Nano porous gold-loaded ultrathin platinum metallic film catalyst and preparation method thereof

Abstract

The invention discloses a nanoporous gold supported ultrathin platinum metal film catalyst; the catalyst is an alloy sheet which is 0.1 - 100 micrometer thick, 0.1 - 10cm wide, and 0.1 - 20cm long, and is uniformly covered with a platinum metal atom layer on the surface thereof; the invention takes the method of under-potential depositing copper, silver or lead on the nanoporous gold and then performing exchange with the platinum metal cations to deposit the platinum metal film on the surface of the porous gold, thus obtaining the nanoporous gold supported ultrathin platinum metal film catalyst. The catalyst material prepared by the method of the invention can be easily controlled with regards to the aperture size, pore wall thickness and the platinum metal film thickness; and the catalyst is characterized by high specific surface area, high utilization ratio of the platinum metal, good catalytic activity and high anti-poisoning property.

Description

Nanoporous gold-supported ultra-thin platinum-group metal film catalyst and preparation method thereof technical field The invention relates to a nanoporous composite metal catalyst with low noble metal loading which can be used for electrocatalytic oxidation of small organic molecules (methanol, formic acid, ethanol, etc.), electrocatalytic reduction of oxygen, oxidation of hydrogen, catalytic hydrogenation and the like. The preparation method particularly relates to a nanoporous gold-supported ultra-thin platinum group metal (alloy) film catalyst and a preparation method thereof. Background technique Fuel cell is a new type of clean energy, which can directly and efficiently convert the chemical energy of hydrogen, methanol, formic acid, ethanol and other fuels into electrical energy, and has the advantages of high fuel utilization rate, high energy density, clean and pollution-free. However, there are two bottlenecks in its widespread use, one is that the activity of th...

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Problems solved by technology

After searching, there is no report on the preparation of ultra-thin platinum-group metal (alloy) films on porous gold using underpotential deposited metals as sacrificial templates.

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