Preparation method of fuel cell platinum alloy catalyst

Abstract

The invention relates to a preparation method of a novel fuel cell low-platinum alloy catalyst, which comprises the following steps: adding platinum acetylacetonate (II), hydrated zinc acetylacetonate and polyvinylpyrrolidone into a mixed solution of benzyl alcohol and acetaldehyde, heating to 160-200 DEG C, preserving heat for 8-10 hours, cooling to room temperature, centrifuging, washing, drying at 60 DEG C overnight, and loading on ketjen black. The concave Pt-Zn nanocube has a high-index platinum crystal face, so that the adsorption energy of OH * / O * on the Pt surface can be reduced. Moreover, the anti-Fenton zinc and the platinum-rich surface engineering have a good synergistic effect, the mass activity of 1.18 mA [mu] g Pt <-1 > is achieved, and the specific activity of 3.89 mA cm <-2 > is achieved under 0.9 V (relative to RHE). The H2-O2 fuel cell assembled by the catalyst has ultrahigh peak power density of 1449 mW cm <-2 >, and the performance of the H2-O2 fuel cell is superior to that of commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterial chemistry and electrochemistry, and in particular relates to a preparation method of a novel fuel cell low-platinum alloy catalyst and its application in improving the performance of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) are an attractive and highly efficient alternative to Huaneng Energy's combustion (J. Tollefson, Nature 2010, 464, 1262.). However, the sluggish kinetics of the cathodic oxygen reduction reaction (ORR) and platinum (Pt)-based materials as the most active and stable ORR catalysts are the reasons that severely hinder its commercialization (S. Guo, S. Zhang, S. Sun , Angew. Chem. Int. Ed. 2013, 52, 8526.). But platinum's low earth reserves and high cost prevent its widespread use. Platinum-based metal-transition metal (Pt-M), especially catalysts combined with 3d transition metals (Fe, Ni,...

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Problems solved by technology

However, so far, there has been no clear design of an efficient Pt-Zn-based ORR catalyst employing ultrathin Pt surfaces and high-index multifaceted synergy.

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