stir for 240 minutes, evaporate and remove the reaction medium; then under inert gas, heat treatment at 800°C for 60 minutes at high temperature, and then cool down to obtain a carbon-supported cobalt diethylenetriamine as an oxygen reduction catalyst for fuel cells.

[0029] figure 2 It is the fuel cell oxygen reduction catalyst that embodiment 2 obtains in oxygen-saturated 0.5M H 2 SO 4 +0.5M CH 3 Cyclic voltammetry curve in OH solution, the scan speed is 5mV / s. The oxygen reduction peak potential reaches 0.714V (vs. NHE), and the oxygen reduction peak current reaches 0.083mA, indicating that the catalyst of the present invention has better oxygen reduction catalytic performance and methanol oxidation ...

Embodiment 3

[0031] At 25°C, add 40g of distilled water and 0.0924g of ferric chloride into a 100mL flask, add 0.25g of diethylenetriamine dropwise under stirring for coordination to obtain iron diethylenetriamine chelate, add 0.3g of carbon black carrier Vulcan XC -72R, continue to stir for 240 minutes, evaporate and remove the reaction medium; then under inert gas, heat treatment at 800°C for 90 minutes at high temperature, and then cool to obtain a carbon-supported iron diethylenetriamine as an oxygen reduction catalyst for fuel cells.

[0032] image 3 It is the fuel cell oxygen reduction catalyst that embodiment 3 obtains in oxygen-saturated 0.5M H 2 SO 4 Cyclic voltammetry curve in solution, the scan rate is 5mV / s. In the figure, there is an obvious characteristic peak of oxygen reduction, the peak potential is 0.706V (vs. NHE), and the peak current is 0.114mA, indicating that the catalyst of the present invention has better catalytic activity for oxygen reduction.

[0033] Figu...

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Abstract

The invention discloses a fuel battery used oxygen reduction catalyst and the preparation method thereof, and relates to a loaded catalyst which is composed of a transition metal chelate and a carbon black carrier, wherein, the transition metal chelate is prepared through the reaction of transition metal salt and diethylene triamine. MN3 structure is included in the molecule of the transition metal chelate (M is transition metal and N is nitrogen atom), and an active site is provided for catalyzing the oxygen reduction reaction. The catalyst takes the diethylene triamine with low cost as the raw material; overcomes the problems of the traditional oxygen reduction catalyst of the macrocyclic compound, such as metalloporphyrin and metal phthalocyanine, that the cost of the raw materials is high, and the traditional oxygen reduction catalyst is not suitable for the large scale production industrial production; and has the advantages of simple preparation technology, mild condition, secure process, low cost, and so on. The catalytic performance of the catalyst is equivalent to the oxygen reduction of the metalloporphyrin, the catalytic has good anti carbinol oxygenic property, and can be applied to the oxygen reduction reaction of the cathode of the battery.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an oxygen reduction catalyst for a fuel cell and a preparation method thereof. Background technique [0002] As a new type of energy conversion device, fuel cell has the advantages of high energy density, no pollution and high specific power, and has become a research hotspot all over the world. Commonly used oxygen reduction catalysts are carbon-supported Pt and Pt alloys, but platinum, as a scarce resource, is expensive, which increases the manufacturing cost of fuel cells. Therefore, it is necessary to find an inexpensive oxygen reduction catalyst to replace platinum and platinum alloys in order to reduce the cost of fuel cells. [0003] At present, the non-precious metal-based oxygen reduction catalysts for fuel cells that have been studied more and have better catalytic activity are mainly transition metal macrocyclic compounds, among which metalloporphyrins an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18H01M4/90
CPCY02E60/50
Inventor 张慧娟马紫峰
Owner SHANGHAI JIAO TONG UNIV
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