Preparation method of NiCu film supported nano-Pt composite catalyst for electrooxidation of ethanol

Abstract

The invention discloses a preparation method of a NiCu film supported nano-Pt composite catalyst for electrooxidation of ethanol. The preparation method comprises the following steps: Cu salt and Ni salt are dissolved in water in a mole ratio being (0.01-11):1, and a NiCu bimetallic film is prepared with a constant-potential electrochemical co-deposition method; a chloroplatinic acid solution with the concentration of 1-10 g / L is added dropwise to the NiCu bimetallic film, then a mixed alkaline solution containing a reducing agent with the concentration of 0.005-0.5 mol / L and a stabilizer with the concentration of 0.01-0.5 mol / L is added dropwise, precious metal Pt is supported on the NiCu bimetallic film with a chemical reduction method, and the NiCu film supported nano-Pt composite catalyst for electrooxidation of ethanol is prepared. Oxides or / and hydroxides such as NiOOH and CuO produced by Ni and Cu in an ethanol electrooxidation process are beneficial to further oxidation of intermediate products generated in the ethanol oxidation process, and precious metal poisoning is reduced; the precious metal Pt is less supported and highly dispersed, so that activity is exerted sufficiently, and dosage of the precious metal is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts for electrocatalysis, and belongs to the research field of small molecule fuel cells, in particular to a preparation method of a NiCu film-loaded nano-Pt electro-oxidation ethanol composite catalyst. Background technique [0002] Ethanol is a kind of renewable energy, which has an ideal application prospect in organic small molecule fuel cells, and the direct ethanol fuel cell (DEFC) has come out. In the direct ethanol fuel cell, the catalyst is an important factor. At present, the main catalyst used is the noble metal catalyst. The noble metal catalyst such as platinum-based catalyst is used in the process of ethanol electro-oxidation, and it is easy to produce CO intermediate products to poison the platinum-based catalyst. Greatly reduce; At the same time, the price of precious metals is high, which is not conducive to industrial promotion and use. The contact between the metals of the multi-...

AI Technical Summary

Problems solved by technology

In addition, there has never been a composite catalyst for the electro-oxidation of ethanol prepared by combining the electrochemical deposition method with the chemical reduction method. Different preparation methods will cause large differences in the specific surface area and surface chemical properties of the composite catalyst, which will affect the catalytic activity of the catalyst.

[0003] The Chinese patent with the application number 201610025501.4 discloses "a preparation method of Pt / Cu-Ni catalyst and its catalytic oxidation method and application of alcohols". The patent uses two electrochemical deposition methods to prepare a Pt / NiCu composite catalyst. Firstly, the electrochemical deposition method is used to deposit Cu-Ni bimetallic alloy on the surface of the ITO working electrode, and the electrode is cleaned; then the ITO conductive glass deposited with Cu-Ni bimetallic alloy is used as the working electrode, and the electrochemical deposition method is used again. , to obtain a working electrode deposited with Pt / Cu-Ni products, then wash the working electrode, dry, and collect the product on the surface to obtain a Pt / Cu-Ni composite catalyst. In this patent, the electrochemical deposition method is required to support Pt when loading Pt , requires additional consumption of electrochemical energy and requires other devices such as electrolyzers, and the operation process is more complicated

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