Oxygen reduction catalyst for fuel cell and preparation method thereof

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...

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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

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