Platinum icosahedron nano crystal catalyst, its preparing method and use

Abstract

The invention relates to a platinum icositetrahedron nm crystal catalyst and preparation method and application, relates to a nm catalyst and preparation method.It supplies a platinum icositetrahedron nm crystal catalyst and preparation method and application in fuel cells, electrochemical synthesis. It is a platinum nm crystal catalyst, with icositetrahedron; its surface is composed of high index crystal face structure of index (210)-(410). In preparation, first prepared the platinum nm particle by electrodeposit method; and treated the square wave potentials of the platinum nm particle on the basement: used the basement of electrodeposition platinum nm particles as a working electrode, working electrode and reference electrode add to the sulfuric acid solution containing additives, imposed square potential on the two electrodes, upper limit electric potential is 0.90 to 1.30V, the minimum potential is -0.30 to10V, the frequency is 1Hz to 1KHz, obtained the grain size of 5-300nm of the platinum icositetrahedron nm crystal catalyst.

Description

technical field [0001] The invention relates to a nano-catalyst and a preparation method thereof, in particular to a platinum tetrahedron nano-crystal catalyst and a preparation method thereof, and its application in important fields such as fuel cells and electrosynthesis. Background technique [0002] Platinum nanomaterials are widely used catalysts in important fields such as fuel cells and electrosynthesis, and have been intensively studied in the past 20 years. Further improving the performance and utilization efficiency of platinum nanocatalysts is a key issue in this field. Improving the activity of nanocatalysts can be achieved by adjusting its composition, and more importantly, changing the shape of catalyst nanoparticles, that is, controlling the arrangement of surface atoms (see literature: Nano Lett., 2004, 4: 1343-1348; Electrochem.Commun. , 2004, 6: 1080-1084). [0003] The shape of the platinum nanoparticle in the existing platinum nanocrystal catalyst is ma...

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Problems solved by technology

But, because in the catalyst preparation process, the growth rate of the high-index crystal plane is much faster than the low-index crystal plane and tends to disappear, so the general chemical synthesis method cannot prepare the nanocrystal of the high-index crystal plane structure (referring to literature: Crystal growth, 1951, New York: Wiley)

So far, there has never been a report on metal tetrahedral nanocrystals

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