Preparation and application of monatomic platinum catalyst based on platinum coordination cyclodextrin inclusion compound

Abstract

The invention relates to a fuel cell catalyst technology, and aims to provide preparation and application of a monatomic platinum catalyst based on a platinum coordination cyclodextrin inclusion compound. The preparation method comprises the following steps of: dissolving [beta]-cyclodextrin in deionized water, then mixing the [beta]-cyclodextrin with a melamine solution, and performing dispersing; performing vacuum drying to obtain a melamine cyclodextrin inclusion compound; taking the melamine cyclodextrin inclusion compound, adding the melamine cyclodextrin inclusion compound into the potassium chloroplatinate solution, and performing stirring to obtain a platinum coordination melamine cyclodextrin inclusion compound solution; then adding sodium metaborate tetrahydrate, and after the sodium metaborate tetrahydrate is completely dissolved, carrying out spray drying to obtain a precursor; carbonizing the precursor under the protection of a nitrogen atmosphere; and performing cooling,washing and drying to obtain a monatomic platinum catalyst. The preparation and application of a monatomic platinum catalyst based on a platinum coordination cyclodextrin inclusion compound are simplein technical route, have universality, and can avoid generation of impure phases. Platinum atoms are fixed by utilizing the strong coordination effect of nitrogen to form a monatomic catalyst, so that the monatomic catalyst has the higher electrocatalytic activity, and the cost of the fuel cell catalyst can be effectively reduced.

Description

technical field [0001] The present invention relates to a kind of fuel cell catalyst technology, more specifically, relates to a kind of using melamine as a ligand, using cyclodextrin as a block molecule to isolate platinum ions, and synthesizing a platinum coordination cyclodextrin inclusion complex as a precursor , a single-atom platinum catalyst prepared using sodium metaborate as a template and a preparation method thereof. Background technique [0002] Direct methanol fuel cells are considered to be one of the most promising technologies in the field of mobile and portable power supplies. Direct methanol fuel cells use methanol solution as fuel, and the fuel does not have the problem of storage and transportation difficulties, but methanol has low reactivity and is very easy to poison the catalyst, resulting in low battery performance. [0003] The electrochemical oxidation of methanol over platinum catalysts consists of several elementary reactions: [0004] [00...

AI Technical Summary

Problems solved by technology

However, these methods are only suitable for the preparation of a specific type of metal single atom, and it is difficult to expand into a universal method

So far, the preparation of single-atom platinum catalysts is still a big challenge, mainly because the high surface energy of single-atom platinum makes it easy to aggregate into nanoparticles.

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