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četvrtak, 25.11.2010.

Fuel cells and AuPt catalyst

Fuel cells and AuPt catalyst

Committed to fuel cell technology, efficient catalyst for innovation and advanced AuPt debut

Hitachi Maxell has developed a particle diameter of 2 ~ 3nm, and Pt (platinum) could result in unit area compared to about 4.8 times the current AuPt redox catalyst synthesis. At present, the solid polymer fuel cell air electrode (cathode) redox catalyst used generally to use more to carry on the carbon support on Pt catalyst.

Reduce the Pt particle size and increased surface area will help improve the catalytic activity, also add in the Pt Fe, Co and Ni and other metal elements can also enhance the redox activity. However, the problem is near the electrodes for fuel cells was strongly acidic, Fe and other metals dissolved in acid reaction in the power generation process prone to be dissolved away.

The Hitachi Maxell has developed a will not easily soluble in acid Pt Au added to the material. Difficult to form the alloy Au and Pt. Easy to grow into larger Au particles with the characteristics of hard synthetic particle diameter less than 5nm. The citric acid as a reducing agent, the temperature at 100  to the formation of Au and Pt AuPt alloy, developed only 2 ~ 3nm particle diameter of the catalyst. X-ray refraction analysis, confirmed that Au and Pt alloy structure is incomplete.

It is reported that the development of AuPt catalyst with Pt catalyst, in the standard hydrogen potential of 0.6V, the unit area was about 4.8 times the redox current. Hitachi Maxell that, Au and Pt alloy of incomplete structures and particles helps to achieve high activity.

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