Coating type nano-palladium film catalytic electrode and its preparation method

Abstract

The invention discloses a coating type nano-palladium film catalytic electrode and its manufacturing method. The catalytic electrode is a metallic cobalt sheet with a diameter of 6-100mm, a height of 1-10mm and purity over 99wt.%. The upper surface of the cobalt sheet is coated with?10-100at.% metal palladium. The catalytic electrode provided in the invention adopts a pure palladium wire or palladium sheet as a source electrode, which is deposited on a cobalt substrate by an electrospark discharge cladding method, thus forming the catalytic electrode with the surface palladium film and the cobalt substrate firmly combined. The catalytic electrode prepared by the method disclosed in the invention has the advantages of good combination of the film and the substrate, high specific surface area, high noble metal utilization rate, good catalytic activity, high anti-poisoning performance, and simple process, thus being suitable for mass production of catalytic electrodes for fuel cells.

Description

technical field [0001] The invention relates to a coated nano-palladium thin film catalytic electrode which can be used for electrocatalytic oxidation of small organic molecules (methanol, ethanol, formic acid, etc.), catalytic hydrogenation and other reactions, and a preparation method thereof, in particular to a cobalt substrate surface coating Nano palladium thin film catalytic electrode covered with low palladium loading and its preparation method. Background technique [0002] Fuel cell is a new type of clean energy, which can directly and efficiently convert the chemical energy of hydrogen, methanol, ethanol, formic acid and other fuels into electrical energy, and has the advantages of high fuel utilization rate, high energy density, clean and pollution-free. The catalyst layer is the core working part of the fuel cell. Fuel molecules undergo oxidation-reduction reactions on the active sites on the catalyst surface, and then generate electrons to be transported in the ...

AI Technical Summary

Problems solved by technology

Platinum group metal salts have high toxicity, and the extensive use of chemical reagents such as reducing agents and surfactants will cause great environmental pollution problems and cause many potential hazards to people's health

At the same time, platinum nanoparticles are easy to agglomerate, leading to instability and activity decline in the working process, and amorphous nano-carbon powder is easy to lose in the electrochemical oxidation environment, resulting in the loss of catalysts and precious metals

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