Unique Electrochemical Adsorption Properties of Pt‐Skin Surfaces

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. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.