Ti/W/Mo oxide in-situ reinforced platinum/palladium nanostructured composite catalyst and preparation method thereof

Abstract

The invention discloses a Ti / W / Mo oxide in-situ reinforced platinum / palladium nanostructured composite catalyst and a preparation method thereof and belongs to the technical field of material science and the field of electro-catalysis. According to the catalyst, an Al-Ti / W / Mo-platinum (palladium) alloy film is obtained with a magnetron sputtering process, the alloy film is soaked in an alkaline solution or an oxygen-rich acid solution or washed with the alkaline solution or the oxygen-rich acid solution, aluminum is selectively corroded, platinum (palladium) atoms and Ti / W / Mo atoms are released, the Ti / W / Mo atoms exposed on a selective corrosion reaction interface are in a complete activated state and are directly combined with oxygen species in a corrosion solution, nano-oxide is formed and performs combination, inlaying and adhesion with precious metal platinum (palladium) on the reaction interface in an in-situ state, and finally, an oxide in-situ reinforced precious metal nano-composite-structure catalyst is formed. According to the catalyst and the preparation method, the operation is simple, industrial production is easy, the cost is saved, the preparation process is environmental-friendly, the oxide and precious metal are closely combined, and the catalyst is an ideal catalyst for anode electrical oxidation reaction of direct alcohol or formic acid fuel cells.

Description

technical field [0001] The invention relates to a Ti / W / Mo oxide in-situ reinforced platinum / palladium nanostructure composite catalyst and a preparation method thereof, which can be used in the electrocatalytic oxidation reaction of formic acid, methanol, ethanol and other liquid fuels, and belongs to the field of material science and technology and electrocatalysis field. Background technique [0002] The fuel cell system is a power generation device that directly converts the chemical energy of the fuel into electrical energy by means of an electrochemical reaction. Because it does not go through the heat engine process and is not limited by the Carnot cycle, the energy conversion efficiency is high, the environment is friendly, and almost no emissions Nitrogen oxides and sulfur oxides, carbon dioxide emissions are also greatly reduced, known as "green energy". Among them, the anode electrocatalyst is one of the key materials that determine the performance, life and cost ...

AI Technical Summary

Problems solved by technology

At present, the preparation of transition metal oxide-enhanced noble metal catalysts mainly adopts the chemical reduction method. First, transition metal nanoparticles are obtained in ethylene glycol solution through strong reducing agents (such as sodium borohydride, hydrazine, etc.), and then the transition metal nanoparticles are made by high-temperature heat treatment. Transform into oxide nanoparticles, and then use it as a carrier to reduce noble metal salts (such as chloroplatinic acid, potassium chloroplatinate, ammonium chloroplatinate, chloropalladium acid, etc.) The oxide / platinum (palladium) composite catalyst is formed on the surface of the oxide carrier. Obviously, the traditional preparation method has complicated steps, and a large amount of precious metal salts, strong reducing agents, and organic solvents are involved. The cost is high and the damage to the environment is relatively large.

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