Preparation method and application of Fe and Co bimetallic doped mesoporous carbon oxygen reduction catalyst

Abstract

The invention discloses a preparation method and application of a Fe and Co bimetallic doped mesoporous carbon oxygen reduction catalyst. The method comprises the following steps: dissolving 2-methylimidazole in a methanol solution to obtain a solution named as a solution A; dissolving zinc nitrate hexahydrate in a methanol solution to obtain a solution named as a solution B; and adding the solution B into the solution A under a stirring condition, stirring at room temperature to obtain white turbid liquid ZIF-8, adding ferric acetylacetonate and cobalt acetylacetonate into the turbid liquid ZIF-8, stirring, transferring into polytetrafluoroethylene for hydrothermal reaction, centrifuging, washing, drying and carrying out heat treatment on the obtained product to obtain the catalyst. The method is low in preparation cost, simple in process and capable of being repeatedly operated, and the problem of agglomeration in the pyrolysis process of the catalyst is solved; the catalyst is high in loading capacity and has good catalytic activity and stability, the half-wave potential reaches 0.81 V under the acidic condition, and the half-wave potential is 88.6% after a timing current test for 40000s.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to the preparation of a Fe, Co bimetallic doped ZIF-8 derived carbon-oxygen reduction catalyst and its application in proton exchange membrane fuel cell cathodes. Background technique [0002] Energy shortage and environmental pollution are two major problems that human society needs to solve urgently. Therefore, it is urgent to develop new, clean, efficient and sustainable energy sources to replace traditional fossil energy sources. Among many new energy sources, fuel cells are considered to be the most promising form of production capacity in the 21st century because of their advantages such as high efficiency, environmental protection, and unlimited sources of reactants. However, the cathode oxygen reduction reaction rate of the fuel cell is very slow. Although the Pt / C catalyst used has good activity, the high price, limited reserves, insufficient durability and p...

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Problems solved by technology

[0004] The present invention provides a Fe, Co bimetallic doped ZIF-8 derived carbon-oxygen reduction catalyst and its preparation method and application, using 2-methylimidazole and zinc nitrate hexahydrate as raw materials to synthesize a ZIF-8 carrier precursor, Synthesis of Fe, Co bimetallic co-doped ZIF-8 derived carbon-oxygen reduction catalyst by hydrothermal method, which solves the problems of a large amount of agglomeration of the catalyst precursor during the pyrolysis process and low loading of a single metal catalyst; the invention prepared The catalyst particle size is uniform, the catalyst loading is high, and it has good catalytic activity and stability. Under acidic conditions, the half-wave potential has reached 0.81V (vs. RHE), and after 40000s of chronoamperometric testing, it is 88.6% (mass activity only Attenuation of 11.4%, much lower than commercial Pt / C activity attenuation (65.6%)

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