Alkaline oxygen reduction reaction catalyst, preparation method and application thereof

Abstract

The invention relates to an alkaline oxygen reduction reaction catalyst, a preparation method and application thereof. The catalyst is a carbon-supported spinel material and comprises a carbon carrierand spinel supported on the carbon carrier, wherein metal cations in the spinel comprise manganese and cobalt, and the carbon carrier and the spinel have a synergistic effect, so that the activity ofthe catalyst for catalyzing the oxygen reduction reaction is significantly improved compared with the activity of the catalyst for catalyzing the oxygen reduction reaction only by using the spinel ora single carbon carrier. When the alkaline oxygen reduction reaction catalyst is used for the alkaline oxygen reduction reaction, the half-wave potential of the alkaline oxygen reduction reaction catalyst can reach 0.872V at most.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to an alkaline oxygen reduction reaction catalyst and its preparation method and application. Background technique [0002] Alkaline non-noble metal oxygen reduction catalysts are one of the research focuses in the fields of alkaline membrane fuel cells and metal-air batteries. Non-noble metal materials such as nitrogen-doped carbon and transition metal oxides have been proven to have good oxygen Reduction catalytic activity (see literature K. Gong, et al. Science, 2009, 323, 760; W. T. Hong, et al. Energy Environ. Sci., 2015, 8, 1404). Among them, nitrogen-doped carbon and perovskite materials need to be calcined at high temperature to obtain good structural stability and catalytic activity (see literature H.Ren, et al.ACS Catal., 2017, 7, 6485; J.Suntivich, et al.Nat.Chem.,2011,3,546), therefore, nitrogen-doped carbon and perovskite materials have high energy consumption in th...

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Problems solved by technology

[0004] CN102082270A discloses a preparation method of a class of manganese spinel nanomaterials, including Co x mn 3-x o 4 , MgMn 2 o 4 , Mn 3 o 4 Nanoparticles, ZnMn 2 o 4 Hollow nanospheres, hollow microspheres or nanosheets, which are prepared by reducing MnO 2 Reduction; although this scheme can prepare manganese-cobalt spinel and control the microscopic morphology of the product, it cannot effectively control the element distribution on the surface of the prepared manganese-cobalt spinel nanoparticles, and the catalytic oxygen reduction Insufficient activity

[0005] CN104810518A discloses a cobalt-manganese series spinel nanomaterial and a preparation method thereof, the chemical general formula of the cobalt-manganese series spinel nanomaterial is Co 3-x mn x o 4 , where 1≤x≤2, including cubic phase nanoparticles and tetragonal phase nanoparticles, the particle size of the nanoparticles is 5-15nm, and the molar ratio of Co to Mn is 0.4-2.2:1; the preparation method is: Under normal pressure air atmosphere, the two-step method of oxidation precipitation and embedded crystallization is used to control the crystal phase and composition, so as to obtain cobalt-manganese spinel nanomaterials. Although this method can prepare cobalt-manganese spinel nanomaterials, However, the activity of catalyzing basic oxygen reduction is insufficient, and the distribution of elements in the catalyst preparation process is difficult to control

[0006] CN108636422A discloses a manganese-cobalt spinel catalyst and a preparation method thereof, the method comprising the following steps: (1) mixing a manganese salt and a cobalt salt and performing the first grinding treatment to obtain mixed salt powder; (2) mixing The mixed salt powder is mixed with microporous ceramics, diluent and water for a second grinding treatment and aging to obtain a compound intermediate; (3) drying the compound intermediate to obtain a precursor; ( 4) Roasting the precursor to obtain the manganese-cobalt spinel catalyst; the method described in this scheme cannot effectively regulate the distribution of elements on the surface of the manganese-cobalt spinel, and the manganese-cobalt spinel prepared by it Insufficient catalyst activity for catalyzing oxygen reduction

[0007] Although the above-mentioned documents disclose some basic oxygen reduction reaction catalysts and their preparation methods, there is still the problem of insufficient activity of a single manganese-cobalt spinel as a basic oxygen reduction reaction catalyst. Therefore, a highly active basic oxygen reduction reaction catalyst has been developed. Reduction reaction catalysts and their preparation methods are still of great significance

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