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Unique Electrochemical Adsorption Properties of Pt-Skin Surfaces


  • This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract No. DE-AC02-06CH11357.


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Thin skin: Pt-alloy catalysts, such as annealed Pt3Ni(111) (see STM image; color changes mark a single atomic step), with a surface layer of pure platinum, termed a Pt-skin surface, have very different electrochemical adsorption properties to monometallic Pt. The adsorption of hydrogen is largely suppressed (see CV, (—) Pt3Ni(111)-skin versus (••••) Pt(111)), making it hard to determine the electrochemically active surface area of catalysts with Pt-skin surfaces.